Title :
A wideband codec at 16/24 kbit/s with 10 ms frames
Author :
Salami, R. ; Lefebvre, R. ; Laflamme, C.
Author_Institution :
Dept. of Electr. Eng., Sherbrooke Univ., Que., Canada
Abstract :
This paper describes a wideband speech/audio codec at 16/24 kbit/s with 10 ms frames. The algorithm uses an ACELP model at 16 kbit/s and a switched ACELP/TCX model at 24 kbit/s. Adaptive preemphasis is used to improve the performance at high frequencies and a hybrid forward/backward LP filter is used to improve the performance of stationary signals. Subjective tests showed that for speech signals, the codec performance at 16 and 24 kbit is equivalent to G.722 at 48 and 56 kbit/s, respectively. For music signals, the performance of the codec at 24 kbit/s was equivalent to that of G.722 at 48 kbit/s
Keywords :
adaptive signal processing; audio coding; filtering theory; linear predictive coding; music; speech codecs; speech coding; telecommunication equipment testing; 10 ms; 16 kbit/s; 24 kbit/s; 48 kbit/s; 56 kbit/s; G.722; HF performance; ITU-T; adaptive preemphasis; algorithm; codec performance; frames; hybrid forward/backward LP filter; music signals; speech signals; standardization; stationary signals; subjective tests; switched ACELP/TCX model; wideband speech/audio codec; Adaptive filters; Bit rate; Delay; Frequency; Multiple signal classification; Speech analysis; Speech codecs; Switches; Technological innovation; Wideband;
Conference_Titel :
Speech Coding For Telecommunications Proceeding, 1997, 1997 IEEE Workshop on
Conference_Location :
Pocono Manor, PA
Print_ISBN :
0-7803-4073-6
DOI :
10.1109/SCFT.1997.623917
