Definition - What does G.721 mean?
G.721 is an ITU Telecommunications Standardization Sector standard codec that uses adaptive differential pulse code modulation (ADPCM) to produce digital signals with a lower bit rate than standard pulse code modulation.
Techopedia explains G.721
G.721 was introduced in 1984 and is used for audio compression and decompression. This standard for speech codec uses adaptive differential pulse code modulation on a 32 Kbps channel.
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