Remote control transmitter

Details Remote control transmitter Remote control transmitter

H - Electricity

04

L

340/175

H04L 23/00 (2006.01) G08C 19/14 (2006.01) H03J 9/04 (2006.01)

Patent

CA 1101964

Remote Control Transmitter Abstract A remote control transmitter for transmitting remote con- trol signals which comprise 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 gener- ator 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 connec- ted by a resistance element to a respective encoding cir- cuit 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 cir- cuit, while during a second portion of the period the manu- ally-selected command signal is supplied thereto. - 1 -

309582

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