Downsample audio signal am I doing it right?

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Isida Kaloshi
Isida Kaloshi 2018-12-4
评论： Walter Roberson 2020-6-18
Hello,
I have an audio file and I want to perform Downsampling
form 44100 to 22050 / from 22050 to 11025 / from 11025 to 8000
Please find bellow my code.
[samples,fs] = audioread ('piano.wav');
audiowrite('piano.wav', samples,fs);
subplot (2,1,1)
plot(samples)
xlabel 'audio signal'
% processing second part downsampling
S1 = resample(fs,22050,44100); % downsample from 44100 to 22050
S2 = resample (S1,11025,22050); % downsample from 22050 to 11025
S3 = resample (S2,8000,11025); % doensample from 11025 to 8000
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Henrik Gunnar Sundt
Henrik Gunnar Sundt 2020-6-18
You probably mean:
S1 = resample(samples,22050,44100);
not:
S1 = resample(fs,22050,44100);

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回答（1 个）

Yash Bansod
Yash Bansod 2019-9-27
I don't think that you are doing it rigt.
The following post describes the correct procedure: https://www.mathworks.com/help/signal/ug/changing-signal-sample-rate.html
To summerize:
% Code to read audio files
[y,Fs] = audioread(filename);
% code to resample audio
Fs_new = 16000;
[Numer, Denom] = rat(Fs_new/Fs);
y_new = resample(y, Numer, Denom);
% Code to play an already read audio file
sound(y, Fs);

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