Title :
Joint design of channel-optimized multistage vector quantizer
Author :
Krishnan, Venkatesh ; Anderson, David V.
Author_Institution :
Sch. of Electr. & Comput. Eng., Georgia Inst. of Technol., Atlanta, GA, USA
Abstract :
A novel channel-optimized multistage vector quantization (COMSVQ) codec is presented in which the stage codebooks are jointly designed. The proposed codec uses a signal source and channel-dependent distortion measure to encode line spectral frequencies derived from segments of a speech signal. Simulation results are provided to demonstrate the consistent reduction in the spectral distortion obtained using the proposed codec as compared to the conventional sequentially designed channel-matched multistage vector quantizer.
Keywords :
combined source-channel coding; distortion; spectral analysis; speech codecs; speech coding; vector quantisation; channel-dependent distortion measure; channel-matched multistage vector quantizer; channel-optimized multistage vector quantization; joint source-channel coding; line spectral frequencies; signal source; spectral distortion; speech codec; speech coding; speech signal; stage codebooks; Algorithm design and analysis; Communication channels; Decoding; Distortion measurement; Frequency measurement; Helium; Signal design; Speech codecs; Speech coding; Vector quantization;
Journal_Title :
Signal Processing Letters, IEEE
DOI :
10.1109/LSP.2003.819355
