Communications: electrical – Systems – Call station
Patent
1975-03-25
1977-03-15
Swann, III, Glen R.
Communications: electrical
Systems
Call station
343 5PD, G08B 1318
Patent
active
040127303
ABSTRACT:
A Doppler detector device includes means for transmitting signals into a field to be protected, means for generating a unit step signal from the Doppler shift signal, means for integrating the unit step signal, means for activating an alarm when the output of the integrating means reaches a predetermined threshold level, and a false alarm inhibitor including means for sampling the integrator output and for resetting the integrator if the output does not reach the predetermined threshold level within a predetermined time. The false alarm inhibitor preferably comprises a level detector connected to the integrator output, a timer connected to and activated by detection of a predetermined signal level by the detector, and a reset current source connected to the integrator input and activated by the timer output, the predetermined signal level of the level detector being substantially lower than the predetermined threshold level.
REFERENCES:
patent: 3579220 (1971-05-01), Stevenson, Jr.
patent: 3706961 (1972-12-01), Sugiura
patent: 3727216 (1973-04-01), Antonio
patent: 3728721 (1973-04-01), Lee et al.
patent: 3760400 (1973-09-01), Galvin et al.
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