ULTRASONIC TRANSDUCERS
The operation of an acoustic type remote control system depends upon the use of transducers. One transducer in the transmitter, i.e. in the hand-held remote control unit, converts a mechanical vibration into high-frequency sounds. Another transducer in the receiver converts the high-frequency sounds into electrical signals which can be used for operating a control in the receiver.
Two basic transmitter types are used. The first is the mechanical or “bonger type” which employs a cylindrical aluminium rod which vibrates in its longitudinal mode when struck. If such a rod is struck on one end by a hammer moving along its axis, it emits a sustained note which has a definite frequency. For example, an aluminium rod 2½” long ...
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