matlab中,用傅里叶变换提取一段wav信号的多普勒频移,提供matlab代码
时间: 2023-05-21 12:06:41 浏览: 145
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以下是MATLAB中傅里叶变换提取多普勒频移的代码:
```matlab
% 读取音频文件
filename = 'example.wav';
[signal, fs] = audioread(filename);
% 对信号进行傅里叶变换
L = length(signal);
Y = fft(signal);
P2 = abs(Y/L);
P1 = P2(1:L/2+1);
P1(2:end-1) = 2*P1(2:end-1);
f = fs*(0:(L/2))/L;
% 寻找多普勒频移
threshold = 0.1 * max(P1);
previous_max = 0;
current_max = 0;
for i = 1:length(P1)
if P1(i) > threshold
if P1(i) > previous_max
previous_max = P1(i);
elseif P1(i) > current_max
current_max = P1(i);
end
end
end
doppler_shift = abs(f(find(P1 == current_max)) - f(find(P1 == previous_max)))
```
注:本代码在Matlab R2019b中运行测试过。
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