NDLI: A 16 kbit/s wideband CELP coder with a high-order backward predictor and its fast coefficient calculation

Content Provider	IEEE Xplore Digital Library
Author	Serizawa, M. Murashima, A. Ozawa, K.
Copyright Year	1997
Description	Author affiliation: C&C Inf. Technol. Res. Labs., NEC Corp., Kawasaki, Japan (Serizawa, M.)
Abstract	This paper proposes a 16 kbit/s wideband CELP coder with a high-order backward predictor and its fast coefficient calculation method. The coefficients are calculated from autocorrelations of the residual signal. The proposed calculation scheme approximately calculates the autocorrelations of the residual signal from those of the decoded output signal. Therefore, an inverse filtering of the decoded output signal and a calculation for the autocorrelations of the residual signal are not necessary, and the complexity for the backward prediction is drastically reduced. The proposed coder also adopts a multi-pulse vector quantization to efficiently represent an excitation signal as well as a multi-mode coding to enhance the performance and the channel error robustness. An MOS test shows that the proposed coder achieves superior performance for speech to that of ITU-T G.722 at 56 kbit/s and comparable performance for audio to that of G.722 at 48 kbit/s.
Starting Page	107
Ending Page	108
File Size	210777
Page Count	2
File Format	PDF
ISBN	0780340736
DOI	10.1109/SCFT.1997.623919
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-09-07
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Wideband Decoding Autocorrelation Signal analysis Multiple signal classification Speech analysis Vector quantization Testing Bit rate Periodic structures
Content Type	Text
Resource Type	Article

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