音频信号的产生低音的虚拟谐波控制音频信号C代码
时间: 2023-09-01 08:06:22 浏览: 35
以下是一个简单的音频信号的产生低音的虚拟谐波控制的C代码:
```c
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#define SAMPLE_RATE 44100
#define FREQ_LOW 40
#define FREQ_HIGH 80
#define Q_FACTOR 1.5
#define AMPLITUDE 0.5
#define BUFFER_SIZE 4096
double lowpass_filter(double input, double prev_output, double cutoff_freq, double q_factor)
{
double omega_c = 2 * M_PI * cutoff_freq / SAMPLE_RATE;
double alpha = sin(omega_c) / (2 * q_factor);
double b0 = (1 - cos(omega_c)) / 2;
double b1 = 1 - cos(omega_c);
double b2 = (1 - cos(omega_c)) / 2;
double a0 = 1 + alpha;
double a1 = -2 * cos(omega_c);
double a2 = 1 - alpha;
double output = (b0 / a0) * input + (b1 / a0) * prev_output + (b2 / a0) * (prev_output - a1 * input) + (a2 / a0) * prev_output;
return output;
}
int main()
{
double freq = (FREQ_LOW + FREQ_HIGH) / 2.0;
double cutoff_freq = FREQ_LOW / sqrt(2);
double q_factor = Q_FACTOR;
double amplitude = AMPLITUDE;
double phase = 0.0;
double prev_output = 0.0;
double buffer[BUFFER_SIZE];
int num_samples = 0;
int i;
while (num_samples < SAMPLE_RATE) {
for (i = 0; i < BUFFER_SIZE && num_samples < SAMPLE_RATE; i++) {
double input = amplitude * sin(2 * M_PI * freq * num_samples / SAMPLE_RATE + phase);
double output = lowpass_filter(input, prev_output, cutoff_freq, q_factor);
buffer[i] = output;
prev_output = output;
num_samples++;
}
fwrite(buffer, sizeof(double), i, stdout);
}
return 0;
}
```
该代码与前面的代码类似,但它使用了一个缓冲区来产生连续的音频信号。它将每个样本的输出存储在缓冲区中,并在缓冲区填满后将其写入标准输出。该代码可以直接重定向到音频播放器,以产生低音虚拟谐波控制的音频信号。您可以修改该代码以实现更高级的音频处理,例如添加其他滤波器、混响和合唱效果等。