Title: Ultrasonic transmitter for the remote control of radio and television receivers

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.

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Inventors: Schroder, Wolfgang (Pforzheim, DT)

Application Number: 474455
Filing Date: 1974-05-29
Publication_date: 1976-02-10
Assignee: International Standard Electric Corporation (New York, NY)
Primary Class(es): 367/197
Other Classes:
US Patent Ref:

3009099	Nov, 1961	Muller	340/384.
3103664	Sep, 1963	Hooper	178/DIG.
3180199	Apr, 1965	Anderson	340/384.
3430230	Feb, 1969	Jones	340/384.
3440648	Apr, 1969	Camenzind	340/388.
3603985	Sep, 1971	Goralnick	340/384.
3678392	Jul, 1974	Houghton	340/171.
3747108	Jul, 1973	Ringer	340/171.
3846792	Nov, 1974	Haigh	340/384.

Other Refs:
Primary Examiner: Pitts, Harold I.
Assistant Examiner:
Attorney: O'Halloran; John T., Lombardi, Jr.; Menotti J., Van Der Sluys; Peter