Preh Elektrofeinmechanische Werke Jakob Preh Nachf Gmbh & Co.

Preh, Electrofeinmechanische Werke, Jakob Preh Nachf Gmbh & Co.

Bernd Veith

Alfred Vogt

Anton Ruttiger

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.

Remote control transmitter

Apparatus for receiving remote control signals which comprise an alternat sequence of two chronologically successive pulses, the first pulse having a first predetermined frequency and the second pulse having a second frequency manually selected from a predetermined number of frequencies, each of the predetermined number of frequencies representing a command to be carried out. The receiver comprises a signal detector, a signal amplifier and a circuit for decoding the remote control signal into a group signal dependent on the first frequency and a command signal dependent on the second frequency. A controllable gate is provided for gating the command signal from the decoding circuit to a command signal register having a command signal input for each of the commands, and an input for blocking each command signal output. Means coupled to the command signal outputs implement the commands. A circuit responsive to the group signal controls the gate, while a circuit responsive to receipt of a command signal in the register causes the remaining command signal inputs to be locked.

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Bad Neustadt, Germany

Bernd Veith