Means for distinguishing motion from noise in an intrusion alarm

Details Means for distinguishing motion from noise in an intrusion alarm Means for distinguishing motion from noise in an intrusion alarm

1976-09-20

1978-06-27

Caldwell, Sr., John W.

Communications: electrical

Systems

Call station

340 3D, 340258B, 343 5PD, G08B 1316

Patent

active

040978532

ABSTRACT:
Composite noise and information signals are amplified and filtered to segregate high and low frequency bands that correspond with noise from an intermediate frequency band which corresponds with the information signal. The absolute values of the two noise band signals are summed, weighted, and compared with the information band signal in an operational amplifier whose output tends toward a signal of one polarity with respect to a reference voltage due to noise and tends toward the opposite polarity due to the information band frequency. The signal is integrated and used to control an alarm circuit and environmental noise indicating devices. Means are provided to reduce sensitivity of one of the devices in the presence of high noise and to restore sensitivity if a valid information signal occurs. The other device is used to warn of persistent environmental noise that might be eliminated. The input amplifier of the system is provided with a feedback circuit that brings about compressor action to null the effect of high transient noises.

REFERENCES:
patent: 2794974 (1957-06-01), Bagno et al.
patent: 3582870 (1971-06-01), Peterson et al.
patent: 3614724 (1971-10-01), Brown et al.
patent: 3754222 (1973-08-01), Eisenberg
patent: 3801977 (1974-04-01), Cotter
patent: 3885234 (1975-05-01), Fujimoto
patent: 3976988 (1976-08-01), Fujimoto

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