Title :
A 16, 24, 32 kbit/s wideband speech codec based on ATCELP
Author :
Combescure, Pierre ; Schnitzler, Jurgen ; Fischer, Kyrill ; Kircherr, R. ; Lamblin, Claude ; Le Guyader, Alain ; Massalaux, D. ; Quinquis, Catherine ; Stegmann, Joachim ; Vary, Peter
Author_Institution :
Aachen Univ. of Technol., Germany
Abstract :
This paper describes a combined adaptive transform codec (ATC) and code-excited linear prediction (CELP) algorithm, called ATCELP, for the compression of wideband (7 kHz) signals. The CELP algorithm applies mainly to speech, whereas the ATC mode is selected for music and noise signals. We propose a switching scheme between CELP and ATC mode and describe a frame erasure concealment technique. Subjective listening tests have shown that the ATCELP codec at bit rates of 16, 24 and 32 kbit/s achieved performances close to those of the CCITT G.722 at 48, 56 and 64 kbit/s, respectively, at most operating conditions
Keywords :
adaptive codes; linear predictive coding; speech codecs; speech coding; transform coding; 16 kbit/s; 24 kbit/s; 32 kbit/s; ATCELP; CCITT G.722; CELP algorithm; adaptive transform codec; code-excited linear prediction; frame erasure concealment technique; music signals; noise signals; subjective listening tests; switching scheme; wideband speech codec; Bit rate; Decoding; Filter bank; Multiple signal classification; Signal synthesis; Speech codecs; Speech coding; Speech enhancement; Testing; Wideband;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1999. Proceedings., 1999 IEEE International Conference on
Conference_Location :
Phoenix, AZ
Print_ISBN :
0-7803-5041-3
DOI :
10.1109/ICASSP.1999.758048
