Synchronizing circuit

Details Synchronizing circuit Synchronizing circuit

1991-09-03

1994-06-07

Barron, Jr., Gilberto

Cryptography

Cryptanalysis

380 15, 360 60, 348521, 348533, H04N 506, H04N 7093

Patent

active

053197062

ABSTRACT:
When a specific signal (such as copy guard signal) is added between horizontal synchronizing signals in a composite synchronizing signal, and the addition period of the specific signal is defined in a specific period on the basis of the vertical synchronizing signal, the composite synchronizing signal is masked to remove the specific signal, thereby obtaining a masked composite synchronizing signal. Afterwards, from the masked composite synchronizing signal, the horizontal synchronizing signal and vertical synchronizing signal are obtained. In the case of composite synchronizing signal containing noise, without masking, the horizontal synchronizing signal and vertical synchronizing signal are directly obtained from the composite synchronizing signal. Therefore, when noise is not present, the horizontal synchronizing signal and vertical synchronizing signal may be obtained without disturbing the video image.

REFERENCES:
patent: 4670904 (1987-06-01), Rumreich
patent: 4672440 (1987-06-01), Trahan
patent: 4695901 (1987-09-01), Ryan
patent: 4817142 (1989-03-01), van Rassel
patent: 4870297 (1989-09-01), Karlock

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