Barcode scanner with linear automatic gain control (AGC),...

Details Barcode scanner with linear automatic gain control (AGC),... Barcode scanner with linear automatic gain control (AGC),...

2007-05-15

2007-05-15

Le, Thien M. (Department: 2876)

Registers

Coded record sensors

Particular sensor structure

C235S472010

Reexamination Certificate

active

10825944

ABSTRACT:
According to embodiments of the present invention, a barcode scanner platform is provided in which the gain of an analog signal representative of a barcode is controlled using a control loop. In embodiments, an MTF detector generates a value (e.g., DC) representative of a low frequency portion (wide or out of optical focus elements) of the analog signal and a second value (e.g., DC) representative of a high frequency portion (narrow elements or in optical focus elements) of the analog signal. The processor uses the first and the second values and a reference amplitude to determine a gain signal. The processor provides the gain signal to an AGC circuit that provides a linear response to the gain signal using matched JFETs. A noise filter can be enabled or disabled based on the first value, the second value, and/or the barcode scanner platform read rate.

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patent: 6502751 (2003-01-01), Tang
patent: 6811087 (2004-11-01), Nakamura et al.

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