Circuit for digitally processing exposure information

Details Circuit for digitally processing exposure information Circuit for digitally processing exposure information

1977-03-03

1980-01-15

Miller, Charles D.

Communications: electrical

Audible indication

Percussion-type sound producer

356223, 354 23D, H03K 1320

Patent

active

041841514

ABSTRACT:
A circuit system designed to realize fully digitalized automatic exposure controls is provided in which the read-in brightness information is logarithmically compressed directly into a digital quantity without the aid of any diode element that exhibits a logarithmic characteristic. This enables full utilization of the merits of digitalization while affording further advantages including increased stability against temperature and voltage variations.

REFERENCES:
patent: 3273142 (1966-09-01), Zukin
patent: 3631468 (1971-12-01), Spaid
patent: 3760407 (1973-09-01), Terry
patent: 3909137 (1975-09-01), Kisanuki
patent: 3995284 (1976-11-01), Kitaura et al.
patent: 4023159 (1977-05-01), Miyakawa
patent: 4037233 (1977-07-01), Shinoda et al.
Johannesen, "Electronics Letters", Sep. 1971, vol. 7, No. 12, pp. 592-593.

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