ADPCM (Adaptive Differential Pulse Code Modulation), is one for 16bits (or 8bits or higher) voice waveform data of a lossy compression algorithm, it will sound stream data for each sampling 16bit 4bit storage, so the compression ratio 1:4. and compression/decompression algorithm is very simple, it is a low space consumption, high quality sound and efficient way to get good. Save the sound data file extension name. AUD mostly use ADPCM compression

ADPCM.C

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