Optical code reader having a controllable amplifier and methods

Details Optical code reader having a controllable amplifier and methods Optical code reader having a controllable amplifier and methods

1998-06-17

2000-09-19

Le, Thien M.

Registers

Coded record sensors

Particular sensor structure

23546225, 23546245, 23547201, G06K 714

Patent

active

061199389

ABSTRACT:
An amplifier has an input responsive to an optical detector. A comparator is responsive to an output of the amplifier. A data communication circuit is responsive to the comparator. An optical emitter is responsive to the data communication circuit. A multi-bit analog-to-digital converter is responsive to the output of the amplifier. A processor reads a sample from the multi-bit analog-to-digital converter while the optical emitter is cooperating with the data communication circuit to transmit a message. The processor applies a signal to a control input of the amplifier in response to determining that the sample is beyond a threshold.

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Zuckerman, "It's a Brand New E-Mail, Companies Want to Turn Computers Into Postage Meters", The New York Times, Monday, Apr. 28, 1997.

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