Title :
Controlled adaptive prediction delta modulation in mobile radio voice communications
Author_Institution :
General Electric Co., Schenectady, NY, USA
Abstract :
Controlled adaptive prediction delta modulation (CAPDM) is a median-rate (~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
Keywords :
delta modulation; mobile radio systems; speech analysis and processing; 15 kbit/s; CAPDM; CVSD; adaptive prediction; adaptive prediction delta modulation; continuously variable slope delta; fading channel; instantaneous companding; mobile radio voice communications; one-step looking forward decisions; speech coding; syllabic companding; voice transmission; Adaptive control; Communication system control; Computer errors; Delta modulation; Land mobile radio; Large-scale systems; Mobile communication; Programmable control; Radio control; Speech coding;
Conference_Titel :
Vehicular Technology Conference, 1988, IEEE 38th
Conference_Location :
Philadelphia, PA
DOI :
10.1109/VETEC.1988.195352
