MOBILE PHONE MUTE IDENTIFICATION APPARATUS AND MOBILE PHONE MUTE NOISE CANCELLATION METHOD AND SYSTEM

摘要

A mobile phone mute identification apparatus and a mobile phone mute noise cancellation method and system are disclosed in the present invention, wherein the mobile phone mute identification apparatus includes a filter module (10), which is used to receive audio signals sent by a mobile phone baseband chip or an audio encoding and decoding chip and perform filtering, to filter out speech analogue signals, and to output noise analogue signals, a rectification module (20), which is used to transfer the noise analogue signals into noise digital signals, a amplifier module (30), which is used to amplify the noise digital signals, and a switch output module (40), which is used to compare the amplified noise digital signals with an initiation threshold of the switch output module, and to output a compare result as an action condition of a mobile phone mute noise cancellation. The present invention, through automatically identifying a mobile phone uplink mute mode, and closing a gain amplifier connected to a mobile phone phonation apparatus or reducing audio frequency power output to the mobile phone phonation apparatus, can avoid noise interference in an uplink mute mode, achieve the purpose of mute noise cancellation, and reduce the mobile phone power dissipation at the same time.