Name
Abstract | ||
|---|---|---|
An algorithm for coding speech at 2.4 kbps is presented. By combining in a new way well-known coding strategies from both medium and low bit rate speech coding, a very promising configuration is developed. The coder is fundamentally a baseband coder where short-term correlation is predicted by LPC (linear predictive coding) analysis. Coding of the short-term parameters is performed by vector quantization. An open-loop long-term predictor is applied to the lowpass filtered short-term residual to reduce the quasi-periodic pitch structure before the signal is down-sampled. A novel method for coding the down-sampled residual based on voiced/unvoiced classification is proposed. For unvoiced frames a simple white Gaussian codebook is applied, and for voiced frames a new pulse codebook has been designed. The coding algorithm is demonstrated to be robust and to produce high speech quality at 2.4 kbps. |
Year | DOI | Venue |
|---|---|---|
1991 | 10.1109/ICASSP.1991.150408 | ICASSP '91 Proceedings of the Acoustics, Speech, and Signal Processing, 1991. ICASSP-91., 1991 International Conference |
Keywords | DocType | ISSN |
data compression,encoding,filtering and prediction theory,speech intelligibility,vocoders,2.4 kbit/s,Gaussian codebook,LPC,baseband coder,coding algorithm,down-sampled residual,linear predictive coding,lowpass filtered short-term residual,open-loop long-term predictor,pulse codebook,short-term correlation,short-term parameters,speech coder,speech coding,speech quality,unvoiced frames,vector quantization,voiced frames,voiced/unvoiced classification | Conference | 1520-6149 |
ISBN | Citations | PageRank |
0-7803-0003-3 | 1 | 0.70 |
References | Authors | |
3 | 3 | |
Name | Order | Citations | PageRank |
|---|---|---|---|
| Haagen, J. | 1 | 1 | 0.70 |
| Nielsen, H. | 2 | 1 | 0.70 |
| Hansen, S.D. | 3 | 1 | 0.70 |