Title: Remote control transmitter

Abstract: A remote control transmitter for transmitting remote control signals which omprise an alternating sequence of two chronologically successive pulses having a first and a second frequency, respectively. The transmitter comprises a plurality of manually-operable command keys for supplying a command signal upon operation, an encoding circuit for supplying the command signal in logic form, a pulse generator having outputs which are the logic inverse of one another, a transmitting circuit for transmitting a signal dependent upon the logic signal supplied at its inputs, and a matrix of coupling points. Each coupling point is connected by a resistance element to a respective encoding circuit output, by a diode of predetermined polarity to a pulse generator output, and to a respective transmitting circuit input. The polarity of the diodes is such that during a first portion of the pulse generator period a predetermined logic command signal is supplied to the transmitting circuit, while during a second portion of the period the manually-selected command signal is supplied thereto.

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Inventors: Vogt, Alfred (Salz, DE, US)
Veith, Bernd (Bad Neustadt, DE, US)
Ruttiger, Anton (Oberbach, DE, US)

Application Number: 934618
Filing Date: 1978-08-17
Publication_date: 1980-06-17
Assignee: Preh, Electrofeinmechanische Werke, Jakob Preh Nachf GmbH & Co. (Salz, DE)
Primary Class(es): 341/20 341/176, 367/137
Other Classes:
US Patent Ref:

3403381	Sep, 1968	Hamer	340/171.
3472965	Oct, 1969	Blossom	340/171.
3495219	Feb, 1970	Clapp et al.	340/171.
4010447	Mar, 1977	Podowski	340/171.

Other Refs: 21608432429066

Dec, 1971	DE
Jan, 1976	DE

Primary Examiner: Griffin, Robert L.
Assistant Examiner: Durigon, Peter
Attorney: Beall, Jr.; Thomas E.