Title :
Constant delay and rate coding of speech spectral envelope at 11 bits/frame
Author :
Yakhnich, Evgeni ; Bistritz, Yuval
Author_Institution :
Dept. of Electr. Eng., Univ. of Tel-Aviv, Israel
Abstract :
Parametric vocoders are used to attain very low rate compression. A new method for segment coding of a speech spectral envelope is proposed, based on coding of constant length segments. It is a computationally efficient method for LPC (linear predictive coding) parameter coding based on TD (temporal decomposition). It attains average LSD (log-spectrum distortion) less than 1 dB at 11 bits/frame. Thus, it saves 56% of the LPC parameter bit budget which is 26% of the total NELP2400 vocoder bit budget. The method offers constant delay and relatively low complexity.
Keywords :
data compression; linear predictive coding; speech codecs; speech coding; vocoders; LPC parameter bit budget; LSD; NELP2400 vocoder bit budget; TD; computationally efficient LPC parameter coding; linear predictive coding; log-spectrum distortion; low complexity coding; speech spectral envelope constant delay/rate coding; speech spectral envelope segment coding; temporal decomposition; very low rate compression parametric vocoders; Bit rate; Delay; Frequency; Interpolation; Linear predictive coding; Predictive models; Quantization; Speech coding; Vectors; Vocoders;
Conference_Titel :
Electrical and Electronics Engineers in Israel, 2002. The 22nd Convention of
Print_ISBN :
0-7803-7693-5
DOI :
10.1109/EEEI.2002.1178441
