H - Electricity – 03 – D
Patent
H - Electricity
03
D
H03D 3/00 (2006.01) H04B 1/06 (2006.01) H03C 3/09 (2006.01)
Patent
CA 2097042
Signal processing apparatus for processing angularly modulated signals includes a preselector, reducing means for reducing the deviations of the modulation, and processing means, including the reducing means, for producing the demodulated output of the modulated signal. The improvement includes a phase locking oscillator being used as a part of the processing means, the frequency of which is D.C. modulated by a signal derived from the processing means, whereby the phase locking oscillator is disposed within a phase-locked loop that is formed by the processing means. The signal processing apparatus optionally includes means for modulating the forward path of the phase locking oscillator, means for D.C. modulating the feedback path of the phase locking oscillator as an exact mathematical function of the signal derived from the processing means, and means for channelizing the output frequency of the phase locking oscillator.
L'invention est un appareil de traitement de signaux à modulation angulaire qui comprend un présélecteur, un dispositif de réduction des déviations de modulation et un dispositif de traitement incluant ce dispositif de réduction qui sert à démoduler le signal modulé. L'amélioration apportée par l'invention est constituée par l'utilisation d'un oscillateur à asservissement de phase qui fait partie de ce dispositif de traitement et dont la fréquence est modulée par un signal obtenu du dispositif de traitement, l'oscillateur à asservissement de phase étant monté dans une boucle à phase asservie formée par le dispositif de traitement. L'appareil de traitement de signaux de l'invention comprend facultativement un dispositif de modulation du trajet direct de l'oscillateur à asservissement de phase, un dispositif de modulation du trajet de réaction de cet oscillateur sous la forme d'une fonction mathématique exacte du signal obtenu du dispositif de traitement, et un dispositif de découpage en canaux de la fréquence du signal de sortie de l'oscillateur à asservissement de phase.
Emhiser Research Limited
Smart & Biggar
LandOfFree
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