FREQUENCY SIGNAL ENCODING
The receiving part of the remote control system receives the particular command signal transmitted by the remote transmitter and the required operation is carried out. The receiver contains a crystal matched to that in the transmitter and also a number of tuned circuits which respond to the different frequencies transmitted. The ultrasonic signal is sensitive to external noise. To overcome this drawback, different methods of encoding the signal can be used. One of them is the frequency signal encoding.
In the system, Fig. 35.2 (a) the transmitter uses two separate oscillator. One of the oscillator generates a carrier wave and the other, a modulating signal. By a slight variation in the tuning circuit, the carrier oscillator ...
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