Name
Abstract | ||
|---|---|---|
A novel paradigm based on pitch-adaptive windows is proposed for solving the problem of encoding the fixed codebook excitation in low bit-rate CELP coders. In this method, the nonzero excitation in the fixed codebook is substantially localized to a set of time intervals called windows. The positions of the windows are adaptive to the pitch peaks in the linear prediction residual signal. Thus, high coding efficiency is achieved by allocating most of the available FCB bits to the perceptually important segments of the excitation signal. The pitch-adaptive method is adopted in the design of a novel multimode variable-rate speech coder applicable to CDMA-based cellular telephony. Results demonstrate that the adaptive windows method yields excellent voice quality and intelligibility at average bit-rates in the range of 2.5-4.0 kbps. |
Year | DOI | Venue |
|---|---|---|
2003 | 10.1109/TSA.2003.815530 | IEEE Transactions on Speech and Audio Processing |
Keywords | Field | DocType |
cellular radio,code division multiple access,linear predictive coding,speech coding,variable rate codes,vocoders,CDMA-based cellular telephony,algebraic codebook,code excited linear prediction coders,coding efficiency,excitation coding,fixed codebook excitation,linear prediction residual signal,multimode variable-rate speech coder,pitch adaptive windows,speech coding,variable-rate coding,voice intelligibility,voice quality | Speech processing,Algorithmic efficiency,Speech coding,Code-excited linear prediction,Computer science,Linear prediction,Speech recognition,Linear predictive coding,Codebook,Intelligibility (communication) | Journal |
Volume | Issue | ISSN |
11 | 6 | 1063-6676 |
Citations | PageRank | References |
6 | 0.63 | 11 |
Authors | ||
4 | ||
Name | Order | Citations | PageRank |
|---|---|---|---|
| Rao, A.V. | 1 | 6 | 0.63 |
| Ahmadi, S. | 2 | 7 | 1.03 |
| Linden, J. | 3 | 6 | 0.63 |
| Allen Gersho | 4 | 2031 | 624.48 |