DocumentCode :
2959956
Title :
CELP coding at 6.55 kbit/s for digital mobile radio communications
Author :
Drogo De Iacovo, R. ; Sereno, Daniele
Author_Institution :
Centro Studi e Lab. Telecomun. SpA, Torino, Italy
fYear :
1990
fDate :
2-5 Dec 1990
Firstpage :
538
Abstract :
The work carried out in designing a speech codec suitable for the half-rate channel of the pan-European digital mobile radio (DMR) system is described. A set of CELP (code-excited linear prediction) schemes was selected with bit-rates around 7 kb/s, on the basis of performance without channel errors and complexity. Then the selection of a single scheme was made, taking into account performance with channel errors. The effect of transmission errors was evaluated by measuring the spectral distortion and the segmental signal-to-noise ratio (SNR) for each corrupted bit of the encoded parameters. These data, combined with informal listening tests, resulted in the definition of classes of importance for the bits. The bit error rate (BER) thresholds at which the distortion, due to errors, is perceived were determined for each class. This information was used to optimize the design of a channel coder for the selected speech coder
Keywords :
cellular radio; codecs; digital radio systems; encoding; filtering and prediction theory; speech analysis and processing; 6.55 to 7.45 kbit/s; BER thresholds; CELP coding; GSM; Groupe Speciale Mobile; SNR; bit error rate; cellular radio; channel coder; channel errors; code-excited linear prediction; digital mobile radio communications; encoded parameters; half-rate channel; informal listening tests; pan-European radio; segmental signal-to-noise ratio; spectral distortion; speech codec; transmission errors; Bit error rate; Bit rate; Design optimization; GSM; Land mobile radio; Mobile communication; Protection; Speech codecs; Testing; Time division multiple access;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Global Telecommunications Conference, 1990, and Exhibition. 'Communications: Connecting the Future', GLOBECOM '90., IEEE
Conference_Location :
San Diego, CA
Print_ISBN :
0-87942-632-2
Type :
conf
DOI :
10.1109/GLOCOM.1990.116569
Filename :
116569
Link To Document :
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