Process and device for the radio transmission of coded data...

Details Process and device for the radio transmission of coded data... Process and device for the radio transmission of coded data...

H - Electricity

04

B

325/58

H04B 1/04 (2006.01) H04H 1/00 (2006.01)

Patent

CA 1253920

ABSTRACT OF THE DISCLOSURE The device comprises an input unit (40) for generating coded data to be transmitted, an FSK coder- modulator (30) for modulating, by frequency shift, the coded data to be transmitted, in a frequency range located between about 15 and 18 kHz, a mixer circuit (32) for superimposing, with an attenuation of 20 to 40 dB, the signals modulated by frequency shift on a low-frequency signal of a traditional program to be applied to a frequency modulation radio transmitter (20), a decoder comprising filter circuits and an FSK de- modulator for separating the coded data from the signals delivered by a standard frequency modulation receiver, and a display or recording unit for displaying or recording the demodulated, filtered, transmitted coded data.

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