Low-delay code-excited linear-predictive coding of wideband speech at 32 kbits/sec
US5235669A · kind A · utility
28Cited by
8References
20Claims
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Key dates
| Filing date | Jun 29, 1990 |
| Grant date | Aug 10, 1993 |
| Priority date | — |
| Expiry date | Jun 29, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L25/15
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An improved digital communication system, e.g., a CELP code/decoder based system, is improved for use with a wide-band signal such as a high-quality speech signal by modifying the noise weighting filter used in such systems to include a filter section which affects primarily the spectral tilt of the weighting filter in addition to a filter component reflecting formant frequency information in the input signal. Alternatively, the weighting is modified to reflect perceptual transform techniques.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.