Multi -MIC noise reduction method used for mobile phone

Abstract

The invention discloses a multi-MIC noise reduction method used for a mobile phone. The multi-MIC noise reduction method comprises the steps of S1, determining an MIC, which is closest to a terminal user, from all the MIC of the mobile terminal; S2, setting the MIC closest to the terminal user as a primary MIC and other MIC as secondary MIC; and S3, processing voice signals obtained by the primary MIC and the secondary MIC by using a noise reduction algorithm so as to obtain enhanced voice signals, wherein the step S3 specifically comprises the sub-steps of S301, performing voice endpoint detection for the voice signals obtained by the secondary MIC so as to obtain a pure noise segment and a noise-carrying voice segment, S302, self-adapting to the noise signals in the noise-carrying voice segment by adopting an improved LMS self-adapting filter and regarding the pure noise segment as the input in a least mean square algorithm of noise so as to obtain the voice signals being subjected to the self-adaptive filtration processing, and S303, performing spectral subtraction for the voice signals of the primary MIC and the voice signals being subjected to the self-adaptive filtration processing so as to obtain enhanced voice signals. The multi-MIC noise reduction method used for the mobile phone is good in noise reduction effect and can improve the tone quality of a mobile terminal.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a multi-MIC noise reduction method for a mobile terminal. Background technique [0002] The history of microphones can be traced back to the end of the 19th century. Scientists used carbon grain microphones and liquid microphones to improve the then newly invented telephone. In 1949, Winiboust Labs developed the first feedback-suppressed MD4 microphone to reduce noise, which can suppress noise feedback and reduce background noise in noisy environments. Since then, the wave of microphone noise reduction research has begun. [0003] Nowadays, as a traditional voice collection method, a microphone has been widely used in various mobile terminals. With the increasing quality of life, people's requirements for voice quality are also rising. The speech signal received by a traditional single microphone is a linear superposition of each signal in the sound field, and it is impo...

AI Technical Summary

Problems solved by technology

Customers of domestic mobile phones such as Xiaomi and Huawei who have applied this technology have reported that the call volume is low due to multiple MIC noise reduction, which seriously affects the call quality

Moreover, foreign noise reduction chips are highly confidential and expensive. At present, the domestic mobile phone industry still relies on the purchase of foreign multi-microphone noise reduction algorithm modules.

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