将Matlab频谱图的值缩放到实际范围 [英] To scale values from Matlab's spectrogram to real range

问题描述

我跑步

spectrogram(data, 64, 60, 256, 2,  'yaxis');

我知道

我想获得0到180 Hz的范围，而不是0到1的归一化范围. 我可以通过以下方式更改轴

I want to get range from 0 to 180 Hz, instead of normalised range from 0 to 1. I can change axis by

axis([0 450 0 180])

但它不会更改值.

我跑步失败

spectrogram(180 .* data, 64, 60, 256, 2,  'yaxis');

如何将范围从标准化范围缩放到实际范围?

推荐答案

x轴应为频率.您需要知道data的采样率fs(是2吗?).则频率范围将为(0:63)/64*fs

The x-axis should be frequency. You need to know the sampling rate fs (is it 2 ?) of data. Then the frequency range will be (0:63)/64*fs

实际上，您可以在频谱图功能中获得频率输出:

Actually you can get the frequency output in the spectrogram function:

[B,F,T]=spectrogram(data,64,60,256,2);  % if fs = 2 in your case

F是频率范围.

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