Radio receiver and rebroadcaster

H - Electricity – 04 – B

Patent

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Details

H04B 1/38 (2006.01) C11D 11/00 (2006.01) H04B 14/08 (2006.01)

Patent

CA 2220312

A radio receiver and rebroadcaster comprises a first receiver for FM Radio signals, a frequency synthesizer and microprocessor controller, a subcarrier select filter and amplifier which filters out all signals from the composite baseband signal except for a desired subcarrier signal, a second receiver which converts the subcarrier signal to a recovered audio signal, a lowpass active filter which filters the recovered audio signal, a varactor modulator and rebroadcast transmitter which receives the filtered audio signal and varies the frequency of the signal emanating from the rebroadcast transmitter proportional to an audio wave form, and a band selector which is controlled by the microprocessor controller for controlling gain in the varactor modulator and for selecting a rebroadcasting frequency. The microprocessor controller provides tuning information to the frequency synthesizer, and the frequency synthesizer cooperates with the first receiver to provide a composite baseband signal. The subcarrier signal is selected by the microprocessor controller.

Récepteur radio et réémetteur comprenant un premier récepteur de signaux radio FM, un synthétiseur de fréquences et un contrôleur à microprocesseur, un filtre de sélection et amplificateur de sous-porteuse qui élimine tous les signaux du signal de bande de base composite à l'exception d'un signal de sous-porteuse désiré, un deuxième récepteur qui convertit le signal de sous-porteuse en un signal audio rétabli, un filtre actif passe-bas qui filtre le signal audio rétabli, un modulateur à varactor et un réémetteur qui reçoit le signal audio filtré et en varie la fréquence en fonction d'une forme d'onde audio, et un sélecteur de bande commandé par le contrôleur à microprocesseur afin de commander le gain du modulateur à varactor et de sélectionner une fréquence de réémission. Le contrôleur à microprocesseur transmet de l'information d'accord au synthétiseur de fréquence, qui s'associe au premier récepteur pour produire un signal de bande de base composite. Il sélectionne le signal de sous-porteuse.

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