Controlled adaptive prediction delta modulation in mobile radio voice communications.

Chia-Chi Huang*

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

Abstract

Controlled adaptive prediction delta modulation (CAPDM) is a median-rate (ca. 15 kb/s) speech coding scheme which combines the features of one-step looking forward decisions, syllabic companding, instantaneous companding, and adaptive prediction. Its parameters can be adjusted such that it achieves high-quality voice transmission under good channel conditions and achieves communication-quality voice transmission under bursty-type channel errors in mobile radio environments. From the results of large-scale computer simulation and subjective listening tests, it was found that CAPDM performs much better than continuously variable slope delta (CVSD) modulation in a mobile radio fading channel.

Original languageEnglish
Pages (from-to)158-162
Number of pages5
JournalIEEE Vehicular Technology Conference
DOIs
StatePublished - 1 Dec 1988

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