Compression and expansion of digitized voice signals
US4631746A · kind A · utility
41Cited by
0References
34Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 14, 1983 |
| Grant date | Dec 23, 1986 |
| Priority date | — |
| Expiry date | Feb 14, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L21/04
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Speech signal data compression is improved by a first compression using Time Domain Harmonic Scaling (TDHS), wherein two periods of voiced data are averaged together, followed by a second compression using Continuously Variable Slope Delta Modulation (CVSD). Pitch period detection and sampling-rate conversion are also features of the invention.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.