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| adaptive delta modulation (MAC audio, CCITT Rep. 953); continuously variable slope delta modulation (voice mail processing code, ITU-T (CCITT) Rec. G.721) | |||
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| adaptive delta modulation (MAC audio, CCITT Rep. 953); continuously variable slope delta modulation (voice mail processing code, ITU-T (CCITT) Rec. G.721) | |||
