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Noise Feedback Coding Revisited: Refurbished Legacy Codecs and New Coding Models
Authors:Stephane Ragot  Balazs Kovesi  Alain Le  Guyader
Affiliation:Stéphane Ragot,Balázs Kvesi,and Alain Le Guyader(audiOvisual and sPEech foR quAlity(OPERA) Lab.,Orange Labs,Lannion,France)
Abstract:Noise feedback coding(NFC) has attracted renewed interest with the recent standardization of backward-compatible enhancements for ITU-T G.711 and G.722.It has also been revisited with the emergence of proprietary speech codecs,such as BV16,BV32,and SILK,that have structures different from CELP coding.In this article,we review NFC and describe a novel coding technique that optimally shapes coding noise in embedded pulse-code modulation(PCM) and embedded adaptive differential PCM(ADPCM).We describe how this new technique was incorporated into the recent ITU-T G.711.1,G.711 App.III,and G.722 Annex B(G.722B) speech-coding standards.
Keywords:speech coding  noise shaping  noise feedback coding  G  711  G  722
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