Emergency broadcast alert detector

Details Emergency broadcast alert detector Emergency broadcast alert detector

1984-04-09

1986-12-30

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455 32, 455156, 455228, 340329, H03J 724, H04B 116

Patent

active

046335153

ABSTRACT:
An emergency broadcast alert detector having a radio receiver scanning among several predetermined frequencies. The audio output of the radio receiver is connected to a noise detector that allows scanning to continue as long as noise indicative of no signal being received is present on the audio output. When the radio receiver scans to a frequency on which a broadcast is present, the lack of noise on the audio output of the receiver causes scanning to discontinue. The audio output is also connected to a tone detector that generates an alarm for a predetermined period in the even that an alert tone of a predetermined frequency is present on the audio output of the radio receiver.

REFERENCES:
patent: 2882390 (1959-04-01), Kuhl, Jr. et al.
patent: 3124749 (1964-03-01), Craig
patent: 3701024 (1972-10-01), Knowles et al.
patent: 4009442 (1977-02-01), von Bromssen
patent: 4031467 (1977-06-01), Singleton, Jr. et al.
patent: 4218773 (1980-08-01), Imamura
patent: 4340973 (1982-07-01), Umetsu
patent: 4392248 (1983-07-01), Eckels et al.
patent: 4551855 (1985-11-01), Kurosaki et al.

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