H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 10/155 (2006.01)
Patent
CA 2644078
According to the invention, a very narrow-band transfer signal (LS) is generated by serially connecting a frequency modulator (2) and an amplitude modulator (4). The frequency modulator (2) is operated at a modulation index which at least largely suppresses the carrier signal (TS) while the amplitude modulator (4) suppresses the broadband portion of the spectrum by fading out the transfer signal (LS) during frequency-shift keying.
Selon l'invention, un signal de transmission à bande étroite (LS) est produit par une commutation en série d'un modulateur de fréquence (2) et d'un modulateur d'amplitude (4). Le modulateur de fréquence (2) fonctionne sur un indice de modulation qui supprime largement le signal de porteuse (TS) tandis que le modulateur d'amplitude (4) supprime la partie de diffusion du spectre grâce à la suppression du signal de transfert (LS) lors de la manipulation de fréquence.
Nokia Siemens Networks Gmbh & Co. Kg
Sim & Mcburney
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