Compander
US4306202A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 19, 1980 |
| Grant date | Dec 15, 1981 |
| Priority date | — |
| Expiry date | Mar 19, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G9/025
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Circuit for automatic dynamic compression an/or expansion. The circuit has adjusting member (10) for varying the propagation constant in a useful signal path and a further similar adjusting member (30) for varying the propagation constant in a branch path which serves for deriving a control voltage which is applied to the control inputs (11,31) of the adjusting members (10,30) in the useful signal path and in the branch path. Further the circuit has a lowpass circuit (20 . . . 26) which is connected to the adjusting member (10) located in the useful signal path. The circuit can be changed over to a different compander characteristic when the adjusting member (10) located in the useful signal path is connected up as a controllable highpass (10,15). The limiting frequency is of the order of magnitude of the limiting frequency of the lowpass circuit (20 . . . 26). The highpass can be formed by a capacitor (15) in series with the adjusting member (10) in the useful signal path and the highpass function for low frequencies can be limited by a resistor (12) in parallel with the adjusting member (10) and the capacitor (15). The limiting frequency of the lowpass circuit (20 . . . 26) is re…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.