Circuit for reducing noise in a carrier chrominance signal
US4558353A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 8, 1983 |
| Grant date | Dec 10, 1985 |
| Priority date | — |
| Expiry date | Mar 8, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/646
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A noise reducing circuit for reducing noise in a carrier chrominance signal comprises a bandpass filter supplied with an input carrier chrominance signal, where the bandpass filter has a narrow-band pass band of a center frequency equal to a chrominance subcarrier frequency of the input carrier chrominance signal, a first subtracting circuit supplied with the input carrier chrominance signal and an output signal of the bandpass filter, for carrying out subtraction between the two signals supplied thereto to obtain a noise signal component within the input carrier chrominance signal, an amplitude limiter for limiting the amplitude of an output signal of the first subtracting circuit, and a second subtracting circuit supplied with the input carrier chrominance signal and an output signal of the amplitude limiter, for carrying out subtraction between the two signals supplied thereto to produce a carrier chrominance signal reduced of the noise signal component.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.