Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1992-06-15
1993-11-23
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
307520, G08B 1318
Patent
active
052648290
ABSTRACT:
Signals received by an electronic article surveillance system are processed digitally to ascertain the variation in magnitude of successive signals and to prevent the actuation of an alarm when the variation exceeds a predetermined amount; and signals whose frequency components have been phase shifted from a filtering operation are restored by passing them into a signal delay circuit, tapping the delay circuit at several points therealong into associated signal channels selectively amplifying or attenuating the signal in each channel and combining the signals in each channel.
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patent: 4623877 (1986-11-01), Buckens
patent: 5023598 (1991-06-01), Zemlok et al.
patent: 5103209 (1992-04-01), Lizzi et al.
"Digital Filters", pp. 67-69 and 135-137.
"Automatic Equalization for Digital Communication", R. W. Lucky, The Bell System Tech. J., vol. XLIV, No. 4, Apr. 1965, pp. 547-588.
"An Automatic Equalizer for General Purpose Communication Channels", Lucky, et al., The Bell System Tech. J., vol. VLIV, No. 9, Nov. 1967 pp. 2179-2208.
Drawing, "Retrofit board for MM200", KNOGO Corporation, Hauppauge, N.Y., Jun. 20, 1990.
Lundquist David T.
Paul Christopher R.
Knogo Corporation
Swann III Glen R.
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