Denoising algorithm for audio processing---audio 16000hz and 8bit denoising algorithm based on PCM and g711

(1) Application background

(2) Principle of main noise reduction algorithm

(3) algorithm flow

(4) Algorithm implementation

(5)

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(1) Application background

Based on 8148 of audio ALSA acquisition, A8 encoded into g711 or DSP encoded into AAC, then RTP broadcast VLC play, sampling rate is 16000hz, 8bit, Europe and the United States Ulaw, Mono. Due to voltage or other causes of the acquisition of PCM audio will appear a regular frequency of the pop sound, here want to use the noise reduction algorithm to remove it. Input red Mic4 phone headphone output, output RTP network out to the computer VLC play

(2) Principle of main noise reduction algorithm

Mainstream algorithms have

1. Fourier expansion, go to the frequency domain, eliminate the unwanted frequency.

2. Open Source Library FFTW http://www.fftw.org/

3. Time domain drawing is easy, FFT is a three-layer loop, sort. Base-2 fission algorithm reading

(3) algorithm flow

(4) Algorithm implementation

(5)

http://www.csto.com/p/12482 CSDN Demand 1w

Http://bbs.csdn.net/topics/360054544?page=1

Denoising algorithm for audio processing---audio 16000hz and 8bit denoising algorithm based on PCM and g711