给我一个music算法求功率谱的matlab代码
时间: 2023-11-27 18:05:25 浏览: 31
好的,下面是一个简单的基于FFT的求功率谱密度的MATLAB代码:
```matlab
% 输入音频文件名和窗口大小
filename = 'example.wav';
window_size = 1024;
% 读取音频文件
[x, fs] = audioread(filename);
% 分帧处理,每帧长度为window_size
num_frames = floor(length(x) / window_size);
x_frame = reshape(x(1:num_frames*window_size), window_size, num_frames);
% 加窗
win = hamming(window_size);
x_frame_windowed = bsxfun(@times, x_frame, win);
% 计算功率谱
psd = abs(fft(x_frame_windowed, [], 1)).^2 / window_size / fs;
% 取前一半(正频率部分)并取对数
psd = 10 * log10(psd(1:window_size/2, :));
% 绘制频谱图
f = (0:window_size/2-1) / window_size * fs;
t = (0:num_frames-1) * window_size / fs;
imagesc(t, f, psd);
axis xy;
xlabel('Time (s)');
ylabel('Frequency (Hz)');
```
注意:这只是一个简单的示例代码,实际使用时需要根据具体场景进行调整。