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How Convert Sample Rate. Oversampling

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Audio Basis - educational articles

Here we will say about oversampling - sample rate conversion multiplexing. Here we watch how changed spectrum audio for multiplexing sampling frequency.

Usually multiplexing of sample rate released as inserting ZERO SAMPLES (virtual samples) between "real" source samples.

Oversampling - inserting zero samples

 

After oversampling spectrum mirrored to upper half of old sample rate fd. So we get mirrored copy of source audio spectrum (upper part of picture).

Oversampling - sample rate miltiplying

 

It is non-linear distorttions in output (oversampled) audio signal.

For getting non-distorted (almost non-distorted, of course) oversampled audio signal, after oversampling need apply low frequency filtration with band from 0 to fd/2.

Filtering audio signal after oversampling

So we get almost clean oversampled source audio signal (music).

About downsampling read here...

 

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