Interlace inversion detector for a picture-in-picture video sign

Details Interlace inversion detector for a picture-in-picture video sign Interlace inversion detector for a picture-in-picture video sign

1987-02-17

1988-02-09

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 22, H04N 5272, H04N 5262

Patent

active

047244879

ABSTRACT:
A picture-in-picture image signal generator includes a source of an auxiliary video signal and an auxiliary synchronization component separator which produces an auxiliary odd/even field signal. Auxiliary image data is stored in a memory for subsequent retrieval. A source of a main video signal and associated synchronization component separator, which produces a main odd/even field signal, is also provided. A signal combiner combines a portion of the main video signal with data retrieved from the memory to form a picture-in-picture video signal. An interlace inversion detector generates a signal indicating an interlace inversion condition in response to the main and auxiliary odd/even field signals. A correction to the interlacing is made in response to the interlace inversion signal.

REFERENCES:
patent: 4249213 (1981-02-01), Imaide et al.
patent: 4267560 (1981-05-01), Ishikawa et al.
patent: 4347532 (1982-08-01), Korver
patent: 4623915 (1986-11-01), Bolger
patent: 4656515 (1987-04-01), Christopher
patent: 4656516 (1987-04-01), Fling et al.
patent: 4665438 (1987-05-01), Miron et al.
patent: 4682234 (1987-07-01), Naimpally
"LM1881 Video Sync Separator"; National Semiconductor, Preliminary, Apr. 1986.

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