Ghost-cancelation reference signal acquisition circuitry, as for TV receiver or video recorder
US5600380A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 15, 1994 |
| Grant date | Feb 4, 1997 |
| Priority date | — |
| Expiry date | Apr 15, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/211
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A first composite video signal may include attendant ghosts and sometimes includes in a prescribed L.sup.th line of each field during the vertical blanking interval one of a cycle of M ghost-canceling reference (GCR) signals of prescribed magnitude and respective phasing. Filter circuitry generates a second composite video signal in response to the first composite video signal, which is adjusted in response to filter programming signals generated by a computer storing a ghost-free GCR signal. The computer receives a GCR signal with attendant ghosts and compares it to the stored ghost-free GCR signal, thereby carrying out correlation procedures for calculating the filter programming signals. The second composite video signal is a response to the first composite video signal in which the attendant ghosts are lessened. Synchronizing pulses are separated from the composite video signals and a scan line counter counts the horizontal synchronizing pulses, generating a line count, and is reset to an initial line count by each vertical synchronizing pulse. An L.sup.th -line separator responds to the line count for separating the scan lines of the second composite video signal that include …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.