The effect of waveform substitution on the quality of PCM packet communications

Author

Wasem, O.J. ; Goodman, D.J. ; Dvorak, C.A. ; Page, Howard G.

Author_Institution

Dept. of Electr. Eng. & Comput. Sci., MIT, Cambridge, MA, USA

Volume

36

Issue

3

fYear

1988

fDate

3/1/1988 12:00:00 AM

Firstpage

342

Lastpage

348

Abstract

Missing packets are a major cause of impairment in packet voice networks. While it is easiest to allow these gaps in received speech to appear as silent intervals in reconstructed speech, speech quality is improved by filling the gaps with estimates of the transmitted waveform. Several estimation techniques have been investigated for packets containing 16 ms of speech in a pulse-code-modulation format. The simplest method, packet repetition, extends from 2% to 5%, the acceptable ratio of missing packets. Here, acceptability is defined as a mean opinion score midway between fair and good on a five-point opinion scale. The most effective estimation technique (although not the most complex) is pitch waveform replication. It extends the acceptable ratio of missing packets to 10%

Keywords

packet switching; pulse-code modulation; speech analysis and processing; voice communication; 16 ms; PCM packet communications; estimation techniques; mean opinion score; packet voice networks; pulse-code-modulation format; reconstructed speech; speech quality; waveform substitution; Data communication; Filling; Pattern matching; Phase change materials; Pulse modulation; Signal processing; Speech coding; Speech processing; Telecommunication traffic; Traffic control;

fLanguage

English

Journal_Title

Acoustics, Speech and Signal Processing, IEEE Transactions on

Publisher

ieee

ISSN

0096-3518

Type

jour

DOI

10.1109/29.1530

Filename

1530