Telecommunications – Receiver or analog modulated signal frequency converter – Frequency or phase modulation
Patent
1983-03-23
1985-02-12
Bookbinder, Marc E.
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency or phase modulation
34082572, 34082573, 455 45, 455228, H04B 126
Patent
active
044996039
ABSTRACT:
To monitor the operability of a radio receiver which has special recognition circuitry to recognize warning or emergency announcements, a modulation detector (11) is provided, sensing the change in degree of modulation of a region recognition (RR) signal, which changes its degree of modulation when an announcement recognition (AR) signal is radiated, the degree-of-modulation signal being stored in a memory (flip-flop 12), the output of which controls a transfer switch (6). The transfer switch transfers output from a muting stage (5) in the receiver, which is disabled upon detection of the AR frequency to a tone generator, for application to the amplifier of a warning tone if no change in the degree of modulation of the RR signal has been detected within a predetermined time period, as determined by a timing stage (15). A suitable timing interval is, for example, 24 hours. If such timing signals are received, the tone generator is not enabled, however.
REFERENCES:
patent: 3949401 (1976-04-01), Hegeler et al.
patent: 4435843 (1984-03-01), Eilers et al.
patent: 4450589 (1984-05-01), Eilers et al.
Blaupunkt Werke GmbH
Bookbinder Marc E.
LandOfFree
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