Method and device for compensating undesired variations in...

Details Method and device for compensating undesired variations in... Method and device for compensating undesired variations in...

2005-03-29

2005-03-29

Lee, Michael G. (Department: 2876)

Registers

Coded record sensors

Particular sensor structure

C235S462230, C235S462250, C235S462260, C235S462270, C235S462280, C235S462290, C340S870180, C340S870190, C340S870210, C340S514000, C340S511000, C340S455000

Reexamination Certificate

active

06871785

ABSTRACT:
The method for compensating undesired variations in an electrical signal generated by a sensor of an optical code reader comprises the steps of generating an envelope signal starting from the electrical signal generated by the sensor and normalizing the electrical signal with respect to the envelope signal. Preferably, the envelope signal is filtered with a low-pass filter before being normalized so as to eliminate steps and edges which may cause distortions during normalization, and the normalized signal is amplified in a controlled way so as to supply an output signal ranging between two values having preset amplitudes. Normalization is carried out by dividing, point by point, the electrical signal by the envelope signal, in the case of continuous analog processing; alternatively, in presence of discrete-time signals, normalization is carried out by subtracting the envelope signal from the electrical signal.

REFERENCES:
patent: 3794919 (1974-02-01), Villeret et al.
patent: 3815124 (1974-06-01), Brewer
patent: 3832577 (1974-08-01), Harr
patent: 3986000 (1976-10-01), McJohnson
patent: 4356389 (1982-10-01), Quirey et al.
patent: 5028771 (1991-07-01), Yang
patent: 5272323 (1993-12-01), Martino
patent: 5298728 (1994-03-01), Elliott et al.
patent: 5432862 (1995-07-01), Hirsch
patent: 5506411 (1996-04-01), Tasaki
patent: 5714478 (1998-02-01), Spiegel
patent: 6031481 (2000-02-01), Craven
patent: 6036091 (2000-03-01), Spitz

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