Noise Feedback Coding Revisited: Refurbished Legacy Codecs and New Coding Models |
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Authors: | Stephane Ragot Balazs Kovesi Alain Le Guyader |
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Affiliation: | Stéphane Ragot,Balázs Kvesi,and Alain Le Guyader(audiOvisual and sPEech foR quAlity(OPERA) Lab.,Orange Labs,Lannion,France) |
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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. |
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Keywords: | speech coding noise shaping noise feedback coding G 711 G 722 |
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