Television ghost signal detection during the video information i

Details Television ghost signal detection during the video information i Television ghost signal detection during the video information i

1981-12-07

1983-11-01

Orsino, Jr., Joseph A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358905, 375101, 455 65, H04N 521

Patent

active

044132824

ABSTRACT:
A method and apparatus are presented for detecting the presence of ghost signal contamination of a video signal by examining the picture information interval of the video signal. A baseband video signal is detected and examined to detect signal transitions. Transitions of the main video signal of a given polarity will be followed by corresponding transitions of a ghost signal. The time intervals between ones of the transitions are measured and stored. If a ghost signal is present, the time interval between corresponding ghost and signal transitions will occur more frequently than the relatively random time intervals between transitions of the main signal and the ghost signal considered separately. By correlating the time interval measurements, the recurring time interval between corresponding main and ghost signal transitions can be identified. This information may then be used to adjust the delay of a delay line in a ghost cancellation system.

REFERENCES:
patent: 4216496 (1980-08-01), Lothian et al.
The Dick-Adaptive Multipath Equalization for TV Broadcasting, IEEE Transactions on Consumer Electronics, vol. CE 23, #2, May 1977, pp. 175-181.
"A Fully Automatic Ghost Canceller" by S. Makino et al., IEEE Transactions on Consumer Electronics, vol. CE-24, No. 3, Aug. 1978, pp. 267-271.

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