Title :
Variable frame rate speech coding using optimal interpolation
fDate :
6/1/1994 12:00:00 AM
Abstract :
A VFR LPC vocoder using optimal interpolation is presented in this paper. In the encoder, some representative frames of an utterance are selected for transmission. In the decoder, LPC parameters of all untransmitted frames are restored by optimal interpolation. Simulation results show that this coding scheme outperforms the conventional VFR vocoder using linear interpolation. By incorporating contour quantization of gain and pitch information, a low variable-rate LPC vocoder is realized. An informal listening test shows that very high intelligible reconstructed speech was obtained at an average data rate of 300 bps
Keywords :
interpolation; linear predictive coding; speech coding; speech intelligibility; vector quantisation; vocoders; 300 bit/s; LPC parameters; LPC vocoder; average data rate; contour quantization; encoder; gain information; informal listening test; intelligible reconstructed speech; optimal interpolation; pitch information; simulation results; speech coding; variable frame rate; Decoding; Feature extraction; Interpolation; Linear predictive coding; Oral communication; Quantization; Speech coding; Speech processing; Testing; Vocoders;
Journal_Title :
Communications, IEEE Transactions on
