Signal evaluating equipment

Details Signal evaluating equipment Signal evaluating equipment

H - Electricity

03

C

328/167, 354/56,

H03C 1/00 (2006.01) B07C 3/14 (2006.01) G06K 7/10 (2006.01) H02J 13/00 (2006.01) H03K 5/1532 (2006.01) H03K 5/24 (2006.01)

Patent

CA 1104218

A B S T R A C T Signal evaluating equipment particularly but not exclusively useful in reading bar codes on envelopes is disclosed. The equipment includes a first peak detector circuit to detect and register a first peak value of a first portion of the signal and a second peak detector circuit to detect and register a second peak value of a second portion of the signal. These two values are then compared in a comparator to establish whether they satisfy a predetermined relationship. The use of this system permits large amplitude variations between the signals being read and background noise to be accommodated.

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