Ghost-cancelation reference signal acquisition circuitry, as for

Details Ghost-cancelation reference signal acquisition circuitry, as for Ghost-cancelation reference signal acquisition circuitry, as for

1994-04-15

1997-02-04

Lee, Micheal H.

Television

Image signal processing circuitry specific to television

Noise or undesired signal reduction

H04N 521, H04N 5213

Patent

active

056003803

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 GCR signals. A field counter counts the vertical synchronizing pulses modulo M, generating a field count synchronized to the cycle of M. GCR signals. A temporal filter combines M.times.N successive scan lines to generate a temporal filter response supplied to the computer as a noise-reduced GCR signal with attendant ghosts.

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