H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 15/06 (2006.01) H03D 7/16 (2006.01) H04B 1/10 (2006.01) H04B 1/30 (2006.01) H03B 23/00 (2006.01)
Patent
CA 2104215
A radio receiver, and associated method therefor, for generating a baseband signal having signal component portions of time-varying frequencies. The oscillating signal generated by at least one of the low oscillators of down-mixing circuitry (680, 744, 750) of the receiver is modulated by a low-frequency signal thereby to cause the resultant, baseband signal to be comprised of signal component portions of time-varying frequencies. Because the signal component portions of the baseband signal are of time-varying frequencies, attenuation of such signal component portions and resultant distortion of the received signal, as a result of undesired notches in the frequency response of a radio receiver is avoided.
Récepteur radio et méthode associée, permettant de produire un signal en bande de base à composantes fréquentielles variables dans le temps. Le signal oscillant produit par au moins un des oscillateurs locaux du circuit abaisseur-mélangeur (680, 744, 750) du récepteur est modulé par un signal à basse fréquence de sorte que le signal en bande de base résultant soit constitué de composantes fréquentielles variables dans le temps. Le fait que le signal en bande de base est composé de fréquences variables dans le temps permet d'éviter l'affaiblissement de ces composantes et la distorsion résultante du signal reçu en raison de chutes indésirées dans la réponse en fréquence d'un récepteur radio.
Johnson Robert M. Jr.
Moller Paul J.
Sanecki Theodore T.
Gowling Lafleur Henderson Llp
Motorola Inc.
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