Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1996-02-26
1997-11-04
Mullen, Thomas
Communications: electrical
Condition responsive indicating system
Specific condition
340552, 340567, 367 94, G08B 1318
Patent
active
056844581
ABSTRACT:
An apparatus and method for varying the sampling frequency of a Doppler effect device, based on environmental conditions, is described comprising: (i) a transmitter for transmitting energy into a protected area; (ii) a receiver for receiving energy reflected from the protected area and for transforming the received energy into a motion detection signal which is proportional to any Doppler energy received by the receiver; (iii) a processor responsive to the motion detection and operative to automatically modify the sampling frequency when the motion detection signal exceeds a predetermined threshold value and the apparatus has not been operated at each of a plurality of sampling frequencies; and (iv) an alarm coupled to the processor activated when the motion detection signal exceeds the predetermined threshold value and the apparatus has been operated at each of the plurality of sampling frequencies. The device is useful in minimizing unstable Doppler effect channels in both single and dual technology devices.
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Mugno John R.
Mullen Thomas
Napco Security Systems, Inc.
Rushing Mark S.
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