Registers – Coded record sensors – Particular sensor structure
Patent
1986-09-30
1989-01-17
Salce, Patrick R.
Registers
Coded record sensors
Particular sensor structure
235466, G06K 710
Patent
active
047989432
ABSTRACT:
A system for control of a bar code scanner threshold with deliberate decay includes monitoring a selected scan signal characteristic of characteristics and electronically determining whether sets of signal characteristics represent a bar code or extraneous noise, and, if noise is indicated, raising the black/white threshold until noise is no longer detected. The monitored characteristics can include frequency of perceived black/white transition. In a preferred embodiment, the raw scan signal is processed through two circuits, a first circuit wherein a threshold is generated based on the signal and a selected threshold criterion, and a second circuit wherein the threshold generated in the first circuit is applied to the signal to produce a bar signal output, which output is then monitored by a noise recognition device. If noise is perceived by the noise recognition device, a threshold offset signal is generated. The threshold generated in the first circuit is raised by adding to it the threshold offset signal. Then the raised threshold is fed through a threshold detection device in a third circuit which also receives the scan signal, to produce an output bar signal which substantially excludes noise readings. In this way, although the threshold will decay to accommodate changing conditions, it will be raised as necessary if it goes so low as to start reading noise.
REFERENCES:
patent: 3991299 (1976-11-01), Chadima, Jr. et al.
patent: 3993894 (1976-11-01), Walker
patent: 4000347 (1976-12-01), Hebert et al.
patent: 4219152 (1980-08-01), Couch et al.
patent: 4323772 (1982-04-01), Serge
patent: 4354101 (1982-10-01), Hester et al.
patent: 4528443 (1985-07-01), Smith
patent: 4528444 (1985-07-01), Hara et al.
patent: 4740675 (1988-04-01), Brosnan et al.
patent: 4749879 (1988-06-01), Peterson et al.
Davis Paul
Feix Donald C.
Freiburger T. M.
Hoff Marc S.
Salce Patrick R.
LandOfFree
Method and system for control of a bar code scanner threshold does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and system for control of a bar code scanner threshold, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and system for control of a bar code scanner threshold will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2414245