Signal dynamic compression and expansion circuits
US4035739A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 15, 1976 |
| Grant date | Jul 12, 1977 |
| Priority date | — |
| Expiry date | Jun 15, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G7/002
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
In a circuit for the automatic dynamic compression or expansion of a signal between its input and its output, the circuit presenting a useful signal path connected between its input and its output and connecting a first variable gain member which is electronically controllable for varying the transmission factor between the circuit input and output, the circuit also presenting a branch path connected at one point to the useful signal path and containing a second variable gain member which is electronically controllable for varying the transmission factor exhibited by the branch path, and a control voltage generator for generating a control voltage applied to control the variable gain members for effecting a counterregulation of the transmission factor of the branch path, relative to the transmission factor variation imparted to the useful signal path, there is further provided a combining circuit which receives the output signal from the second variable gain member and a signal proportional to a signal at a point in the useful signal path and which applies to the control voltage generator a control signal dependent on the difference between the signals received by the combining cir…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.