FM Receiver for general programs and special announcements

Details FM Receiver for general programs and special announcements FM Receiver for general programs and special announcements

1981-11-09

1984-03-06

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency or phase modulation

455 45, 455 32, 455 36, 455228, 34082572, 34082573, H04B 116

Patent

active

044358431

ABSTRACT:
To improve reliability of recognition of an announcement recognition (AR) signal radiated by a transmitter upon broadcasting an announcement (e.g. traffic information, news, etc.), in the form of AM modulation of a 57 kHz auxiliary subcarrier, in which the subcarrier may also be modulated by other control signals, the subcarrier is filtered in the receiver, demodulated, and the degree of all modulations, regardless of frequency, on the subcarrier is sensed, and if the modulation changes significantly, for example rises from 60% modulation to 90% modulation (50% change), a switch (4) is activated which inhibits transmission of audio programs from an external source, such as a tape recorder (5), tuner tuned to another station, or the like, and reproduces the announcement being broadcast; termination of the AR signal, forming the AR modulation on the subcarrier, causes the switch to revert for reproduction of previously controlled audio information.

REFERENCES:
patent: 3922607 (1975-11-01), Wysong
patent: 3949401 (1976-04-01), Hegeler et al.
patent: 4334320 (1982-06-01), Liman
"Verkehrsrundfunk" by Von Peter Bragas, Rundfunktechnische Mitteilungen, vol. 18, No. 4, 8/1974.
L'Onde Electrique, Band 60, No. 10, Oct. 1980, Sgiten 33-38, Paris (Fr), by J. Lepaisant et al.

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