Speech coding transmission equipment
US4890325A · kind A · utility
22Cited by
3References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 18, 1988 |
| Grant date | Dec 26, 1989 |
| Priority date | — |
| Expiry date | Feb 18, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/662
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Speech is data-compressed and coded for transmission using TDHC (Time Domain Harmonic Compression) for the voiced signal, and decimated sampling for the unvoiced signal. Features include voiced/unvoiced detection, pitch period detection, border detection, coding by ADPCM, and optimum quantization coding. Reception involves decoding and data-reconstruction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.