G - Physics – 08 – G
Patent
G - Physics
08
G
363/30, 325/37
G08G 1/09 (2006.01) H04H 5/00 (2006.01) H04H 1/00 (2006.01)
Patent
CA 1116241
ABSTRACT A radio broadcasting system with code signaling where- in a multiplex signal frequency-modulated on a main carrier is transmitted at the transmitter side. The multiplex signal con- tains an audio frequency information and, in the case of stereo transmission, a stereo information signal modulated on a sup- pressed sub-carrier and a stereo pilot, which serves for de- modulating the stereo information signal, whose frequency is loc- ated between the frequency spectra of the audio frequency in- formation signal and of the modulated stereo information signal. The multiplex signal also contains a binary code signal which is modulated on a further sub-carrier located outside the frequency spectra of the audio frequency information signal and having an amplitude which causes the main carrier to deviate for not more than 1 KHz. The further sub-carrier is a harmonic of a sub- harmonic of the stereo pilot not coinciding with a harmonic of the stereo pilot and is derived at the transmitter side form the same frequency source as the stereo pilot. The code signal is binary phase modulated on this sub-carrier.
297759
Schmidt Johan M.
Van Der Heide Henri J.
Voorman Johannes O.
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
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