Sub-band Adaptive Differential Pulse Code Modulation

What Does Sub-band Adaptive Differential Pulse Code Modulation Mean?

Sub-band adaptive differential pulse code modulation (SB-ADPCM) is a 7kHz wideband speech codec based on the sub-band coding of two ADPCM channels.


SB-ADPCM is defined in G.722 of the International Telecommunication Standardization Sector (ITU-T) standards. In November 1988, G.722 was approved by ITU-T. SB-ADPCM is used to transmit a large amount of voice data.

Techopedia Explains Sub-band Adaptive Differential Pulse Code Modulation

G.722 and SB-ADPCM, which are followed in Voice over Internet Protocol (VoIP) applications, provide improved speech quality over older codecs, such as G.711. G.722.

SB-ADPCM codes voice signals into signals that can be easily transmitted over the Internet and other networks. This algorithm can compress voice data, allowing the same data to be transmitted in less time than other techniques may allow.


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Margaret Rouse is an award-winning technical writer and teacher known for her ability to explain complex technical subjects to a non-technical, business audience. Over the past twenty years her explanations have appeared on TechTarget websites and she's been cited as an authority in articles by the New York Times, Time Magazine, USA Today, ZDNet, PC Magazine and Discovery Magazine.Margaret's idea of a fun day is helping IT and business professionals learn to speak each other’s highly specialized languages. If you have a suggestion for a new definition or how to improve a technical explanation, please email Margaret or contact her…