Patent Application
20050087060
This invention relates to a music tuner to tune music instruments. More particularly, this invention relates to a music tuner to tune music instruments which is able to automatically select a suitable sensing device from either a non-contact sensing device or a contact sensing device to pick-up sounds to be tuned and allows the user to easily see the display of the tuner regardless of a manner that the music tuner is attached to a music instrument, etc.
A tuning device for music instrument (hereafter “music tuner”) is widely used to measure and adjust the pitch of a sound of a music instrument. Basically, a music tuner measures a frequency of a musical sound to allow the user to adjust the sound to a predetermined frequency.
There are primarily two kinds of music tuners widely available in the market in terms of the type of music sound sensing device. One type of the music tuner has a non-contact sensing device, such as a microphone for picking-up the musical sound in a non-contact manner. Another type of music tuner has a contact sensing device such as a piezoelectric device for picking-up the musical sound by physically contacting with the music instrument. As is well known in the art, the piezoelectric device generates an electric signal (voltage) in response to a mechanical stress (vibration) received from the music instrument.
Ordinarily, the music tuner with a non-contact sensing device (hereafter also referred to as “microphone”) is not physically attached to a music instrument. The microphone picks the sound coming from the instrument through the air so that the music tuner can determine the pitch of the sound. The music tuner with a contact sensing device (hereafter also referred to as “piezo device”) is physically attached to a music instrument. The piezo device picks the vibration of the music instrument and converts the vibration to a voltage to determine the pitch of the instrument.
Each type of the music tuner having either a microphone or a piezo device has both advantages and disadvantages. In the music tuner using a piezo device, the user can use the music tuner in a relatively noisy environment. For example, when the user is tuning the instrument in an ensemble, several other players are normally present and playing their music instruments. The sounds from other instruments can diminish the accuracy of the music tuner utilizing a microphone because the microphone of the turner can pick the ambient sounds as well. Such a problem will not occur if the music tuner employs a piezo device.
In the music tuner using a microphone, the user need not directly attach the music tuner to the music instrument. Depending on a type of musical instrument, attaching the music tuner so that a sensing device can detect the sound of the instrument may be difficult or impractical. The user may want to leave the music tuner on a music stand so that she can check the pitch any time. In some cases, the user just prefers to use the microphone because ambient sound is negligible or attaching the music tuner to the music instrument is cumbersome. Moreover, in a conventional music tuner using a piezo device, it may become difficult to read the display of the music tuner when it is attached to a specific location of the music instrument. In some cases, the user is forced to see the display from the opposite direction such that the display is upside-down as viewed from the user.
Accordingly, there is a need of a new music tuner that is able to take advantages of both types of the music tuner, one having a microphone and the other having a piezo device, and is integrated in a user-friendly manner into a single tuner so that the user can enjoy the benefit of both types of music tuners.
The present invention has been made to overcome the shortcomings involved in the conventional technology mentioned above, and therefore, it is an object of the present invention to provide a music tuner which has a non-contact sensing device (microphone) and a contact sensing device (piezo device) and automatically selects a suitable sensing device under the circumstances.
It is another object of the present invention to provide a music tuner which is capable of detaching a part having the contact sensing device (piezo device) from the music tuner so that the tuner functions separately and independently from the piezo device.
It is a further object of the present invention to provide a music tuner which is capable of achieving high flexibility by allowing a tuner body having a display to freely pivot and rotate so that the user can see the display with an optimal viewing angle and direction.
It is still another object of the present invention to provided a music tuner which has a mirror display mode in which a music interval relationship is reversed on the display screen to a normal display mode.
It is a further object of the present invention to provide a music tuner which is able to display a combined music pitch which simultaneously shows both a normal display mode display and a mirror display mode such that the indicators move toward the center as the sound from the music instrument comes closer to the target sound.
The music tuner of the present invention for tuning a music instrument is comprised of: a tuner body having a display screen to show a pitch of a sound from the music instrument and a difference from a target sound; a non-contact sensing device that senses sounds from said music instrument through the air; a contact sensing device that senses sounds from the music instrument by physically contacting with the music instrument; and a circuitry to automatically select either the non-contact sensing device or the contact sensing device for processing the sounds from the music instrument by comparing an output level of the sensing device with a predetermined threshold level.
The music tuner of the present invention includes an attachment clip for attaching the music tuner to an object including the music instrument wherein the contact sensing device is mounted on the attachment clip. The non-contact sensing device is mounted on the tuner body. The tuner body is detachably connected to the attachment clip having the contact sensing device, thereby establishing the music tuner having both the non-contact sensing device and the contact sensing device.
The circuitry in the music tuner selects the contact sensing device for picking the sound of the music instrument when an output level of the contact sensing device is larger than the predetermined threshold level. Further, the circuitry determines whether a predetermined time has passed after the output level of the contact sensing device fell below the predetermined threshold level and selects the non-contact sensing device only if the predetermined time has passed.
The tuner body of the music tuner is attached to the attachment clip in a manner rotatable in clockwise and counterclockwise directions, and further, the tuner body is attached to the attachment clip in a manner pivotable in backward and forward directions.
The display screen displays a measured result of the sound from the music instrument either by a normal display mode or a mirror display mode. In the normal display mode, a lower frequency is displayed at a left side of the display screen and a higher frequency is displayed at a right side of the display screen. In the mirror mode, the lower frequency is displayed at the right side of the display screen and the higher frequency is displayed at the left side of the display screen. Further, the display screen is able to display the measured result of the sound from the music instrument by both the normal display mode and the mirror display mode at the same time.
According to the present invention, because the music tuner can automatically select the appropriate sound sensing device, the user need not worry about which sensing device to select. The user merely needs to attach the tuner to the music instrument. Because the tuner body is pivotable and rotatable, the user can enjoy an optimum viewing angle and condition. The mirror display function allows the user to obtain intuitive display image even when the specific circumstance forces the user to attach the tuner that would otherwise show the indicator in a reverse direction, etc.
FIGS. 12A(1)-12A(4) are diagrams showing the process of tuning the sound of the music instrument in a normal display mode in the music tuner of the present invention, and FIGS. 12B(1)-12B(4) are diagrams showing the process of tuning the sound in a mirror display mode of the music tuner of the present invention.
FIGS. 13A(1)-13A(4) are diagrams showing the process of tuning the sound of the music instrument in a normal display mode in the music tuner of the present invention, and FIGS. 13B(1)-13B(4) are diagrams showing the process of tuning the sound in a mirror display mode of the music tuner of the present invention.
The present invention is explained with reference to the accompanied drawings. The music tuner of the present invention incorporates both the contact sensing device, typically a piezo device, and the non-contact sensing device, typically a microphone, to effectively take advantage of the benefits of both types of sensing device while maximizing the display flexibility and minimizing the complexity of use.
In order to increase the usefulness, the music tuner of the present invention automatically selects either the microphone (non-contact sensing device) or the piezo device (contact sensing device). The music tuner of the present invention also includes a switch to manually selects either the microphone or the piezo device by the user. Thus, the user can set either the automatic mode or the manual mode depending on her unique situation.
The music tuner of the present invention has a tuner body which is freely rotatable, thereby allowing optimum view angle wherever the music tuner is placed. Further, the tuner body is detachably attached to an attachment clip, thus, the tuner body can be used separately from the attachment clip. The tuner body includes a display and the microphone while the attachment clip includes the piezo device, allowing various ways of use to match the particular situations of the user. The screen of the display is configured to graphically represent the tune of the music instrument so that the user can easily and intuitively grasp the pitch of the sound as compared with a standard pitch.
As noted above, the microphone 27 is a non-contact type sensing device to sense the music sound from a music instrument through the air. In the music tuner shown in
As shown in the rear view of
When the piezo device 37 is used, the piezo device 37 should be so placed that it can directly touch the music instrument to be tuned. The clip end 41 and the piezo device 37 tightly hold the music instrument to be tuned so as to sufficiently support the music tuner without being slipped or fell off from the music instrument. As is known in the art, the piezo device 37 is made of piezoelectric material such as crystal, ceramic, Rochelle salt, or barium titanate, etc., and converts the vibration from the music instrument to an electric signal.
Thus, in an embodiment of the present invention, the music tuner determines the selection between the piezo device 37 (contact sensing device) and the microphone (non-contact sensing device) by evaluating the parameters such as a strength of the signal level from the piezo device. As will be explained later, this configuration allows the user to attach the tuner to anywhere as the user wishes and attain appropriate selection of the sensing device (microphone or piezo device) to pick up the sound of her music instrument.
In the flow chart of
In either case, in step 104, the music tuner samples the input signal (musical sound) so that enough data is accumulated to determine fundamental frequency of the sound. For example, each of the collected data shows a time period of signal component in the input signal (musical sound). In step 105, the music tuner extracts the fundamental frequency of the music sound from the music instrument based on the collected data. This extraction process can be conducted, for example, through a self-correlation process as will be described later.
At step 106, the music tuner determines the target sound (standard note) based on the fundamental frequency extracted in step 105. For example, if the fundamental frequency is closest to G-sound, the music tuner interprets that the user want to tune the sound to G (target sound). Thus, in step 107, the music tuner compares the acquired fundamental frequency with the target sound, such as G, to determine the difference of the pitch from the target sound. Finally, the result is displayed on the screen to show the instrument's sound pitch and its difference from the standard pitch (target sound) in step 108 so that the user can adjust the tune of her music instrument.
In the automatic selection mode, the music tuner selects the microphone (non-contact sensing device) 27 when the tuner body of the present invention is detached from the attachment clip 25 because there will be no signal from the piezo device 37. The user can concentrate on playing a music instrument because the user need not manually switch between the microphone 27 and the piezo device 37. Moreover, because the user need not determine which music sensing device to use in each circumstance, the user does not have to learn as to when it is appropriate to choose a particular sensing device.
Next, the configuration of the music tuner of the present invention is described with reference to the block diagram of
The microphone 27 and the piezo device 37 are provided at the input of the music tuner to pick the sound of the music instrument. As noted above, the microphone 27 picks the sound of the music instrument through the air. The piezo device 37 picks the mechanical vibration (sound) from the music instrument and converts it into an electric signal. Outputs of the microphone 27 and the piezo device 37 are connected to the mic/piezo selection switch 35 which selects either one of the sensing device in response to a control signal from the mic/piezo selection control unit 63 in the CPU. The music sound selected by the mic/piezo selection switch 35 is amplified by the amplifier 36. The amplifier 36 has a high gain so that the sound wave is converted to square waves and is supplied to the pulse edge detection unit 51 in the CPU.
The output level of the piezo device 37 is monitored by the piezo level detection unit 63. If the piezo level is higher than a predetermined level, the piezo level detection unit 63 sends a signal to the mic/piezo selection control unit 61 to select the output from the piezo device 37 by the mic/piezo selection switch 35. Thus, the output signal from the piezo device 37 is used to measure the pitch of an instrument even when there is a sufficient signal level from the microphone 27. If the output level of the piezo device 37 is lower than the predetermined value, the output signal from the piezo will not be used.
The square waves from the amplifier 37 cross the zero volt level, edges (zero-crossing points) of the square waves are detected by the wave edge detection unit 51. The timer 53 measures the time period between two edges of the square waves. Because there are many zero cross points detected by the wave edge detection unit 51, the timer 53 produces a relatively large volume of time period data (zero-cross time data) which are consecutively sent to the RAM 57 through the timer data transfer 55. The RAM 57 stores the zero-cross time data from the timer 53, and when sufficient amount of data is collected, the zero-cross time data are sent to the buffer RAM 67 through the data transfer 65.
Since the music sound of the music instrument includes many frequency components other than the fundamental frequency, sufficient amount of zero-cross time data is needed to determine the fundamental frequency. The fundamental frequency extraction unit 69 performs self-correction on the zero-cross time data in the buffer RAM 67 to determine the fundamental frequency of the sound. The music tuner stores standard notes, for example, twelve temperament notes per octave, as target sounds to be compared with the extracted fundamental frequency. The note/pitch error calculation unit 71 determines a standard note closest to the fundamental frequency as a target sound and calculates the difference (pitch error) from the target sound. The music tuner displays the difference on the display screen 33.
In the flow chart of
In the case where the output level of the piezo device 37 exceeds the threshold level, the music tuner proceeds to step 204 where a “PiezoOffTimer” is stopped. The PiezoOffTimer is a timer which measures a time length from the point when the piezo output level became smaller than the threshold level to the point when the piezo output level exceeds the threshold level. In other words, the PiezoOffTimer starts to run when the output level from the piezo device is less than the threshold level and continues to run until the output of piezo device exceeds the threshold level. In other words, as will be explained in detail, the PiezoOffTimer is to prioritize the piezo device 37 in the music tuner. Since the piezo output level is higher than the threshold level, the PiezoOffTimer is stopped at step 204, and the music tuner selects the piezo device 37 as the sensing device in step 205.
Then, the process moves to steps 211 and 212 where the music sound through the piezo device 37 is processed for the data sampling, fundamental frequency extraction, and error pitch display. The process of steps 211 and 212 corresponds to the operation described in the foregoing with reference to the block diagram of
In step 203, in the situation where the output level of the piezo device 37 is lower than the threshold level L db, the process moves to step 206 to check whether the PiezoOffTimer is running. If the PiezoOffTimer is not running, the music tuner activates the PiezoOffTimer in step 207, which starts counting a time length during which the piezo output level is lower than the threshold level. In the case where the PiezoOffTimer is already running, the music tuner skips the process of step 207 and goes directly to step 208.
In step 208, the music tuner determines whether the output of the piezo device 37 is already selected. If the piezo device 37 is not selected, it means that the output of the microphone 27 is already selected. Thus, the music tuner skips the process of steps 209 and 210 and goes directly to the steps 211 and 212 described above without any changes. If the output of the piezo device 37 has been selected, at step 209, the music tuner determines whether a time length measured by the PiezoOffTimer's is longer than a predetermined time period T.
For example, the predetermined time period T is one (1) second. If the PiezoOffTimer's value is smaller than the predetermined time period T, this means that the output signal level of the piezo device 37 becomes larger than the threshold level within one (1) second. Then, the music tuner concludes that the output signal from the piezo device 37 should be used. Accordingly, the process moves directly to steps 211 and 212 without making any changes. Thus, the music tuner measures the output signal of the piezo device 37 in the same way after the step 205 noted above and returns to the step 203 for the next tuning.
However, if the PiezoOffTimer's value is longer than the predetermine time period T, one (1) second in the above example, the music tuner concludes that the output signal from the piezo device has been too weak for longer than the reasonable time length. As a result, the music tuner selects the output of the microphone 27 in step 210 to pick the music sound from the music instrument. The above noted steps are repeated, if necessary, for the other sounds of the musical instrument. In the preferred embodiment, the predetermined time period is about one (1) second as noted above, although other time length is also feasible.
As noted above with reference to
Another aspect of the present invention is a rotatable and detachable tuner body with a display screen to show the pitch of the sound from a music instrument.
The operation of the hinge portion 31 is explained with reference to
Further, the tuner body 23 is rotatably and detachably connected to the attachment clip 25 through a connection plug 43. This configuration is explained with reference to
In the configuration of the music tuner shown in
As in the foregoing, the tuner body 23 is pivotable in the backward and forward directions as well as rotatable in the clockwise and counterclockwise directions. Thus, the music tuner of the present invention allows the user to adjust the display so that the user can attain an optimum viewing angle when attaching the music tuner to a music instrument, a music stand, etc. Moreover, the user can read the display such that the lower pitch corresponds to the left of the display and the higher pitch corresponds to the right of the display whatever manner the music tuner is attached. Thus, the music tuner of the present invention allows the user a high flexibility and freedom.
A further aspect of the present invention is directed to display methods on the display screen 33 which will be described with reference to
FIGS. 12A(1)-12A(4) show the process and appearance of the display in a normal display mode when the music sound rises from the lower pitch to the higher pitch. More specifically, the indication at the center marked “0 CENT” means that the sound from the music instrument matches a target note (target sound). The highlighted dot on the left means that the sound from the music instrument is lower in pitch than the target note. The highlighted dot on the right means that the sound from the music instrument is higher in pitch than the target note.
Thus,
When the highlighted dot is on the left side than the center, the user will normally attempt to raise the tune. On the other hand, when the highlighted dot is on the right side than the center, the user will normally attempt to lower the tune. Although not shown in the drawings, the target note such as B, C, or A# is normally indicated on the display in an actual implementation.
FIGS. 12B(1)-12B(4) show an example of the mirror display mode by the music tuner of the present invention. The mirror display mode is provided in the music tuner to allow the user to view the screen from an opposite or reverse direction and still obtain intuitive measurement results. In the mirror display mode, the display where the indicator's relationship to the sound pitch is reversed as compared with the normal display mode.
As the music sound reaches the desired target note, the dot indication moves toward the center. Unlike the normal display mode, in the mirror display mode, the highlighted dot located at the left as in
Thus,
FIGS. 13B(1)-13B(4) show an example of the mirror display mode using the moving bar in the music tuner of the present invention. The highlighted bar in the right in
The mirror display function is useful when the display cannot be positioned in a normal angle. For example, in the case where the user has to place the tuner in such a way that the user has to see the display from an opposite direction, it is confusing for the user to interpret the display because the user is used to see the normal display mode. In such a case, the mirror display allows the user to see the display that is substantially the same as the normal display mode that is familiar to the user. Accordingly, the user can grasp the pitch on the display intuitively.
Thus,
In the example of
As has been foregoing, because the music tuner of the present invention can automatically select the appropriate sound sensing device, the user need not worry about which sensing device to select. The user merely needs to attach the tuner to the music instrument. Because the tuner body is pivotable and rotatable, the user can enjoy an optimum viewing angle and condition. The mirror display function allows the user to obtain intuitive display image even when the specific circumstance forces the user to attach the tuner that would otherwise show the indicator in a reverse direction, etc.
Although the present invention is described herein with reference to the preferred embodiment, one skilled in the art will readily appreciate that various modifications and variations may be made without departing from the spirit and scope of the present invention. Such modifications and variations are considered to be within the purview and scope of the appended claims and their equivalents.
