Electronic multiplexer for parallel, bi-directional scanning the

Details Electronic multiplexer for parallel, bi-directional scanning the Electronic multiplexer for parallel, bi-directional scanning the

1977-10-13

1978-10-24

Robinson, Thomas A.

Telegraphy

Systems

Printing

178 50, H03K 1704

Patent

active

041223110

ABSTRACT:
A system for generating a serial video signal from a plurality of parallel channels particularly useful in thermal imaging systems incorporating bi-directional scanning. Signals on parallel input lines are simultaneously sampled and held by individual sample and hold circuits in each channel. A first multiplex level having a plurality of slow multiplexers is arranged so that each slow multiplexer selects a subset of the total number of analog inputs to generate a serial output from each slow multiplexer. Each such single output is coupled to a high speed gate in a fast multiplexer to generate a serial output from a single output channel. The fast multiplexers operate at a rate determined by the output scan time divided by the number of parallel input channels. The slow multiplexers operate at a fraction of this speed where the fraction is equivalent to one over the number of slow multiplexers generating an input to the fast multiplexer.

REFERENCES:
patent: 3427475 (1969-02-01), Wilkinson et al.
patent: 3581017 (1971-05-01), Stevens et al.
patent: 4017687 (1977-04-01), Hartzler et al.

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