Title :
Packet speech transmission on ATM networks using a variable rate embedded ADPCM coding scheme
Author :
Kondo, Kazuhiro ; Ohno, Masashi
Author_Institution :
Central Res. Lab., Hitachi Ltd., Tokyo, Japan
Abstract :
The authors propose a packet speech coding scheme to vary the code bits of an embedded ADPCM coder between 6 bits per sample, for high prediction gain speech blocks, to 2 bits for blocks representing silence. Subjective quality of 3.2 MOS on a scale of 1 to 5 at an enhancement-bit loss rate of 30% was obtained
Keywords :
asynchronous transfer mode; packet switching; pulse-code modulation; speech coding; voice communication; ATM networks; embedded ADPCM coding scheme; enhancement-bit loss rate; high prediction gain speech blocks; least significant bits cell loss; most significant bits cell loss; packet speech transmission; speech coding; subjective quality; variable rate coding; Asynchronous transfer mode; B-ISDN; Decoding; Delay; Layout; Propagation losses; Speech coding; Speech processing; Telecommunication traffic; Testing;
Journal_Title :
Communications, IEEE Transactions on
DOI :
10.1109/TCOMM.1994.577023
