Patent Grant
7119267
1. Field of the Invention
This invention relates to a portable mixing recorder which enables a user to produce music by inputting an audio signal via a microphone or the like while monitoring a recorded audio signal, and mixing the input audio signal and the recorded audio signal, as well as to a method and a program for controlling the portable mixing recorder.
2. Description of the Related Art
In recent years, musical apparatuses with enhanced portability have been realized due to the advance of the audio compression technique and the miniaturization technique of electronic components. For example, a portable MP3 player employs the audio compression technique of MP3 (MPEG-1 Audio Layer-III), and reproduces audio signals encoded in the MP3 format. In the MP3 player, a WAV file obtained by digitally sampling an audio signal from the performance of a musical piece and/or the singing of a song is encoded in the MP3 format, and the resulting file compressed in the MP3 format is stored in a flash memory or the like. This enables the user to enjoy the reproduction of the recorded musical piece and/or song, away from home, e.g. outdoors, by using the portable MP3 player. Further, a portable karaoke apparatus is disclosed e.g. in Japanese Laid-Open Patent Publication (Kokai) No. 2000-338984 is capable of extending and reproducing an audio signal file encoded and stored in the MP3 format, and at the same time mixing an audio signal of a human voice input via a microphone with the reproduced audio signal, for audio reproduction, thereby enabling users to enjoy a desired karaoke performance away from home.
These apparatuses are all intended for reproduction or playback, and do not record or store audio signals input via a microphone or the like. However, there have been also proposed other types which are capable of recording and storing audio signals. For example, there has been proposed a portable MP3 recorder which is equipped with an analog input terminal, and is capable of performing A/D conversion of an audio signal input via the analog input terminal from a cassette tape recorder, a radio, or the like, and then encoding the resulting digital audio signal in the MP3 format, to store the compressed file as an audio signal file.
However, the portable MP3 recorder is not capable of performing “recording with mixing (overdubbing)” in which a number of input signals are multiplexed. As a musical apparatus capable of mixing, a double radio-cassette player, for example, is known. In the double radio-cassette player, it is possible to reproduce musical tones from one cassette tape, and at the same time mix an audio signal of the reproduced musical tones and an audio signal input via a microphone or an external input terminal, to record the mixed audio signals in the other cassette tape in a multiplexing manner.
In general, when music production e.g. by overdubbing is to be performed away from home, it is necessary for a musical apparatus to have capabilities of recording and mixing sound signals while maintaining the quality of the resulting mixed sound signal. However, the portable MP3 player and the karaoke apparatus are dedicatedly designed for reproduction, and not capable of recording input audio signals, while the portable MP3 recorder is not capable of mixing. Therefore, none of them is suitable for music production. Further, in the double radio-cassette player, when the mixing is repeatedly carried out, dubbing of analog signals of musical tones is repeatedly carried out, resulting in seriously degraded sound quality of the resulting audio signal file. Therefore, this apparatus is not suitable for music production, either.
On the other hand, a 4-channel MD multi-channel recorder using an MD (Minidisk) has been proposed (in Japanese Laid-Open Patent Publication (Kokai) No. 8-77757) as an apparatus designed mainly for music production. This multi-channel recorder is capable of recording a line-input signal on an MD after A/D conversion and audio compression. For example, the recorder is capable of overdubbing musical tones of several parts, mixing the musical tones, and then temporarily moving the mixed sound to a free channel (ping-pong recording). If a large number of parts are to be processed, musical tones of still another part can be further recorded in a channel made free by the ping-pong recording. Finally, all the parts can be mixed down in all the four channels.
However, in the above multi-channel recorder, during ping-pong recording, a digital audio signal recorded on the MD is converted to an analog audio signal and then mixed with a line-input signal (analog audio signal), and hence when the ping-pong recording is repeatedly carried out, the sound quality is inevitably degraded. Further, the multi-channel recorder is a stationary type which is not suitable for use in music production away from home.
Moreover, in the above multi-channel recorder, whether a line-input audio signal may be recorded in a single channel of an MD or whether audio signals recorded in a plurality of channels of the MD may be mixed and recorded in another channel by ping-pong recording, a recording instruction is given using a single recording key.
However, when the single recording key is used for issuing both an instruction for normal recording (i.e. recording of a line-input audio signal in a single channel) and the instruction for ping-pong recording, a user cannot visually distinguish the two instructions from each other and the user hesitates in determination as to what operation to do next.
Further, as shown in
However, when a performance signal to be overdubbed is captured via line input by collecting, via a microphone, performance tones generated by a user playing a musical instrument, the microphone can pick up undesired tones or noise other than the performance tones, so that the user has to be very careful so as not to make noise while waiting to play the instrument, which causes the user to lose concentration on the performance.
It is an object of the present invention to provide a portable mixing recorder which enables a user to readily produce music using overdubbing and/or other recording techniques while suppressing degradation of sound quality to the minimum without excessive concern for space restriction, as well as a method and a program for controlling the portable mixing recorder.
To attain the above object, in a first aspect of the invention, there is provided a portable mixing recorder comprising an input and conversion device that receives an analog audio signal and converts the analog audio signal to a first digital audio signal;
a decoding device that reads out a compressed audio signal from an original source file stored in a predetermined memory and having the compressed audio signal recorded therein, and then extends the compressed audio signal into a second digital audio signal, a mixing device that mixes the first digital audio signal and the second digital audio signal into a third digital audio signal, a first encoding device that compresses the third digital audio signal into a compressed audio signal, and a storage control device that causes the compressed audio signal obtained by the first encoding device to be stored in the predetermined memory, as a new source file.
According to this portable mixing recorder, an input analog audio signal is converted to the first digital audio signal, while an original source file having a compressed audio signal recorded therein and stored in the predetermined memory is read out and extended to the second audio signal. Then, the first digital audio signal and the second audio signal are mixed into the third digital audio signal, which is compressed to a compressed audio signal, and then stored as a new source file in the predetermined memory. Thus, the audio signal input as an analog signal and the original source file are converted to the digital audio signals and then mixed, and the mixed digital audio signal (third digital audio signal) thus obtained is stored as the new source file which can be utilized as an original source file on the next occasion of recording. Therefore, by repeatedly carrying out overdubbing, it is possible to complete a musical piece formed of a number of multiplexed audio signals. Further, since the mixing is performed using digitalized audio signals, even if the overdubbing is repeatedly carried out, the sound quality is only slightly degraded by compression and extension of the audio signals, and hence degradation of sound quality as a whole can be suppressed. In addition, since the mixed digital audio signal (third digital audio signal) is stored after being compressed to a compressed audio signal, the memory capacity of the recorder can be reduced, which contributes to improvement of the portability of the recorder. Thus, the present portable mixing recorder enables the user to readily produce music by using the overdubbing and other techniques while suppressing degradation of sound quality to the minimum without excessive concern for space restriction.
Preferably, the portable mixing recorder further comprises an undo buffer, and when causing the new source file to be stored in the predetermined memory, the storage control device causes the original source file to be temporarily stored in the undo buffer and causes the original source file to be deleted from the predetermined memory.
According to this referred embodiment, when a new source file is stored in the predetermined memory, the original source file is temporarily stored in the undo buffer. As a result, for example, when the recording with mixing is unsuccessful or the recorded sound is not satisfactory, it is possible to readily retry the recording with mixing by using the original source file temporarily stored in the undo buffer, which enhances the operability of the recorder.
Preferably, the portable mixing recorder further comprises a second encoding device that compresses the first digital audio signal into a compressed audio signal, and when causing the new source file to be stored in the predetermined memory, the storage control device causes the compressed audio signal obtained by the second encoding device to be stored in the predetermined memory, as a separate file different from the new source file.
According to this preferred embodiment, when a new source file is stored in the predetermined memory, a compressed audio signal obtained by compressing the first digital audio signal is recorded in a separate file different from the new file. As a result, for example, when the final result of mixing performed by repetition of overdubbing is not pleasing, the separate file having the first digital audio signal recorded therein can be processed afterward by using a personal computer or the like. Thus, it is possible to make use of the separate file afterward, which improves the operability of the recorder in music production.
Preferably, the portable mixing recorder further comprises a display device that displays predetermined information indicating that the new source file is stored in the predetermined memory when the storage control device causes the new source file to be stored in the predetermined memory.
According to this preferred embodiment, it is possible to easily confirm that the recording with mixing has been started or being performed, which enhances the operability of the recorder.
Preferably, the portable mixing recorder further comprises a connection device that connects at least one other portable mixing recorder as a slave recorder to the portable mixing recorder in cascade, and a slave input device that receives from the slave recorder connected in cascade by the connection device a slave-side input digital audio signal obtained by converting an analog audio signal input to the slave recorder to a digital audio signal, and the mixing device mixes the first digital audio signal, the second digital audio signal, and the slave-side input digital audio signal received by the slave input device.
According to this preferred embodiment, the portable mixing recorder and at least one other portable mixing recorder as a slave recorder are connected in cascade, and a slave-side input digital audio signal converted from an analog audio signal input to the slave recorder is received from the slave recorder. The first digital audio signal, the second digital audio signal, and the slave-side input digital audio signal are mixed together. In short, by connecting the portable mixing recorder to another portable mixing recorder as a slave recorder in cascade, it is possible to mix not only the first digital audio signal and the second digital audio signal, but also the slave-side input digital audio signal received from the slave recorder. Therefore, it is possible to increase the number of input signals which can be mixed down at a time, by the number of slave recorders, thereby enhancing the efficiency in music production.
To attain the above object, in a second aspect of the invention, there is provided a portable mixing recorder comprising a memory that stores files having recorded therein respective compressed digital audio signals, including a source file having a compressed digital audio signal recorded therein, an input and conversion device that receives an analog audio signal and converts the analog audio signal to a first digital audio signal, a first level adjustment device that adjusts a level of the first digital audio signal, a decoding device that reads out the compressed audio signal from the source file, and extends the compressed audio signal into a second digital audio signal, a second level adjustment device that adjusts a level of the second digital audio signal, a mixing device that mixes the first digital audio signal subjected to the level adjustment by the first level adjustment device and the second digital audio signal subjected to the level adjustment by the second level adjustment device into a third digital audio signal, an encoding device that compresses the third digital audio signal into a compressed audio signal, and a storage control device that causes the compressed audio signal obtained by the encoding device to be stored in the memory.
According to this portable mixing recorder, although the recorder is configured to be a portable type which mixes only the first digital audio signal converted from one input analog (stereo) audio signal and the second digital audio signal obtained by extending one compressed digital (stereo) audio signal recorded in a source file, it is possible, e.g. by repeating overdubbing, to mix a desired number of input sources to produce music. Further, the first level adjustment device for adjusting the level of the first digital audio signal converted from one input analog (stereo) audio signal and the second level adjustment device for adjusting the level of the second digital audio signal obtained by extending one compressed digital (stereo) audio signal recorded in a source file are provided separately such that that each device can perform level adjustment independently. Therefore, it is possible to adjust the level of each input source separately with minimal construction, which enables recording with mixing to be performed with an enhanced degree of freedom. Further, since digital signals are compressed and extended, it is possible to save the storage capacity of the memory while suppressing degradation of sound quality.
Preferably, when causing the compressed audio signal to be stored in the memory, the storage control device causes the compressed audio signal to be substantially overwritten to the source file.
According to this preferred embodiment, whenever overdubbing is performed, the compressed audio signal to be substantially overwritten to the original source file, and therefore, a user need not take the trouble of deleting the original source file. In addition, since source files are not increased in number, the storage capacity of the memory can be saved.
Preferably, the portable mixing recorder comprises an undo buffer, and when causing the compressed audio signal to be stored in the memory, the storage control device causes the source file to be temporarily stored in the undo buffer and causes the source file to be deleted from the memory.
According to this preferred embodiment, when causing the compressed audio signal to be stored in the memory, the storage control device causes the source file to be temporarily stored in the undo buffer and causes the source file to be deleted from the memory. Therefore, for example, when the recording with mixing is unsuccessful or the recorded sound is not satisfactory, it is possible to readily retry the recording with mixing by using the source file temporarily stored in the undo buffer, which enhances the operability of the recorder.
To attain the above object, in a third aspect of the invention, there is provided a portable mixing recorder comprising a memory that stores files having recorded therein respective compressed digital audio signals, including a source file having a compressed digital audio signal recorded therein, an input and conversion device that receives an analog audio signal and converts the analog audio signal to a first digital audio signal, a first effect applying device that applies a first kind of effect to the first digital audio signal, a decoding device that reads out the compressed audio signal from the source file, and extends the compressed audio signal into a second digital audio signal, a mixing device that mixes the first digital audio signal having the first kind of effect applied thereto by the first effect applying device and the second digital audio signal into a third digital audio signal, a second effect applying device that applies a second kind of effect different from the first kind of effect to the third digital audio signal, and an output device that outputs the third digital audio signal having the second kind of effect applied thereto by the second effect applying device, from the recorder.
According to this portable mixing recorder, an effect of a type which is not spoiled by repetition of overdubbing or the like is applied or added by the first effect applying device, and an effect, such as reverberation, of a type which is spoiled by repetition of overdubbing or the like is applied by the second effect applying device. In other words, an effect of the former type is overdubbed a plurality of times, whereas an effect of the latter type is added to an audio signal only once immediately before the audio signal is output. Therefore, the portable mixing recorder of the present aspect is capable of maintaining excellent sound quality with the minimal construction.
To attain the above object, in a fourth aspect of the invention, there is provided a portable mixing recorder comprising an input and conversion device that receives an analog audio signal and converts the analog audio signal to a first digital audio signal, a reproduction device that reproduces a second digital audio signal from a source file stored in a predetermined memory, a recording instruction device that is operatable to instruct recording of the first digital audio signal in the predetermined memory, a recording-with-mixing instruction device that is operatable to instruct mixing of the first digital audio signal and the second digital audio signal into a third digital audio signal, and recording of the third digital audio signal in the predetermined memory, and a control device that causes the first digital audio signal to be stored in the memory when the recording instruction device is operated by a user, and causes the first digital audio signal and the second digital audio signal to be mixed into a third digital audio signal, and the third digital audio signal to be stored in the memory when the recording-with-mixing instruction device is operated by the user.
According to this portable mixing recorder, when the recording instruction device is operated by the user, the first digital audio signal formed by the input and conversion device that receives an analog audio signal and converts the analog audio signal to the first digital audio signal is stored in the memory, while when the recording-with-mixing instruction device is operated by the user, the first digital audio signal and the second digital audio signal reproduced from a source file stored in the memory by the reproduction device are mixed and stored in the memory. Thus, the recording instruction device that is operated for instructing recording of the first digital audio signal in the memory, and the recording-with-mixing instruction device that is operated for instructing mixing of the first digital audio signal and the second digital audio signal into the third digital audio signal and instructing storing of the third digital audio signal in the memory are provided as separate devices. Therefore, the user can select a desired one of the recording and the recording with mixing simply by operating the corresponding recording device, with ease. This prevents the user from hesitating in operation for instructing recording, thereby enhancing the operability of the recorder.
Preferably, the source file has a compressed digital audio signal recorded therein, and the reproduction device reproduces the second digital audio signal by reading out the compressed digital audio signal from the source file and extending the compressed digital audio signal, and when the first digital audio signal is to be stored in the memory, the control device causes the first digital audio signal to be compressed and then stored in the memory, while when the third digital audio signal is to be stored in the memory, the control device causes the third digital audio signal to be compressed and then stored in the memory.
According to this preferred embodiment, since the mixed digital audio signal is stored after having been compressed to a compressed digital audio signal, the capacity of the memory can be reduced, which contributes to improvement of portability of the recorder. Thus, the present embodiment makes it possible to produce music by using the overdubbing and other techniques while suppressing degradation of sound quality to the minimum with ease without excessive concern for space restriction.
To attain the above object, in a fifth aspect of the invention, there is provided a portable mixing recorder comprising an input and conversion device that receives an analog audio signal and converts the analog audio signal to a first digital audio signal, a reproduction device that reproduces a second digital audio signal from a source file stored in a predetermined memory, a recording-with-mixing instruction device that is operatable to instruct mixing of the first digital audio signal and the second digital audio signal into a third digital audio signal, and recording of the third digital audio signal in the predetermined memory; in the memory, a temporary stop instruction device that is operatable to instruct the reproduction device to temporarily stop reproduction of the second digital audio signal, and a control device that, when the recording-with-mixing instruction device is operated by a user after the reproduction of the second digital audio signal is temporarily stopped by the temporary stop instruction device, causes the first digital audio signal and the second digital audio signal to be mixed starting from a position where the reproduction was temporarily stopped, and then causes the third digital audio signal to be stored in the memory.
According to this portable mixing recorder, when the recording with mixing instruction device is operated by the user after reproduction of the second digital audio signal is interrupted, mixing of the first digital audio signal and the second digital audio signal reproduced by the reproduction device is started from the position where the reproduction was stopped, and the digital audio signal obtained by the mixing is stored in the memory. In other words, when the user wants to carry out recording with mixing only on a portion of the source file, the other portion of the source file on which the user does not want to carry out the recording with mixing is only reproduced, so that differently from a case where the conventional multi-channel recorder is used, the user is not held in a standby state for the recording with mixing, and no signal other than an audio signal for the recording with mixing can be picked. This enables the user to concentrate on the performance or other necessary operation for the recording with mixing.
Preferably, the source file has a compressed digital audio signal recorded therein, and the reproduction device reproduces the second digital audio signal by reading out the compressed digital audio signal from the source file and extending the compressed digital audio signal, and wherein the control device causes the third digital audio signal to be compressed and then stored in the memory.
According to this preferred embodiment, since the mixed digital audio signal is stored after having been compressed to a compressed digital audio signal, the capacity of the memory can be reduced, which contributes to improvement of the portability of the recorder. Thus, the present embodiment makes it possible to produce music by using the overdubbing and other techniques while suppressing degradation of sound quality to the minimum with ease without excessive concern for space restriction.
To attain the above object, in a sixth aspect of the present invention, there is provided a control method of controlling a portable mixing recorder, comprising the steps of converting an input analog audio signal to a first digital audio signal, reading out a compressed audio signal from an original source file stored in a predetermined memory and having the compressed audio signal recorded therein, and then extending the compressed audio signal into a second digital audio signal, mixing the first digital audio signal and the second digital audio signal into a third digital audio signal, compressing the third digital audio signal into a compressed audio signal, and causing the compressed audio signal obtained by the step of compressing the third digital audio signal to be stored in the predetermined memory, as a new source file.
According to this control method, the same effects as those obtained by the portable mixing recorder according to the first aspect can be obtained.
To attain the above object, in a seventh aspect of the present invention, there is provided a control method of controlling a portable mixing recorder, comprising the steps of converting an input analog audio signal to a first digital audio signal, adjusting a level of the first digital audio signal, reading out the compressed digital audio signal from a memory storing files having recorded therein respective compressed digital audio signals, including a source file having a compressed digital audio signal recorded therein, and then extending the compressed digital audio signal into a second digital audio signal, adjusting a level of the second digital audio signal, mixing the first digital audio signal subjected to the level adjustment by the step of adjusting the level of the first digital audio signal and the second digital audio signal subjected to the level adjustment by the step of adjusting the level of the second digital audio signal into a third digital audio signal, compressing the third digital audio signal into a compressed audio signal, and causing the compressed audio signal obtained by the step of compressing the third digital audio signal to be stored in the predetermined memory.
According to this control method, the same effects as those obtained by the portable mixing recorder according to the second aspect can be obtained.
To attain the above object, in an eighth aspect of the present invention, there is provided a control method of controlling a portable mixing recorder, comprising the steps of converting an input analog audio signal to a first digital audio signal, applying a first kind of effect to the first digital audio signal, reading out the compressed digital audio signal from a memory storing files having recorded therein respective compressed digital audio signals, including a source file having a compressed digital audio signal recorded therein, and then extending the compressed digital audio signal into a second digital audio signal, mixing the first digital audio signal having the first kind of effect applied thereto by the step of imparting the first kind of effect and the second digital audio signal into a third digital audio signal, applying a second kind of effect different from the first kind of effect to the third digital audio signal, and outputting the third digital audio signal having the second kind of effect applied thereto by the step of imparting the second kind of effect, from the recorder.
According to this control method, the same effects as those obtained by the portable mixing recorder according to the third aspect can be obtained.
To attain the above object, in a ninth aspect of the present invention, there is provided a control method of controlling a portable mixing recorder, comprising the steps of converting an input analog audio signal to a first digital audio signal, reproducing a second digital audio signal from a source file stored in a predetermined memory, and causing the first digital audio signal to be stored in the memory when a recording instruction device is operated by a user, causing the first digital audio signal and the second digital audio signal to be mixed into a third digital audio signal when a recording-with-mixing instruction device is operated by the user, and then causing the third digital audio signal to be stored in the predetermined memory.
According to this control method, the same effects as those obtained by the portable mixing recorder according to the fourth aspect can be obtained.
To attain the above object, in a tenth aspect of the present invention, there is provided a control method of controlling a portable mixing recorder, comprising the steps of converting an input analog audio signal to a first digital audio signal, reproducing a second digital audio signal from a source file stored in a predetermined memory, and causing the first digital audio signal and the second digital audio signal file to be mixed into a third digital audio signal when a recording-with-mixing instruction device is operated by a user after reproduction of the second digital audio signal is temporarily stopped by a temporary stop instruction device, starting from a position where the reproduction was temporarily stopped, and then causing the third digital audio signal to be stored in the predetermined memory.
According to this control method, the same effects as those obtained by the portable mixing recorder according to the fifth aspect can be obtained.
Further, to attain the above object, there are provided programs for causing a computer to execute the control methods according to the sixth to tenth aspects, respectively, to obtain the same effects as obtained by the portable mixing recorder according to the fifth to tenth aspects.
The above and other objects, features, and advantages of the invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings.
The present invention will now be described in detail with reference to the drawings showing an embodiment thereof.
Referring first to
As shown in
As shown in
A display 61 is formed by a liquid crystal display. On the display 61 are displayed various information items, such as the name of a musical piece, the time of day, a playing time, a mode, configuration (settings) information, etc. A disp/sys switch 62 is used for switching the display mode of the display 61, and switching between system configuration screen views for copying or deleting a musical piece, changing the name of a musical piece, and so forth. A rep switch 63 is used for executing repetitive reproduction of musical tones. An EQ switch 64 and a rev switch 65 are used for selection of an output ambient condition, e.g. for equalization of an output voice and impartment of reverberation to the same.
A mic switch 66, an inst switch 67, and an aux switch 68 are each used for selection of an input audio signal path, i.e. for input selection. A selected one of the switches lights up. On the other hand, as shown in
An input level (input) adjuster 69 is used for adjusting the input level of an audio signal externally input, while an output level (song) adjuster 70 is used for adjusting the reproduction level of an audio signal reproduced from a source file 11 stored in a memory card 10, described in detail hereinafter.
An LED level meter 71 is comprised of a plurality of LED's, each of which lights up or blinks to indicate an input level, a reproduction level, a recording level, and so forth. A reproduction/recording (play/stop/ent) button 72 is not only used for starting and stopping reproduction and recording, but also used as a determination key for determining various configurations. An eff button 73 is used for applying effects, such as delay, to input audio signals. A met button 74 is used for setting and turning on/off of a metronome function. A tnr button 75 is used for utilizing a tuner function and a tone generator function. In an input mode, the LED level meter 71 blinks according to the pitch of an input audio signal, whereas in a tone mode, a reference tone of a preset musical interval is sounded.
A rec button 76 is used for digital recording of an input audio signal. When the rec button 76 is depressed, the recorder 20 is placed in a recording standby state, and then when the reproduction/recording button 72 is depressed, the recording is started. A mix button 77 is used for carrying out digital recording with mixing of an input audio signal and an audio signal reproduced from the source file 11. When the mix button 77 is depressed, the recorder 20 is placed in a recording-with-mixing standby state, and then when the reproduction/recording button 72 is depressed, the recording with mixing is started. A pause button 78 is used for temporarily stopping the reproduction. It should be noted that each of the buttons 73 to 76 incorporates an LED, not shown, which lights up when the button is depressed.
A plus (+) button 79 and a minus (−) button 80 are used for selection of a musical piece (hereinafter referred to as “a song”) in the source file 11. The name of a song selected by the plus or minus button 79(80) is shown on the display 61. When the name of a desired song is displayed, the reproduction/recording button 72 is depressed, whereby the selection of the song is determined. It should be noted that when the user has not named a song, a name (serial number or the like) is automatically added to the song when the song is recorded in the source file 11. An undo button 87 is used for canceling an immediately preceding memory access process and restoring an original state.
Referring to
An input select section 25 (part of the input and conversion device) selects an analog audio signal to be input or received, from signals from the pair of internal microphones 59, 60, the inst terminal 84, the external microphone terminal 85 and the aux terminal 86. The analog audio signal delivered from the input select section 25 is converted to a digital audio signal by an A/D converter section 26 (part of the input and conversion device). Then, the digital audio signal is equalized by an EQ (equalizer) 27, subjected to a consonant suppressing process by a DYN (dynamic effector) 28, and has applied thereto effects, such as reverberation, delay, and flanger, by an EFF (effector) 29.
The signal output from the EFF 29 is subjected to input level adjustment by the input level adjuster 69 and localization by the localizer 53, and then input to an input line (BUSES 1, 2) 33 and a switch section MSW. When two recorders 20 are connected in cascade, one of them is designated as a master by the master designation switch 58, as described hereinbefore, and if the present recorder 20 is designated as the master, the switch section MSW is turned on, whereas if the present recorder 20 is designated as the slave, the switch section MSW is turned off.
The signal input to the input line 33 is input to an encoder (ENCODE) 39 (second encoding device). If the present recorder 20 is the slave, the signal input to the input line 33 is further output via an output line 8 to the master connected to the present recorder 20 in cascade.
The present recorder 20 includes a storage control section 30 (storage control device) and an undo buffer 31. The undo buffer 31 is implemented by a RAM or the like. The undo buffer 31 and the memory card 10 are both connected to the storage control section 30, which controls storage operations of the undo buffer 31 and the memory card 10. The memory card 10 is provided with a USB I/F (interface) 35.
In the recorder 20, the undo buffer 31, the slot 54 and the USB terminal 55 are connected to a CPU 91 via a bus 97. Further, a RAM 92, a ROM 93, an input/output section 94, an operating section 95 and a display section 96 are also connected to the CPU 91 via the bus 97.
The CPU 91 controls the overall operation of the recorder 20. The RAM 92 temporarily stores various kinds of data, and also functions as a work area for the CPU 91. The ROM 93 stores not only various control programs to be executed by the CPU 91, but also various kinds of data.
The input/output section 94 is comprised of a group of elements involved in the input to and output from the present recorder 20, including the cascade terminal 52, the internal microphones 59, 60, the terminals 84 to 86, the internal speaker 57, and the phone terminal 81. The operating section 95 is comprised of a group of elements involved in the input to and operation of the present recorder 20, including the master designation switch 58, the switches 62 to 68, the adjusters 69, 70 and the buttons 72 to 80. The display section 96 is comprised of a group of elements involved in display, including the display 61 and the LED level meter 71.
Referring again to
The source file 11 is an original file to be mixed with an audio signal input e.g. from the internal microphones 59, 60 via the input select section 25. The source file 11 is initially stored as a mixed file 12 by recording an input audio signal without executing a mixing process (this kind of recording will be hereinafter referred to as “simple recording”)(in this case, since no mixing process is carried out, the name of the mixed file does not represent the contents of the file faithfully). It should be noted that there can be a plurality of source files 11. Further, the source file 11 may be obtained by mounting a memory card 11 into another apparatus and storing existing data therein in advance.
The mixed file 12 records a mixed signal formed by mixing an audio signal reproduced from the source file 11 and an audio signal input via the input select section 25 (this kind of recording is referred to as “recording with mixing” throughout the specification). The mixed file 12 can be used as a new source file 11 in place of an original source file 11 on a subsequent occasion.
The material file 13 is formed by recording an audio signal input via the input select section 25 without mixing the same with an audio signal reproduced from the source file 11. The material file 13 is stored as a file (separate file) separate from the mixed file 12. It should be noted that whether or not the material file 13 is to be generated during recording with mixing can be set according to the user's intention.
In recording with mixing, an audio signal from the source file 11 is extended to a digital audio signal by a decoder (DECODE) 37 (decoding device). The digital audio signal is subjected to output level adjustment by the output level adjuster 70, and then input to an output line 34 (mixing device).
When the present recorder 20 is designated as a master, a signal input to the switch section MSW after localization by the localizer 53 is also input to the output line 34. On the other hand, from a slave recorder connected to the master recorder 20 in cascade, a digital audio signal (slave-side input digital audio signal) is input to the output line 34 via a line 36 (part of a slave input device). When a signal is input to the output line 34 from any of the switch section MSW, the slave recorder, and the decoder 37, the signal is delivered to each of an encoder (ENCODE) 38 (first encoding device) and an EFF 40, and at the same time delivered to the slave recorder via an output line 7.
The digital audio signal input to the encoder 38 via the output line 34 is compressed in the MP3 format by the encoder 38, and then stored as a mixed file 12 in the memory card 10. On the other hand, the digital audio signal input to the encoder 39 via the output line 33 is compressed in the MP3 format by the encoder 39, and then stored as a material file 13 in the memory card 10.
When the mixed file 12 is stored by recording with mixing, the original source file 11 is deleted. Accordingly, the process of storing the mixed file 12 appears to be similar to a process of overwriting the source file 11 by a new source file 11. Actually, however, the original source file 11 is temporarily stored in the undo buffer 31, which makes it easy to retry the recording with mixing.
Although the undo buffer 31 is arranged in the body of the recorder 20 in the present embodiment, it may be arranged within the memory card 10. Further, it is preferable that the file stored in the undo buffer 31 is preserved at least until a mixed file 12 is stored on the next occasion.
The digital audio signal input to the EFF 40 from the output line 34 has effects applied thereto by the EFF 40, and is equalized by the EQ 41, and converted to an analog audio signal by the D/A converter section 42. Then, the analog audio signal is subjected to volume setting by the volume controller 82, followed by being output to the phone terminal 81, and also to the internal speaker 57 depending on the case.
As described above, the recorder 20 is capable of performing digital recording of an input audio signal and real-time reproduction of the same, digital recording with mixing of an input audio signal and an audio signal (of a song) reproduced from the source file 11 and real-time reproduction of the mixed sound, reproduction of the audio signal from the source file 11, and so forth.
The recorder 20 is further provided with a tuner 45 and a tuner/metronome 44. In the above-mentioned input mode, the tuner 45 detects the pitch of an analog audio signal output from the input select section 25, and causes the LED level meter 71 to indicate the detected pitch. In the above-mentioned tone mode, the reference tone of the preset musical interval is output from the tuner/metronome 44 to the D/A converter section 42. When the metronome function is selected or turned on, a metronome sound is output from the tuner/metronome 44 to the D/A converter section 42. The reference tone or the metronome sound is sounded via the phone terminal 81 or the internal speaker 57.
The LED level meter 71 indicates the input level of input sound, based on a signal having passed through the input level adjuster 69, and also indicates the output level of a song, based on a signal from the source file 11 having passed through the output level adjuster 70. Further, the LED level meter 71 indicates the input level of a signal input to the encoder 38 via the output line 34. The levels of the respective signals may be displayed on the display 61 instead of being indicated by the LED level meter 71.
It should be noted that when the recorder 20 is connected to a personal computer, not shown, via the USB terminal 55, it is possible to gain access to the files within the memory card 10 from the personal computer similarly to a case where an external drive is used by the personal computer, so that the files can be copied, deleted, or moved by operation from the personal computer, and if a software program is provided, even editing or handling of the files can be performed by operation from the personal computer.
Next, the operations of the recorder constructed as above will be described.
First, in simple recording of input sound, as shown in
In reproduction of a song from the source file 11, as shown in
In recording with mixing, as shown in
In recording with mixing carried out while generating a material file 13, as shown in
In recording carried out according to the operation of the metronome, as shown in
In the case of using the tuner function, as shown in
The display 61 displays information according to operating conditions and setting conditions. The examples illustrated in
When simple recording is started, the rec button 76 (see
On the other hand, when recording with mixing is started, the mix button 77 (see
Indications for execution of recording and recording with mixing are not limited to those using the on-recording characters and the on-mix-recording characters, but LED's may be used in place of the characters displayed on the display 61.
Further, although in the present embodiment, the undo function can be used only once, this is not limitative, but the capacity of the undo buffer 31 may be increased so as to make it possible to carry out undo processing a plurality of times.
In the following, an analog audio signal input via the input select section 25 of the master recorder 20A will be referred to as “the signal A”, and an MP3 audio signal recorded in a source file 11 of the master recorder 20A will be referred to as “the signal B”, while an analog audio signal input via the input select section 25 of the slave recorder 20B will be referred to as “the signal C”, and an MP3 audio signal recorded in a source file 11 of the slave recorder 20B will be referred to as “the signal D”. Further, each of these signals will be simply referred to similarly to the above irrespective of whether it is an analog signal or a digital signal.
In the master recorder 20A, first, the signal A and the signal B are input to the mixing section MB. Further, the signal C (slave-side input digital audio signal) output via the output line 8 of the slave recorder 20B is input to the mixing section MB via the cascade terminal 52. In the mixing section MB, a “signal A+B+C” formed as a digital audio signal by mixing the signal A, the signal B, and the signal C is generated. This “signal A+B+C” is output for reproduction via the Eff2 and the D/A converter section 42, and at the same time compressed by the encoder 38 and stored as a mixed file 12 in the memory card 10. Thus, the signal C becomes a signal for mixing, similarly to the signal A, so that signals which can be input simultaneously as analog audio signals are increased in number. Further, the “signal A+B+C” is output from the mixing section MB to the slave recorder 20B via the cascade terminal 52.
On the other hand, in the slave recorder 20B, the “signal A+B+C” input via the cascade terminal 52 and the signal D from the source file 11 are input to the mixing section MB. It should be noted that differently from the signal A, the signal C is not input to the mixing section MB via the Eff1, as described hereinabove, so as to prevent the signal from being looped. In the mixing section MB, a “signal A+B+C+D” formed as a digital audio signal by mixing the “signal A+B+C” and the signal D is generated. This “signal A+B+C+D” is output for reproduction via the Eff2 and the D/A converter section 42, and at the same time compressed by the encoder 38 and stored as a mixed file 12 in the memory card 10.
For accurate reproduction and recording of the “signal A+B+C+D”, it is necessary to execute processing for synchronization of the “signal A+B+C” and the signal D. Therefore, the system may be configured such that in the case of cascade connection, the signal D can be inhibited from being read from the slave recorder 20B so as to cause only the signal A, the signal B and the signal C to be processed. In this case, the same reproduction and recording of the “signal A+B+C” as performed in the master recorder 20A can be performed simultaneously in the slave recorder 20B as well.
Next, processing (button operation processing) executed upon depression of the reproduction/recording button 72, the rec button 76, the mix button 77 or the pause button 78 will be described based on flowcharts shown in
As described hereinbefore, when the reproduction/recording button 72 is operated in a recording standby state, i.e. in a state in which the rec button 76 has been operated, simple recording is started. This simple recording is continuously performed until the reproduction/recording button 72 is operated again (processing 1). When the reproduction/recording button 72 is operated in a recording-with-mixing standby state, i.e. in a state in which the mix button 77 has been operated, the recording with mixing is started. This recording with mixing is continuously performed until the reproduction/recording button 72 is operated again (processing 2). When the reproduction/recording button 72 is operated in a state other than the recording standby state and the recording-with-mixing standby state, a currently selected source file is reproduced. Then, when the pause button 78 is operated during the reproduction of the source file, the reproduction is temporarily stopped (processing 3). When the pause button 78 is operated again in the pause state, the pause state is canceled, and the reproduction state is restored (processing 4), whereas when the mix button 77 is operated in the pause state, the recording with mixing from the temporary stop position is started (processing 5).
The processing 1 described above is realized by steps S1 to S5 in
Referring to
The operation for recording in the mixed file 12 is continued until the reproduction/recording button 72 is depressed again (S3→S4→S3). When the button 72 is depressed, the recording of the signal in the mixed file 12 is terminated, and the mixed file 12 becomes a source file with a new name (S4→S5).
On the other hand, when the reproduction/recording button 72 is depressed, if the mix button 77 is on, i.e. if the recorder is in the recording-with-mixing standby state, as described with reference to
The operation (recording with mixing) for recording the signal in the mixed file 12 is continued until the reproduction/recording button 72 is depressed again (S7→S8→S7). Then, when the button 72 is depressed, the recording of the signal in the mixed file 12 is stopped, and the original source file 11 is temporarily stored in the undo buffer 31. Thereafter, the name of the mixed file 12 is changed to the name of the original source file 11, and the original source file 11 is deleted(S8→S9→S10→S11→S12).
When the reproduction/recording button 72 is depressed, if the recorder is neither in the recording standby state nor in the recording-with-mixing standby state, it is judged that the button 72 was depressed simply for giving an instruction for reproduction, and a currently selected source file 11 is reproduced (S13). Then, after a pause processing subroutine, described in detail hereinafter with reference to
In the figure, when the pause button 78 is depressed, the reproduction is temporarily stopped or interrupted (S21→S22). Thereafter, as long as neither the pause button 78 nor the mix button is depressed, the temporary stop state is maintained (S23→S25→S22).
When the pause button 78 is depressed again in the temporary stop state of the reproduction, the temporary stop state is canceled (S23→S24).
On the other hand, when the mix button 77 is depressed in the temporary stop state of the reproduction, data of the digital audio signal reproduced so far from the source file 11 is recorded in the mixed file 12, and an address pointed by a writing pointer, not shown, for writing a digital audio signal in the mixed file 12 is set to the temporary stop position where the reproduction was interrupted. Then, mixing of the digital input audio signal (obtained by A/D conversion of the analog signal input from the selected input means) and the digital audio signal read from the source file 11 and reproduced is started from the temporary stop position, and the mixed digital signal is recorded in a mixed file 12 stored in the memory card 10 (S25→S26→S27→S28).
The step S28 is repeatedly executed until the reproduction/recording button 72 is depressed. Then, when the button 72 is depressed, the same processing as executed at the steps S9 to S12 is carried out (S30 to S33)
As shown in the figure, first, the reproduction/recording button 72 is depressed to start reproduction of the source file 11. Then, at a time point the reproduction proceeds to a desired position for starting the recording with mixing, the pause button 78 is depressed to stop the reproduction temporarily. Then, if a digital audio signal for the recording with mixing is from a musical instrument, the musical instrument is made ready for performance. When the instruction is ready, the mix button 77 is depressed to start the recording with mixing.
As described above, according to the present embodiment, when recording with mixing is desired to be performed only on a portion of the source file 11, the other portion of the source file 11 on which the user does not want to carry out the recording with mixing is only reproduced, so that as is distinct from the conventional multi-channel recorder, the user is not held in a standby state for the recording with mixing, and no signal other than an audio signal for the recording with mixing can be picked. This enables the user to concentrate on the performance or other necessary operation for the recording with mixing. Further, in the present embodiment, since the two kinds of buttons, i.e. the rec button 76 for designating simple recording and the mix button 77 for designating recording with mixing are provided as separate means, the user can select an intended recording operation (or enter a standby state for the recording operation) simply by depressing a button corresponding to the recording operation. Thus, the user is made free from hesitating in button operation, which enhances the operability of the recorder.
Further, according to the present embodiment, an audio signal input as an analog audio signal and a compressed audio signal recorded in a source file 11 are converted to respective digital audio signals, and mixed with each other, and then the resulting mixed audio signal is compressed to be recorded in a new source file for storage. Moreover, the new source file can be utilized as an original source file on the next occasion of recording, so that by repeatedly carrying out overdubbing as in the case of the multi-channel recorder, it is possible to complete a musical piece formed of a number of multiplexed audio signals. Further, the portability of the present recorder is convenient e.g. when the recorder is required to be carried to specific musical instrument players for mixing. Furthermore, since the mixing is performed with digitalized audio signals, even if overdubbing is repeatedly carried out, sound quality is hardly degraded, and hence the present embodiment is suitable for use in music production. In addition, since the mixed digital audio signal is recorded after being compressed to a compressed audio signal, the memory capacity of the recorder can be reduced, which contributes to improvement of the portability of the recorder. Thus, the present embodiment makes it possible to easily produce music by using the overdubbing and other techniques while suppressing degradation of sound quality to the minimum, away from home, without excessive concern for space restriction.
Further, in the present embodiment, when a mixed file 12 is stored as a new source file, the original source file 11 is temporarily stored in the undo buffer 31, and therefore, for example, when the recording with mixing is not successful or recorded sound is not satisfactory, it is possible to readily retry the recording with mixing by using the original source file 11 temporarily stored in the undo buffer 31, which enhances the operability of the recorder in music production.
Furthermore, in the present embodiment, simultaneously with recording of a mixed file 12, a material file 13 is stored as a file separate from the mixed file 12, and therefore, for example, when the final result of mixing performed by repetition of overdubbing is not pleasing, the material file 13 can be processed afterward by using a personal computer or the like. Thus, it is possible to make use of the material file 13 afterward, which improves the operability of the recorder in music production.
Moreover, since the on-recording-with mixing characters are displayed during recording with mixing, it is possible to visually confirm that the recording with mixing is under way, which further enhances the operability of the recorder.
Further, in the present embodiment, the use of another portable mixing recorder as the slave recorder 20B in cascade connection makes it possible to add an input signal from the slave recorder 20B to audio signals for mixing, and hence it is possible to increase the number of input signals which can be mixed down at a time, thereby enhancing efficiency in music production.
It should be noted that more than two portable mixing recorders may be connected in cascade. In this case, recorders each provided with a master-in terminal and a slave-out terminal in place of the cascade terminal 52 may be connected in series in such a manner that the master-in terminal of one recorder on a superordinate side is connected to the slave-out terminal of another recorder on a subordinate side to thereby define the master-slave relation between them. As a result, the number of input signals which can be mixed down at a time can be increased by the number of slave recorders in the cascade connection.
Although in the present embodiment, audio signals are compressed in the MP3 format, this is not limitative, but other compression formats, such as the Twin VQ (Transform-Domain Weighted Interleave Vector Quantization) and the AFS (Advanced Streaming Format), may be employed.
Further, the memory card 10 may be replaced by another type of removable storage medium, or alternatively, may be replaced by a stationary storage medium provided in the body of the recorder 20.
It is to be understood that that the object of the invention can also be achieved by supplying a control program to the recorder via a storage medium storing the software program for realizing the above described embodiment. In this case, the program code read from the storage medium achieves the novel functions of the present invention, and hence the storage medium storing the program code constitutes the present invention. When the recorder is provided with a communication interface, and the program code is supplied to the recorder via a transmission medium or the like, the program code itself constitutes the present invention. The storage medium used for supplying the program code may be a floppy disk, a hard disk, an optical memory disk, a CD-ROM, a CD-R, a magnetic tape, a nonvolatile memory card, or the like.
Further, it is to be understood that the functions of the illustrated embodiment may be accomplished not only by executing the program code read out by a computer, but also by causing an OS or the like operating on the computer to perform a part of or all of actual operations according to the instructions of the program code. Further, it is to be understood that the functions of the above described embodiment may be accomplished by writing a program code read out from the storage medium into an expansion board inserted into a computer or a memory provided in an expansion unit connected to the computer and then causing a CPU or the like provided in the expansion board or the expansion unit to perform a part or all of the actual operations based on instructions of the program code.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2001-181938 | Jun 2001 | JP | national |
| 2001-265763 | Sep 2001 | JP | national |
| 2001-265764 | Sep 2001 | JP | national |
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| 20020189426 A1 | Dec 2002 | US |
