基于音量控制的低音增强算法c代码
时间: 2023-09-10 13:05:59 浏览: 36
以下是一个简单的基于音量控制的低音增强算法的C代码示例:
```c
#include <stdlib.h>
#include <math.h>
#define SAMPLE_RATE 44100
#define PI 3.14159265358979323846f
// 定义一个结构体来保存滤波器状态
typedef struct {
float a0, a1, a2, b1, b2;
float x1, x2, y1, y2;
} filter_t;
// 初始化滤波器状态
void init_filter(filter_t *f, float fc, float Q) {
float w0 = 2 * PI * fc / SAMPLE_RATE;
float alpha = sin(w0) / (2 * Q);
float cosw0 = cos(w0);
f->a0 = (1 + alpha);
f->a1 = (-2 * cosw0);
f->a2 = (1 - alpha);
f->b1 = (-2 * cosw0);
f->b2 = (1 - alpha);
f->x1 = f->x2 = f->y1 = f->y2 = 0;
}
// 应用滤波器
float apply_filter(filter_t *f, float x0) {
float y0 = f->a0 * x0 + f->a1 * f->x1 + f->a2 * f->x2 - f->b1 * f->y1 - f->b2 * f->y2;
f->x2 = f->x1;
f->x1 = x0;
f->y2 = f->y1;
f->y1 = y0;
return y0;
}
// 应用增益
float apply_gain(float x0, float gain) {
return x0 * gain;
}
// 应用低音增强
float apply_bass_boost(float x0, float gain, float fc, float Q) {
static filter_t filter1, filter2;
init_filter(&filter1, fc, Q);
init_filter(&filter2, fc, Q);
float x1 = apply_filter(&filter1, x0);
float x2 = apply_filter(&filter2, x1);
float y = apply_gain(x2, gain);
return y;
}
```
这个算法通过两个二阶滤波器来实现低音增强,其中`fc`和`Q`分别是滤波器的截止频率和品质因数,`gain`表示增益。您可以根据需要调整这些参数来满足不同的需求。