An environmental noise filtering method and device for mobile phone
A technology of environmental noise, mobile phone, applied in the direction of selection device, structure of telephone set, electrical components
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[0027] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0028] Fig. 1 shows a preferred embodiment of the noise filtering device of the present invention. As shown in FIG. 1 , the noise filtering device 1 includes two microphones and a differential amplifier circuit 12 connected thereto. Wherein the microphone 10 for picking up the human voice is placed at a position relatively close to the caller to receive the caller's voice, and the signal actually received is the superposition of the pure call sound signal and the ambient noise signal, that is, the call that includes the ambient noise sound. The microphone 11 for picking up noise is placed far away from the speaking voice to receive the noise of the surrounding environment, such as being placed on the back of the mobile phone or the back of the receiver of the mobile phone, etc., depending on the specific structure. The differential amplifying circuit ...
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