Wireless transceiver with subtractive filter compensating...

Details Wireless transceiver with subtractive filter compensating... Wireless transceiver with subtractive filter compensating...

H - Electricity

04

B

H04B 1/40 (2006.01) H04B 3/20 (2006.01) H04B 7/00 (2006.01)

Patent

CA 2402428

A wireless transceiver featuring a compensating filter circuit (17) with a frequency and optionally an amplitude response which has the same function as the composite of filter effects from the transmit side (15) as well as from the intermediate frequency (IF) stage of the receive side (13). The compensating filtering approximately duplicates the effects of the phase lock loop on the transmit side and the effects of IF filtering on the receive side, as well as amplitude distortion in the detector, which would delay or distort the audio. Then, the compensated audio is added or subtracted, depending on phase considerations, from the receive signal so that the receive signal is free of filter artifacts.

L'invention concerne un émetteur-récepteur sans fil équipé d'un circuit filtrant (17) de compensation avec une fréquence et, éventuellement, une réponse d'amplitude possédant la même fonction que le composite d'effets filtrants de l'émetteur (15) et de l'étage à fréquence intermédiaire (FI) du récepteur (13). Le filtrage de compensation duplique approximativement les effets de la boucle à verrouillage de phase du côté de l'émetteur et les effets du filtrage à fréquence intermédiaire du côté du récepteur, ainsi que la distortion d'amplitude dans le détecteur, ce qui retarde ou déforme l'audio. L'audio compensé est alors ajouté ou soustrait, en fonction de la phase, au signal de réception de façon que le signal de réception ne contienne pas d'éléments filtrants.

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