Feedback comb-type filter
US4684976A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 15, 1986 |
| Grant date | Aug 4, 1987 |
| Priority date | — |
| Expiry date | Apr 15, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/21
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
This invention relates to a feedback comb-type filter used for improving the S/N ratio of video signals and so constructed as to delay the output of a coefficient multiplier and to get a feedback delay signal contrary to the conventional one which gives to the coefficient multiplier the filter output, that is, the signal to be output to the exterior, thereby enabling to improve the S/N ratio only by varying the coefficient of the coefficient multiplier, also constructed to be able to cut off the feedback delay signal to suppress generation of pseudo signal and use one low pass filter for both the delay circuit and the limit of horizontal frequency band to reduce the components in number, thereby expecting improvements in accuracy and reliability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.