Automatic gain control circuit having disturbance cancellation c

Details Automatic gain control circuit having disturbance cancellation c Automatic gain control circuit having disturbance cancellation c

1992-06-30

1994-09-27

Willis, Davis L.

Registers

Coded record sensors

Particular sensor structure

330129, 307264, H03G 332, G06K 710

Patent

active

053509080

ABSTRACT:
A system for filtering electrical signals and cancelling large amplitude disturbance events contaminating such signals which might otherwise interfere with these signals being further processed. The system includes a disturbance filter which is operative for identifying disturbance events and passing an inverted signal corresponding solely to these events to a summing junction for use in cancelling these events as they occur. In the preferred embodiment this system is adapted for use in a bar code reader.

REFERENCES:
patent: 3258711 (1963-03-01), Searl et al.
patent: 3900832 (1975-08-01), Hanchett
patent: 3930256 (1975-12-01), Amemiya
patent: 4224578 (1980-09-01), Bernitt
patent: 4433304 (1984-02-01), Engle
patent: 4667242 (1987-05-01), Hagino
patent: 5068520 (1991-11-01), Sato
patent: 5128629 (1992-07-01), Trinh
patent: 5191407 (1993-03-01), Kawano et al.

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