Process for multirate encoding signals and device for implementing said process
US4912763A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 24, 1987 |
| Grant date | Mar 27, 1990 |
| Priority date | — |
| Expiry date | Sep 24, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/667
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A process for multirate subband encoding voice signals. At least a portion of the original signal bandwidth is split into p sub-bands the contents of which are to be coded using dynamic allocation of quantizing levels throughout the sub-bands. Let's assume the signal is to be coded for a set of coding rates R(1) <R(2)<. . .<R(k) . . . <R(K). First the number of quantizing levels 1(i, R(1)) for the lowest rate is determined. Then the levels for 1(i, R(k)), k=2, . . . , p are determined using: ##EQU1## Then the sub-band samples S(i,j) are quantized according to 1(i, R(K). Finally, the quantized sub-band samples are embedded into a multirate frame.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.