Digital sample and hold with rollover inhibit

Details Digital sample and hold with rollover inhibit Digital sample and hold with rollover inhibit

1980-12-05

1982-07-13

Hix, L. T.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

354 32, 354 60A, 307526, 250214P, 235 92V, 235 92FQ, 235 92CC, 235 92PL, 235 92CA, G03B 7091, H03K 500

Patent

active

043391842

ABSTRACT:
An electronic circuit for sampling a digital pulse train signal and providing a replication in place thereof during a selected holding period includes a binary counter and register for counting and storing a clock pulse of substantially higher frequency than the sampled digital pulse train together with control gates for inhibiting the counter from rolling over in the event that the period of the sampled digital pulse train becomes so long that the maximum binary count capacity of the counter is reached. The sampled digital pulse train signal is preferably provided by the scene light detecting and integrating circuit of a photographic camera apparatus and the holding period during which the digital pulse train signal is substituted by the replicated signal corresponds to the flash fire duration of a strobe.

REFERENCES:
patent: 3727526 (1973-04-01), Hinds
patent: 3818204 (1974-06-01), Hadida
patent: 4192587 (1980-03-01), LaRocque

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