Telecommunications – Transmitter and receiver at separate stations – Frequency or phase modulation
Patent
1985-01-14
1986-04-22
Bookbinder, Marc E.
Telecommunications
Transmitter and receiver at separate stations
Frequency or phase modulation
332 21, 332 22, 332 40, 332 41, 370 11, 381 4, 455 70, 455102, H04B 100
Patent
active
045847088
ABSTRACT:
FM transmission system in which, besides program content, an auxiliary carrier of, for example 57 kHz, is radiated, which auxiliary carrier is modulated by an announcement recognition (AR) signal and by a region or radio-station recognition (RR) signal, the AR and RR signals being low-frequency, AM modulations on the auxiliary carrier. To enhance recognition of an AR signal, e.g. between 142 and 170 Hz, is enhanced, in spite of reception difficulties, for example due to multi-path reception and the like, by decreasing the modulation of the 57 kHz subcarrier by the RR signal to 30% or less, while the AR signal is modulating the subcarrier, so that the AR modulation may extend to 60 and even 90% modulation. Multiple AR frequencies can be used, for example to characterize different announcements, e.g. in different languages, or of different characteristics, such as traffic, news, sports, or others, recognition of the AR signal in the receiver permitting switch-over from other reproduced programs, e.g. tape, to the demodulator from the receiver tuned to the station emitting the AR signal, to reproduce the announcement, or the like.
REFERENCES:
patent: 2008082 (1935-07-01), Mueller
patent: 2414431 (1947-01-01), Alford et al.
patent: 3922607 (1975-11-01), Wysong
patent: 4379947 (1983-04-01), Warner
"Verkehrsrundfunk"-P. Bragas, Aug. 1974, Rundfunktechnische Mitteilungen, vol. 18, No. 4, pp. 193-202.
"Codage en Modulation de Phase des E'Metterurs Regionaux a Modulation d'Amplitude: Application AU Radio-Guidage-J. Lepaisant et al., Oct. 1980, L'Onde Electrique, vol. 60, No. 10, pp. 33-38.
Bragas Peter
Eilers Norbert
Blaupunkt-Werke GmbH
Bookbinder Marc E.
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