1. Technical Field
The present disclosure relates to audio devices, and particularly to an audio signal processing device.
2. Description of Related Art
A common media player, such as an moving picture experts group audio layer-3 (MP3) player, is just capable of playing audio files stored therein. For example, the common media player can be used to play music for entertainment, or can be used to play foreign language audio files for study. An earphone is generally connected to the media player for a user to listen to the audio files therein, and the earphone can also reduce or eliminate noise from outside environment. However, the user sometimes needs to hear the noise from the outside environment, for example, someone is talking to the user, then the user has to remove the earphone out from his ear to respond appropriately, which is inconvenient and troublesome.
Referring to
The first audio signal input port 10 receives an audio signal from a portable electronic device 200, such as a moving picture experts group audio layer-3 (MP3) player. The first audio signal input port 10 and the portable electronic device 200 may be interconnected wirelessly or via electrical wires. The audio signal from the portable electronic device 200 is defined as a first voice analog signal and inputted into the first audio signal input port 10.
The second audio signal input port 30 receives noise from outside environment. In one exemplary embodiment, the second audio signal input port 30 is a mini microphone to receive the noise from outside environment. The noise from outside environment is defined as a second voice analog signal and inputted into the second audio signal input port 30.
The audio decoder-coder 20 converts the first voice analog signal into a first voice digital signal, and converts the second voice analog signal into a second voice digital signal. The first voice digital signal and the second voice digital signal are mixed up to obtain a third voice digital signal. The third voice digital signal is then converted by the audio decoder-coder 20 into a third voice analog signal and transmitted to the audio signal output port 50.
The regulator 40 modulates the signal intensity of the first voice analog signal and the second analog signal which are inputted into the audio decoder-coder 20. For example, the signal intensity of the second voice analog signal may be lessened when the noise from the outside environment is not conveying information interesting to the user, or may be enhanced when the noise from the outside environment is conveying certain information the user would like to know.
The audio signal input port 50 is connected to an earphone 300, to output the mixed third voice analog signal to the earphone 300.
Referring to
When the movable button 44 is moved to a first end 431 of the variable resistor 43, the signal intensity of the first voice analog signal is maximally enhanced, and the signal intensity of the second voice analog signal is maximally lessened. Therefore, almost only the audio signal from the portable electronic device 200 is transmitted to the earphone 300 via the audio signal output port 50, and the noise from outside environment can not be heard via the earphone 300.
When the movable button 44 is moved to a second end 432 of the variable resistor 43, the signal intensity of the second voice analog signal is maximally enhanced, and the signal intensity of the first voice analog signal is maximally lessened. Therefore, almost only the noise from outside environment is transmitted to the earphone 300 via the audio signal output port 50, and the audio signal from the portable electronic device 200 cannot be heard via the earphone 300.
When the movable button 44 is moved to a middle of the variable resistor 43, the signal intensity of the first voice analog signal and the second voice analog signal is equal to each other. Therefore, the noise from outside environment and the audio signal from the portable electronic device 200 are both transmitted to the audio signal output port 50, and the noise from outside environment and the audio signal from the portable electronic device 200 both can be heard via the earphone 300.
The audio signal processing device 100 may be a separate body, and also can be integrated into the portable electronic device 200 or the earphone 300. Therefore, a user can hear the noise of the outside environment in need via the earphone 300, and does not need to remove the earphone 300 out from his ear.
It is to be understood, however, that even though numerous characteristics and advantages of the present disclosure have been set forth in the foregoing description, together with details of the structure and function of the disclosure, the disclosure is illustrative only, and changes may be made in details, especially in matters of shape, size, and arrangement of parts within the principles of the disclosure to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
Number | Date | Country | Kind |
---|---|---|---|
200910305365.4 | Aug 2009 | CN | national |