Asynchronous to synchronous converter

Details Asynchronous to synchronous converter Asynchronous to synchronous converter

1976-02-05

1978-03-14

Kilgore, Robert M.

Registers

Coded record sensors

Particular sensor structure

235 92DP, G06K 714, G06F 738

Patent

active

040792404

ABSTRACT:
An asynchronous to synchronous converter is disclosed which produces clock pulses in synchronism with data bits of a non-return-to-zero (NRZ) code having a variable data rate. The converter is established adapted for use in optical reading of the Universal Products Code (UPC) code symbol which is of bar code format. The converter comprises a high level bit clock system for clocking the dark bar bits and a low level bit clock system for clocking the light bar bits. A high level measurement circuit times the single bit dark bar pulses and sets the timing for the low level bit clock system and a low level measurement circuit times the single bit low level pulses and sets the timing for the high level bit clock system. The converter receives asynchronous serial data and produces a clock pulse for each bit of the data pulse so that the serial data may be decoded.

REFERENCES:
patent: 3723710 (1973-03-01), Croose
patent: 3763353 (1973-10-01), Nassimbene
patent: 3860792 (1975-01-01), Myren
patent: 3864548 (1975-02-01), O'Neil
patent: 3891831 (1975-06-01), Coles
patent: 3916154 (1975-10-01), Hare

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