H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/32
H04B 7/24 (2006.01) G08C 19/12 (2006.01) G08G 1/09 (2006.01)
Patent
CA 1184609
Abstract of the Disclosure To decode control signals from a mixture of signals including audio signals, such as music, voice or speech in which the control signals are within the audio range; for example 2,350 Hz, on which a low-frequency signal, for example in the 100-200 Hz range is modulated, the control signal in the form of a control tone is filtered and demodulated by band pass filters (1,3), demodulators and rectifiers (2,4), and then applied to a timing circuit (5) which provides an output signal if and only if the demodu- lated control tone is continuously applied during the timing interval thereof. Suitable timing intervals are about 1 second. to provide an output signal which can switch a flipflop (7) on, for example to command radiation of a particular type of recognition signal by the trans- mitter (13), the setting of the flipflop (FF) (7) being fed back to the timing circuit to change the timing interval thereof to a lesser amount, for example 1/2 seconds to provide for a shorter signal to cause resetting of the FF (7). A second timing circuit (9) is provided to turn OFF the FF (7) in case it is overlooked to generate a 0.5 turn OFF signal and apply it to the first timing circuit (5).
415431
Heiss Dieter
Matzold Uwe
Blaupunkt-Werke G.m.b.h.
Macrae & Co.
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