Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1974-12-26
1976-02-10
Stolwein, Walter
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250214R, 325452, 235 6111E, G06K 710, H04B 106
Patent
active
039379728
ABSTRACT:
A frequency synthesizer for scanning a number of predetermined frequencies using radiated electromagnetic energy detected at an array of electromagnetic energy transducers for providing a frequency determinative code. The frequency code is obtained by insertion of a programmed data mask between a source of electromagnetic energy and the array of electromagnetic energy transducers. The frequency code is connected to the input of a programmable divider which also receives the output from a voltage controlled oscillator. The programmable divider provides an output frequency which is a quotient of the voltage controlled oscillator output frequency. The quotient output frequency is compared with a reference frequency for producing a control voltage for the voltage controlled oscillator. The voltage controlled oscillator is thereby driven to produce an output frequency determined by the coded input to the programmable divider. A series of adjacent arrays of electromagnetic energy transducers is disposed to be serially exposed to a plurality of serially excited electromagnetic energy sources. Electromagnetic energy is sensed at predetermined ones in each array of electromagnetic energy transducers in accordance with the frequency determinative code. The sources of electromagnetic energy are serially energized by serial output signals from a counter connected thereto and means are provided for bypassing a coded channel when a source of electromagnetic energy is inoperative.
REFERENCES:
patent: 3531724 (1970-09-01), Fathaver
patent: 3686573 (1972-08-01), McVoy
patent: 3758751 (1973-09-01), Buecker
patent: 3829790 (1974-08-01), Macrander
patent: 3845393 (1974-10-01), Basset
Linear Systems Incorporated
Stolwein Walter
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