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How Convert Sample Rate. Oversampling

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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How to Improve Sound Quality

Tutorials

In this article term "to improve sound quality" mean "to decrease sound playback distortions at analog output of digital-analog converter". How to try to decrease the playback distortions for used equipment or portable device (digital audio player, mobile phone, etc.) will be considered below.

AuI ConverteR 48x44 - Free Music Converter
AuI ConverteR 48x44 - Free Audio Converter

AuI ConverteR 48x44 is pro audio converter of music files DSF, DFF, ISO (1-bit audio), FLAC, WAV, AIFF, m4a, CD-audio, CUE, APE, ogg, mp3. The converter is intended for music production and audiophiles.

AuI ConverteR 48x44 FREE may be used as free audio converter for Windows and Mac OS X. There is professional digital audio processing (altering resolution - sample rate, bit depth and dithering) of audio files is provided.

Read more...
 
 

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