get_gain.c

关于AMR-WB+语音压缩编码的实现代码

#include "../include/amr_plus.h"
float get_gain(     /* output: codebook gain (adaptive or fixed) */
  float x[],        /* input : target signal                     */
  float y[],        /* input : filtered codebook excitation      */
  int n             /* input : segment length                    */
)
{																												
    float corr = 0.0f, ener = 1e-6f;
    short i;
    for (i = 0; i < n; i++) {
        corr += x[i]*y[i];
        ener += y[i]*y[i];
    }
    return(corr/ener);
}