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Oversampling. Upsampling Audio [How to Convert Sample Rate Explained]


Audio Basis - educational articles

Oversampling (upsampling) is sample rate multiplication. Read how to work oversampling.

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

Oversampling. Upsampling


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...



Read about sample rate issues



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