speex库中音频降噪效果不错，应该是应用最广泛的吧，speex库下载地址https://www.speex.org/downloads/，可以直接下载二进制代码使用，像配置OpenCV一样配置speex库就可以了。speex库的API参考文档下载：http://download.csdn.net/detail/yizhaoyanbo/9856894。
贴出C语言实现的音频降噪代码如下。
代码中采样率、音频帧大小需要根据实际情况设置，HEADLEN是WAV格式的文件头，占44个字节，这44个字节是不需要处理的，不然文件头会损坏，导致得到的结果无法播放。
noiseSuppress的值可以控制减除的噪声强度，负值越小，噪声去除的强度越大，同时会造成原声的失真，需要作出权衡。
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <assert.h>
#include <string.h>
#include <speex/speex_preprocess.h>
#include <speex/speex.h> #define HEADLEN 44
#define SAMPLE_RATE (48000)
#define SAMPLES_PER_FRAME (1024)
#define FRAME_SIZE (SAMPLES_PER_FRAME * 1000/ SAMPLE_RATE)
#define FRAME_BYTES (SAMPLES_PER_FRAME)
int main()
{
size_t n = ;
FILE *inFile, *outFile;
fopen_s(&inFile, "./audio/input01L.wav", "rb");
fopen_s(&outFile, "./audio/output01L.wav", "wb"); char *headBuf = (char*)malloc(HEADLEN);
char *dataBuf = (char*)malloc(FRAME_BYTES * );
memset(headBuf, , HEADLEN);
memset(dataBuf, , FRAME_BYTES);
assert(headBuf != NULL);
assert(dataBuf != NULL); SpeexPreprocessState *state = speex_preprocess_state_init(, SAMPLE_RATE);
int denoise = ;
int noiseSuppress = -;
speex_preprocess_ctl(state, SPEEX_PREPROCESS_SET_DENOISE, &denoise);
speex_preprocess_ctl(state, SPEEX_PREPROCESS_SET_NOISE_SUPPRESS, &noiseSuppress); int i;
i = ;
speex_preprocess_ctl(state, SPEEX_PREPROCESS_SET_AGC, &i);
i = ;
speex_preprocess_ctl(state, SPEEX_PREPROCESS_SET_AGC_LEVEL, &i);
i = ;
speex_preprocess_ctl(state, SPEEX_PREPROCESS_SET_DEREVERB, &i);
float f = ;
speex_preprocess_ctl(state, SPEEX_PREPROCESS_SET_DEREVERB_DECAY, &f);
f = ;
speex_preprocess_ctl(state, SPEEX_PREPROCESS_SET_DEREVERB_LEVEL, &f); //静音检测
/*int vad = 1;
int vadProbStart = 80;
int vadProbContinue = 65;
speex_preprocess_ctl(state, SPEEX_PREPROCESS_SET_VAD, &vad);
speex_preprocess_ctl(state, SPEEX_PREPROCESS_SET_PROB_START, &vadProbStart);
speex_preprocess_ctl(state, SPEEX_PREPROCESS_SET_PROB_CONTINUE, &vadProbContinue);*/ bool flag = true; while ()
{
if (flag == true)
{
flag = false;
n = fread(headBuf, , HEADLEN, inFile);
if (n == )
break;
fwrite(headBuf, , HEADLEN, outFile);
}
else
{
n = fread(dataBuf, , SAMPLES_PER_FRAME, inFile);
if (n == )
break;
speex_preprocess_run(state, (spx_int16_t*)(dataBuf));
fwrite(dataBuf, , SAMPLES_PER_FRAME, outFile);
}
} free(headBuf);
free(dataBuf);
fclose(inFile);
fclose(outFile);
speex_preprocess_state_destroy(state);
return ;
}