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Windows® 98 Unleashed by Paul McFedries

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Audio Codecs

As their quality increases, sound files take up a progressively bigger chunk of your hard disk. To help reduce the load, codecs are used to compress digitized audio and then decompress it for playing. Windows 98 comes with a number of 32-bit codecs. Here's a list of the Microsoft codecs:

Adaptive Delta Pulse Code Modulation (ADPCM): This codec works by storing the differences between consecutive PCM samples. This allows ADPCM to store audio data in just 4 bits, which is a 4:1 compression ratio over 16-bit audio. This codec reproduces low frequencies well but tends to distort high frequencies. However, these distortions are barely noticeable at higher sampling frequencies.

Consultative Committee for International Telephone and Telegraph ...

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