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Downsampling. Decimation Audio [How to Convert Sample Rate Explained]

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Audio Basis - educational articles

Downsampling is kind of sample rate conversion - dividing frequency (decimation of samples). Read how to work downsampling.

Here we watch how changed spectrum audio after downsampling.

Downsampling

Downsampling

On top of the picture we see spectrum of source audio signal with sampling rate Fd. Spectrum on probation contains 2 areas (blue and light blue). We see what light blue placed above Fd/4.

We will decrease (divide 2 times) sample rate source audio and watch to metamorphoses of its spectrum. New sample rate is Fd new = Fd / 2.

How divided sample frequency (downsampling)? We remove every second sample of source signal.

Downsampling on time axis

Output spectrum we see on bottom of the picture. Light blue area of source spectrum mirrored on spectrum of audio with divided sampling rate. It is non-linear distortions arose in useful spectrum band after dividing sampling rate.

 

Possible avoid it?

Yes. Before dividing need filter (suppress) source spectrum above Fd new / 2 = Fd / 4.

Downsampling with filtering

About oversampling read here...

 

 


Read about sample rate issues

 

 


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