Effects of packet loss on 3 toll quality speech coders

Author

Choi, A.W. ; Constantinides, A.G.

Author_Institution

Imperial Coll. of Sci. & Technol., London, UK

fYear

1989

fDate

2-5 Apr 1989

Firstpage

380

Lastpage

385

Abstract

The integration of voice and data switching using a packet based approach has been proposed in many forms. If speech coding is used in such a network, impairments such as lost packets affect the coder performance. The effect of packet loss on 3 toll quality speech coders is discussed. The coders are adaptive differential pulse coded modulation (ADPCM), subband coding (SBC) and adaptive predictive coding (APC). Their configurations adopted in the simulations are described. Damage resulting from loss of a speech packet is two-fold: firstly a missing speech segment is introduced for the lost duration; secondly the adaptation logic is disrupted after the lost segment. Therefore any compensation technique should aim to fill the missing segment as well as restoring the adaptation after the loss. The use of side-information was suggested in the case of SBC-APCM. The results showed successful compensation in the case of ADPCM, and SBC

Keywords

data communication equipment; encoding; ferromagnetic-paramagnetic transitions; packet switching; pulse-code modulation; speech analysis and processing; voice communication; ADPCM; APC; SBC; adaptation logic; adaptive differential pulse coded modulation; adaptive predictive coding; compensation technique; data switching; integration; lost duration; packet loss; packet switching networks; side-information; speech coding; speech packet; speech segment; subband coding; toll quality speech coders; voice switching;

fLanguage

English

Publisher

iet

Conference_Titel

Telecommunications, 1989. Second IEE National Conference on

Conference_Location

York

Type

conf

Filename

20740