Instantaneous compressor and instantaneous expandor
US4309676A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 10, 1980 |
| Grant date | Jan 5, 1982 |
| Priority date | — |
| Expiry date | Sep 10, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/64
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An instantaneous compressor and an instantaneous expandor both of which use the logarithmic characteristics of diodes to provide compression and expansion, respectively, of uncompressed analog PAM signals and compressed analog PAM signals. Both the compressor and expandor also include circuitry having a temperature dependent gain characteristic. The signal at the compressor output is a temperature independent compressed analog signal which follows the compressor's logarithmic encoding characteristic. The signal at the output of the expandor is a temperature independent uncompressed analog signal which is substantially identical to the analog signal at the compressor input.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.