System for transmitting a coded voice signal
US4012595A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 12, 1974 |
| Grant date | Mar 15, 1977 |
| Priority date | — |
| Expiry date | Jun 12, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J3/1688
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A system for transmitting a coded voice signal representative of an original analogue voice signal, for improved performance in time assignment multiplex systems. A voice signal detector detects when the magnitude of the coded voice signal exceeds a certain predetermined value which corresponds to the presence of an original voice signal. A waveform analyzer estimates high frequency components of the original voice signal and the detected coded voice signal is transmitted at intervals determined by the measured values of the high frequency components. The transmitted coded voice signal is comprised of digital code units, and the number of bits in each code unit are reduced at low transmission speed by distributing the bits of the code units between more than one transmission interval.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.