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A Multiband Excited Waveform-Interpolated 2.35-kbps Speech Codec for Bandlimited Channels

Brooks, F.C.A. and Hanzo, L. (2000) A Multiband Excited Waveform-Interpolated 2.35-kbps Speech Codec for Bandlimited Channels IEEE Transactions on Vehicular Technology, 49, (3), pp. 766-777.

Record type: Article


Following a brief portrayal of the activities in 2.4-kbps speech coding, a wavelet-based pitch detector is invoked, which reduces the complexity of conventional autocorrelation-based pitch detectors, while ensuring smooth pitch trajectory evolution. This scheme is incorporated in a waveform-interpolated codec, which uses voiced–unvoiced (V/U) classification, and instead of simple Dirac pulses, an unconventional zinc basis function excitation is employed for modeling the voiced excitation. The required zinc-function parameters are determined in an analysis-by-synthesis loop, and for the sake of smooth waveform evolution and reduced complexity, a focused search strategy and a few further suboptimum restrictions are imposed without seriously affecting the speech quality. This baseline codec operates at a rate of 1.9 kbps, but it suffers from slight buzziness during the periods of excessive voicing. This impediment is then mitigated by invoking a mixed V/U multiband excitation, which slightly increases the bit rate to 2.35 kbps due to the transmission of the 3-b voicing strength code in each of the three excitation bands. Index Terms—Low-rate speech coding, multiband excitation, waveform-interpolated speech coding, wavelet-based pitch estimation.

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Published date: May 2000
Organisations: Southampton Wireless Group


Local EPrints ID: 253685
ISSN: 0018-9545
PURE UUID: 7cf0abfe-12bf-4163-aa73-6b5c2512a4af

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Date deposited: 12 Jan 2004
Last modified: 18 Jul 2017 09:56

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Author: F.C.A. Brooks
Author: L. Hanzo

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