Television – Image signal processing circuitry specific to television – Noise or undesired signal reduction
Patent
1992-06-01
1994-08-23
Groody, James J.
Television
Image signal processing circuitry specific to television
Noise or undesired signal reduction
H04N 5213
Patent
active
053411773
ABSTRACT:
A ghost-canceling reference signal for inclusion in a television signal is provided by cyclically inserting ones of extended-length complementary-sequence pairs into a prescribed scan line in each of the vertical blanking intervals of successive fields of the television signal. By definition, a pair of binary (.+-.1) sequences of similar length to each other are complementary sequences only if the sum of the linear autocorrelation functions of the sequences is identically zero for all shifts other than zero but provides a high correlation gain at zero shift. A television receiver is described for receiving television signals containing such ghost-canceling reference signals, separating the ghosted complementary-sequence pairs from the received television signals, linearly correlating the ghosted complementary-sequences with corresponding ghost-free complementary-sequences previously stored in the receiver, and adjusting the filtering parameters of ghost-canceling video filters in accordance with the sum of the linear correlation results.
REFERENCES:
patent: 4896213 (1990-01-01), Kobo
patent: 4897725 (1990-01-01), Tanaka
patent: 5111298 (1992-05-01), Koo
patent: 5119196 (1992-06-01), Ayanoglu
Patel Chandrakant B.
Roy Sumit
Yang Jian
Bushnell Robert E.
Groody James J.
Hsia Sherrie
Samsung Electronics Co,. Ltd
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