Electrical pulse counters – pulse dividers – or shift registers: c – Systems – Counter controlled counter
Patent
1992-04-29
1993-07-06
Heyman, John S.
Electrical pulse counters, pulse dividers, or shift registers: c
Systems
Counter controlled counter
377 54, 377 73, 377116, 377107, H03K 2102, H03K 2138
Patent
active
052260631
ABSTRACT:
The horizontal synchronous signal and the vertical synchronous signal included in a composite synchronous signal which is output from one TV camera are separated from the composite synchronous signal. A plurality of TV cameras are controlled on the basis of the horizontal synchronous signal and the vertical synchronous signal so as to produce synchronized video signals from the plurality of TV cameras. These synchronized video signals are easy to compound. In the blanking period of the vertical synchronous signal, the rise period of the synchronous signal is 1/2 of the period of the vertical synchronous signal. Pulses are eliminated alternately in the blanking period by a half killer circuit including a counter and a decoder and having a simple structure, thereby generating a horizontal synchronous signal appropriate for driving the TV cameras. The counter composed of Johnson counters connected in multiple stages reduces the amount of current flowing to the counter, thereby eliminating the deleterious influence on the TV cameras.
REFERENCES:
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patent: 3866022 (1975-02-01), Fletcher et al.
patent: 4169659 (1979-10-01), Marlowe
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patent: 4843469 (1989-06-01), Boyce
patent: 4866740 (1989-09-01), Iijima
patent: 4955041 (1990-09-01), Hoelzle
Patent Abstract of Japan, vol. 12, No. 351 (E-660)(3198), Sep. 20, 1988.
Heyman John S.
Sanyo Electric Co,. Ltd.
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