Variable rate speech coding for asynchronous transfer mode

Author

Nakada, Hiroshi ; Sato, Ken-Ichi

Author_Institution

NTT Transmission Syst. Lab., Kanagawa, Japan

Volume

38

Issue

3

fYear

1990

fDate

3/1/1990 12:00:00 AM

Firstpage

277

Lastpage

284

Abstract

A new speech coding and multiplexing scheme matched to the asynchronous transfer mode is described. A block coding technique that is based on a variable-rate coding algorithm that makes the most of the burstiness of voice information is employed. The main feature of the scheme is considerable bit reduction, which is attained by a fairly simple algorithm. It is demonstrated that the proposed algorithm exhibits better quality than that of a 32 kb/s ADPCM at a mean bit rate of less than 13 kb/s. The effect of statistical multiplexing is verified by means of simulation employing long conversational speech samples. Methods for constructing variable- and fixed-length frames (units of information multiplexed and transferred in the network) are proposed. The proposed coding algorithm is shown to be applicable to both variable- and fixed-length frame strategies

Keywords

encoding; multiplexing; speech analysis and processing; ATM; asynchronous transfer mode; bit reduction; block coding technique; burst coder; conversational speech; fixed-length frames; multiplexing scheme; speech coding; statistical multiplexing; variable length frames; variable-rate coding algorithm; voice information; Asynchronous transfer mode; Bit rate; Block codes; Computer simulation; Economic forecasting; Intserv networks; Packet switching; Speech coding; Speech processing; Transportation;

fLanguage

English

Journal_Title

Communications, IEEE Transactions on

Publisher

ieee

ISSN

0090-6778

Type

jour

DOI

10.1109/26.48884

Filename

48884