Efficient codebook search for CELP vocoders
US5187745A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 27, 1991 |
| Grant date | Feb 16, 1993 |
| Priority date | — |
| Expiry date | Jun 27, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L2019/0014
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A new way of determining correlation coefficients for stochastic codebook vectors for CELP coding of speech takes advantage of the sparsely populated nature of stochastic codebook vectors. N valued input signals (e.g., convolution vectors) to be correlated with N valued codebook vectors are fed to an N by N multiplexer or other selection means and the signal values either passed to an accumulator or not according to the state of N select inputs or other identification means determined from a memory store (e.g., an EPROM) whose entries correspond to the non-zero values of the codebook vectors. The accumulator output is the correlation of the codebook vector with the input signal. A sequencer steps through the entire codebook to provide correlation values for each vectors. The results are used to determine the optimum stochastic codebook vector for replicating the particular speech frame being analyzed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.