Method and apparatus for converting radiant energy levels to dig

Details Method and apparatus for converting radiant energy levels to dig Method and apparatus for converting radiant energy levels to dig

1983-03-14

1985-09-24

Sloyan, T. J.

Communications: electrical

Audible indication

Percussion-type sound producer

340347M, 356229, 356230, 377 42, H03K 1308

Patent

active

045435588

ABSTRACT:
A method and apparatus for converting radiant energy levels to digital data wherein an image sensor is provided having at least one row of sensor elements each including a light sensitive capacitor and an access switch and which changes state produces a corresponding binary output signal when a predetermined charge threshold is exceeded by the capacitor whose charge is a function of intensity and period of an illumination. The row of elements is first calibrated by illuminating same with a reference light source and sensing at a first frequency (F) such that approximately one half of the elements change state and counting the digital output signals corresponding to the changes of state to obtain a first number (B). Thereafter, the row is illuminated with an unknown light source which has a lower radiant energy level than that of the reference light source and senses at a frequency F/2. The digital output signals corresponding to the changes of state are counted to obtain a second number (A). The numbers A and B are compared to produce a digital "1" signal when A>B and a digital "0" when A<B corresponding to digital data bit N.sub. 1. The sensing and comparing are repeated for each successive bit N.sub.2, N.sub.3 . . . N.sub.k of a K bits of digital data at successive sensing frequencies in accordance with ##EQU1##

REFERENCES:
patent: 3100298 (1963-08-01), Fluhr
The Engineering Staff of Analog Devices, Inc., Analog-Digital Conversion Handbook, 6/1972, pp. II-46 to II-48; II-80 to II-83.

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