Signal expander
US4220929A · kind A · utility
18Cited by
2References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 26, 1978 |
| Grant date | Sep 2, 1980 |
| Priority date | — |
| Expiry date | Dec 26, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G7/002
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An improved signal expansion system and technique is disclosed. The system comprises a detector for sensing an input signal and for producing responsively thereto a D.C. control signal having an amplitude as a function of the input signal, and a gain control amplifier for amplifying the input signal, the amplifier including means for controlling the gain of the amplifier as a function of the amplitude of the control signal. The improvement comprises means for varying the amplitude of the D.C. signal at least in part as a function of the time derivative of that amplitude.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.