DocumentCode :
2202343
Title :
New rate distortion bounds for speech coding based on composite source models
Author :
Gibson, Jerry D. ; Hu, Jing ; Ramadas, Pravin
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of California, Santa Barbara, CA, USA
fYear :
2010
fDate :
Jan. 31 2010-Feb. 5 2010
Firstpage :
1
Lastpage :
5
Abstract :
We present new rate distortion bounds for speech coding based upon new composite source models for speech and conditional rate distortion theory. The composite source models are constructed by classifying each sentence as Voiced (V), Unvoiced (UV), Onset (ON), Hangover (H), and Silence (S). A 10th order AR model is used for the V mode, 4th order AR models are used for the ON and H modes, and the UV mode is modeled as uncorrelated. Marginal rate distortion functions are computed for each mode and combined to produce conditional rate distortion bounds based on unweighted and weighted mean squared error distortion measures. For unweighted distortion measures, the new bounds imply that good performance is attainable at rates as low as 0.25 bits/sample for narrowband speech.
Keywords :
rate distortion theory; speech coding; composite source models; narrowband speech; rate distortion bounds; speech coding; unweighted distortion; Digital signal processing; Distortion measurement; Mathematical model; Narrowband; Predictive models; Rate distortion theory; Rate-distortion; Speech codecs; Speech coding; Speech processing; composite source models for speech; rate distortion bounds for speech; speech codec performance;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Information Theory and Applications Workshop (ITA), 2010
Conference_Location :
San Diego, CA
Print_ISBN :
978-1-4244-7012-9
Electronic_ISBN :
978-1-4244-7014-3
Type :
conf
DOI :
10.1109/ITA.2010.5454133
Filename :
5454133
Link To Document :
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