Title :
800-b/s voice encoding algorithm
Author :
Kang, George S. ; Fransen, Lawrence J.
Author_Institution :
US Naval Res. Lab., Washington, DC, USA
Abstract :
The authors present an 800-b/s voice encoding algorithm which is an extension of the 2400-b/s LPC (linear predictive coder). In essence, the 800-b/s voice algorithm is a 2400-b/s LPC with modified parameter encoders. Speech intelligibility of the 800-b/s voice encoding algorithm measured by the diagnostic rhyme test is 91.5 for three male speakers evaluated by impartial listeners not associated with the present R&D effort. This score compares favorably with the 2400-b/s LPC of a few years ago. The factors that most contributed to the high intelligibility are choice of a 20-ms frame, vector quantization of amplitude parameters, and matrix quantization of LSP coefficients, both over two consecutive frames
Keywords :
linear predictive coding; speech coding; speech intelligibility; vector quantisation; 20 ms; 2400 bit/s; 800 bit/s; LPC; LSP coefficients; amplitude parameters; diagnostic rhyme test; linear predictive coder; matrix quantization; speech intelligibility; vector quantization; voice encoding algorithm; Decoding; Degradation; Encoding; Filters; Laboratories; Linear predictive coding; Narrowband; Protection; Speech analysis; Speech coding;
Conference_Titel :
Tactical Communications Conference, 1992. Vol. 1 Tactical Communications: Technology in Transition., Proceedings of the
Conference_Location :
Fort Wayne, IN
Print_ISBN :
0-7803-0745-3
DOI :
10.1109/TCC.1992.247165
