Noise reduction circuit having voltage to current converting means in the auxiliary channel
US4462008A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 20, 1982 |
| Grant date | Jul 24, 1984 |
| Priority date | — |
| Expiry date | Dec 20, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G11/002
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
In a noise reduction circuit comprising a combining circuit which generates a combined signal in response to signals supplied thereto, a main channel which supplies an information signal substantially unchanged to the combining circuit, and an auxiliary channel which receives the information signal and which supplies a modified information signal to the combining circuit for combining with the unchanged information signal, the auxiliary channel includes a high pass filter with a variable cut-off frequency which generates a filtered output signal in response to the information signal supplied thereto, a voltage-current converting circuit which converts the voltage level of the filtered output signal to a current and which supplies the current to the combining circuit, and an amplitude limiting circuit which limits the amplitude of the current supplied to the combining circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.