Title :
Speech codec for the European mobile radio system
Author :
Hellwig, K. ; Vary, P. ; Massaloux, D. ; Petit, J.P. ; Galand, C. ; Rosso, M.
Author_Institution :
Philips Kommunikations Ind., Nuernberg, West Germany
Abstract :
The speech coding scheme which will be used as the standard for the European mobile radio system has been selected by the CEPT Groupe Special-Mobile (GSM) as a result of formal subjective listening tests. It is based on the regular-pulse excitation linear predictive coding technique (RPE-LPC) combined with long-term prediction (LTP). The solution is called the RPE-LTP codec. The codec algorithm and the error protection scheme are presented. The net bit rate is 13.0 kb/s, and the gross bit rate, including error protection, is 22.8 kb/s. The experimental implementation based on VLSI signal processors is described. The speech quality obtained with the technique considered is far superior to that obtainable with present-day analog mobile radio systems. A duplex speech codec including error protection can be implemented with two VLSI sign processors with external data memories of about 1 K×16 b
Keywords :
cellular radio; codecs; digital radio systems; error correction; radiotelephony; speech analysis and processing; voice communication; 13 kbit/s; 16 kbit; 22.8 kbit/s; CEPT; European mobile radio system; GSM; Groupe Special-Mobile; LPD; RPE-LTP codec; VLSI signal processors; duplex speech codec; error protection scheme; external data memories; linear predictive coding; long-term prediction; regular-pulse excitation; speech coding scheme; speech quality; standard; Bit rate; GSM; Land mobile radio; Linear predictive coding; Protection; Signal processing algorithms; Speech codecs; Speech coding; System testing; Very large scale integration;
Conference_Titel :
Global Telecommunications Conference and Exhibition 'Communications Technology for the 1990s and Beyond' (GLOBECOM), 1989. IEEE
Conference_Location :
Dallas, TX
DOI :
10.1109/GLOCOM.1989.64121
