DocumentCode
3038674
Title
8 kbps voice transmission by SPAC
Author
Suzuki, Jouji ; Yoshiya, Kiyosumi
Author_Institution
Radio Research Laboratories, Koganei, Tokyo, Japan
Volume
4
fYear
1979
fDate
28946
Firstpage
562
Lastpage
565
Abstract
A speech Processing system named SPAC (Speech Processing system by use of AutoCorrelation function) can successfully compress or expand the speech spectrum and reduce the noise level superposed on speech signal. By employing these functions of SPAC, three types of low-bit-rate transmission system, which bit rate is 8 or 10 kbps, have been proposed. These are zero-crossing+SPAC, ADM+SPAC, and band-compression and -expansion by SPAC (compression ratio : 3). Evaluation by hearing tests is made on these sytems, zero-crossing and ADM. It is shown that ADM+SPAC with 8 kbps can transmit natural and acceptable speech.
Keywords
Acoustic noise; Auditory system; Autocorrelation; Bit rate; Gaussian noise; Noise level; Noise reduction; Signal processing; Speech enhancement; Speech processing;
fLanguage
English
Publisher
ieee
Conference_Titel
Acoustics, Speech, and Signal Processing, IEEE International Conference on ICASSP '79.
Type
conf
DOI
10.1109/ICASSP.1979.1170816
Filename
1170816
Link To Document