Title :
Channel-encoded transmission of MELP-compressed speech
Author :
Fazel, Tahereh ; Fuja, Tom
Author_Institution :
Dept. of Electr. Eng., Maryland Univ., College Park, MD, USA
Abstract :
A mixed-excitation linear predictive (MELP) vocoder was previously selected as the U.S. Federal Standard for 2400 bps speech compression. This paper examines novel methods of error control for the new speech coder. In particular, we describe methods for exploiting the residual redundancy in the MELP bitstream; this is done by effecting maximum a posteriori decoding of the channel-encoded MELP bitstream. Examples include a variety of rate-1/2 convolutional codes and suitably-modified “turbo” codes
Keywords :
channel coding; convolutional codes; data compression; decoding; error correction codes; linear predictive coding; redundancy; speech coding; turbo codes; voice communication; 2400 bit/s; MELP bitstream; MELP-compressed speech; U.S. Federal Standard; channel-encoded MELP bitstream; channel-encoded transmission; error control; maximum a posteriori decoding; mixed-excitation linear predictive vocoder; rate-1/2 convolutional codes; residual redundancy; speech coder; speech compression; turbo codes; AWGN; Binary phase shift keying; Convolutional codes; Decoding; Educational institutions; Error correction; Fuels; Redundancy; Speech coding; Vocoders;
Conference_Titel :
Information Theory, 1998. Proceedings. 1998 IEEE International Symposium on
Conference_Location :
Cambridge, MA
Print_ISBN :
0-7803-5000-6
DOI :
10.1109/ISIT.1998.708804
