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What is the difference among G.729, G.729AB and G ...

What is the difference among G.729, G.729AB and G.729.1 codecs? 

 


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Standard G.729 codec operates at 8 kbps and mostly used in VoIP Application.

G.729a codec is similar and fully compatible with G.729 codec but requires less computation hence the speech quality slighly detoriate. 

Whereas G.729.1 codec has been designed to provide better quality and more flexibility than G.729. G.729.1 is scalable in bit rate, rational bandwidth and complexity. And The bitstream of G.729.1 is structured into 12 hierarchical layers.

 To understand more regarding pros and cons of various speech codecs one can refer to http://speech-codecs.blogspot.com/
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