Embedded ADPCM with noise spectral shaping for packet voice transmission

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Abstract
An embedded adaptive differential pulse code modulation (EADPCM) that may be used for speech coding in a packet network is proposed. In this scheme the quantisation nosie of an ADPCM is reduced significantly by employing an instant-aneously adaptive PCM (ADPCM) as a second-stage coder, and is shaped further to reduce the subjectively annoying effects by a noise-shaping filter. By computer simulation using real speech we show a significant performance improvement (3 to 10dB at rates of 16 to 48 kbit/s) with the proposed scheme.

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