DocumentCode
2991987
Title
A multi-pulse LPC speech codec using digital signal processors
Author
Wake, Y. ; Tanaka, S. ; Ozawa, K. ; Araseki, T.
Author_Institution
NEC Corporation, Tokyo, Japan
Volume
10
fYear
1985
fDate
31138
Firstpage
1429
Lastpage
1432
Abstract
A full-duplex 16 or 9.6 k bits/sec speech codec based on the multi-pulse excited LPC coding technique has been developed. Cross-correlation analysis was used for the pulse search method. The codec was implemented by using five NEC 7720 Digital Signal Processor LSI chips ; four DSPs for the coder and one DSP for the decoder. A general purpose microprocessor was also used for system control. Reconstructed speech was quite natural and almost undiscernible from original speech at 16 k bits/sec and still quite good at 9.6 k bits/sec. Signal to noise power ratio for a sine wave signal was 30 dB at 16 k bits/sec.
Keywords
Control systems; Decoding; Digital signal processing chips; Digital signal processors; Large scale integration; Linear predictive coding; Microprocessors; National electric code; Search methods; Speech codecs;
fLanguage
English
Publisher
ieee
Conference_Titel
Acoustics, Speech, and Signal Processing, IEEE International Conference on ICASSP '85.
Type
conf
DOI
10.1109/ICASSP.1985.1168232
Filename
1168232
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