Exposure indicating device for a camera utilizing analog-digital

Details Exposure indicating device for a camera utilizing analog-digital Exposure indicating device for a camera utilizing analog-digital

1980-04-18

1982-06-15

Sloyan, Thomas J.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340347AD, 340347M, 354 23D, G03B 700, H03K 1302

Patent

active

043347452

ABSTRACT:
An indicator arrangement includes comparators for parallel comparison of an analog input voltage with digitalizing standard voltages to digitalize the input voltage and an indicator for indicating digitalized output. The arrangement is provided with a controller periodically switched between a first control state and a second control state. The controller in the first control state allows the comparators to perform comparison in a first voltage range of the analog input voltage while in the second control state it allows the comparators to perform comparison in a second voltage range of the analog input voltage.
There is provided an encoder for coding the digitalized output of the comparators with a first coding mode in the first control state of the controller and coding the digitalized output of the comparators with a second coding mode in the second control state. The encoder is adapted to drive the indicator with a first or second mode according to the state of the controller.

REFERENCES:
patent: 3316547 (1967-04-01), Ammann
patent: 3935569 (1976-01-01), Marcel et al.
patent: 3949170 (1976-04-01), Shionoya
patent: 3990799 (1976-11-01), Nanba et al.
Stephenson, Analog-Digital Conversion Handbook, 1964, Digital Equipment Corp., 1964, pp. 20-22.

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