Automatic peaking circuit
US4075661A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 19, 1976 |
| Grant date | Feb 21, 1978 |
| Priority date | — |
| Expiry date | Aug 19, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/205
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An apparatus is described for automatically restoring the loss of high frequency components in the luminance signal of a television receiver. The luminance signal is continuously sampled and a signal representing the high frequency content in the luminance signal is used to alter the frequency characteristics of the luminance signal path so as to maintain the frequency spectrum of the luminance signal substantially constant. Additionally, the frequency alteration of the luminance signal path is made responsive to the dynamic level of the video signal to provide increased peaking in the gray picture areas relative to the higher level whites. The system also functions to reduce the upper video spectrum noise level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.