Radio receiver with reception-readiness monitoring feature,...

Details Radio receiver with reception-readiness monitoring feature,... Radio receiver with reception-readiness monitoring feature,...

H - Electricity

04

B

325/87

H04B 1/16 (2006.01) G08G 1/09 (2006.01)

Patent

CA 1190601

ABSTRACT OF THE DISCLOSURE To monitor the operability of a radio receiver which has special recog- nition circuitry to recognize warning ro 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 dis- abled 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.

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