Ultrasonic transmitter for the remote control of radio and telev

Details Ultrasonic transmitter for the remote control of radio and telev Ultrasonic transmitter for the remote control of radio and telev

1974-05-29

1976-02-10

Pitts, Harold I.

Communications: electrical

Audible indication

Diaphragm

G08B 300

Patent

active

039381420

ABSTRACT:
A polarizing D.C. voltage is generated at the capacitance of the ultrasonic transducer and then short-circuited by a parallel-arranged electronic switch controlled by the command signal frequency to be radiated. A direct current stored in an inductance during this short-circuit phase is supplied via a decoupling diode to the electrodes of the ultrasonic transducer upon opening of the switch, and after having been transformed into a voltage. The polarizing D.C. voltage is thus re-generated periodically.

REFERENCES:
patent: 3009099 (1961-11-01), Muller
patent: 3103664 (1963-09-01), Hooper
patent: 3180199 (1965-04-01), Anderson
patent: 3430230 (1969-02-01), Jones
patent: 3440648 (1969-04-01), Camenzind
patent: 3603985 (1971-09-01), Goralnick
patent: 3678392 (1974-07-01), Houghton
patent: 3747108 (1973-07-01), Ringer
patent: 3846792 (1974-11-01), Haigh

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