帮我找一个c语言频率计的代码
时间: 2023-07-16 18:17:25 浏览: 37
以下是一个简单的C语言频率计代码,可以实现对输入信号的频率计算:
```c
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#define PI 3.14159265358979323846
int main()
{
double sample_rate, time_duration, frequency;
int num_samples, i;
double *samples, max_value, threshold;
int above_threshold_count, peak_count;
printf("Enter sample rate (Hz): ");
scanf("%lf", &sample_rate);
printf("Enter time duration (s): ");
scanf("%lf", &time_duration);
num_samples = (int)(sample_rate*time_duration);
samples = (double*)malloc(num_samples*sizeof(double));
printf("Enter %d samples:\n", num_samples);
for(i=0; i<num_samples; i++)
{
scanf("%lf", &samples[i]);
}
max_value = samples[0];
for(i=1; i<num_samples; i++)
{
if(samples[i] > max_value)
{
max_value = samples[i];
}
}
threshold = max_value/2.0;
above_threshold_count = 0;
for(i=0; i<num_samples; i++)
{
if(samples[i] > threshold)
{
above_threshold_count++;
}
}
peak_count = above_threshold_count/2;
frequency = (double)peak_count/time_duration;
printf("Frequency: %lf Hz\n", frequency);
free(samples);
return 0;
}
```
该代码通过读取用户输入的采样率和时间时长,以及输入的采样数据来计算信号的频率。该代码还使用了一个简单的峰值检测算法来确定信号中的峰值数量,从而计算出信号的频率。请注意,该代码仅适用于输入的信号是周期性的情况。