Device for reduction of the false alarm ratio and monitor receiv

Details Device for reduction of the false alarm ratio and monitor receiv Device for reduction of the false alarm ratio and monitor receiv

1982-09-28

1984-10-23

Bookbinder, Marc E.

Telecommunications

Receiver or analog modulated signal frequency converter

Squelch

455225, 455226, 455229, H04B 110, H04B 1700

Patent

active

044792522

ABSTRACT:
A monitor receiver incorporating a device for reducing the false alarm ratio comprises a frequency changer, a wobbulated oscillator, two band pass filters of which the central frequencies are constant and staggered, two logarithmic amplifiers and two energy detectors, which makes it possible to measure the energy on two staggered frequencies. The logic alarm signal supplied by the comparator is transmitted via a gate inhibited by means for detecting pulsed noises having an energy level greater than a value S', and validated by means of detecting signals of higher energy than a value S". The threshold values S' and S" are calculated by calculator means as a function of the mean value of the energy of the medium and long term persistent noise on frequencies close to the frequency monitored.

REFERENCES:
patent: 3462691 (1969-08-01), McDonald
patent: 3745465 (1973-07-01), Stover
patent: 3873926 (1975-03-01), Wright
patent: 3889192 (1975-06-01), Schiebelhuth et al.
patent: 3894285 (1975-07-01), Schaeperkotter
patent: 3995220 (1976-11-01), Hansen
patent: 4020421 (1977-04-01), Elder et al.
patent: 4034340 (1977-07-01), Sant'Agostino
patent: 4114105 (1978-09-01), Duncan
patent: 4143325 (1979-03-01), Kahn
patent: 4371981 (1983-02-01), King et al.
patent: 4388731 (1983-06-01), King
R. T. Hart, "Blank Noise Effectively with FM", Electronic Design, vol. 26, No. 18, (Sep. 1, 1978).

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