H - Electricity – 04 – N
Patent
H - Electricity
04
N
H04N 5/14 (2006.01) H03J 1/00 (2006.01) H04N 5/50 (2006.01)
Patent
CA 2210805
A tuner includes a conversion (or heterodyning) stage, including a local oscillator and a mixer, for converting an RF signal corresponding to a selected channel to an IF signal. The local oscillator has only one tunable oscillating portion for generating a signal, and a frequency converter, such as a controllable frequency divider, for converting the frequency of the signals generated by said oscillating portion, so that the receiver is able to tune through the UHF and VHF bands. The operation of the frequency converter is responsive to a digital controller, such as a microprocessor.
Un sélecteur de canaux comprend un étage de conversion (détection cohérente) avec un oscillateur local et un mélangeur, pour convertir le signal HF correspondant à un canal choisi, en un signal FI. L'oscillateur local présente uniquement une portion oscillante syntonisable pour générer un signal et un convertisseur de fréquence, tel qu'un diviseur de fréquence ajustable, pour convertir la fréquence des signaux générés par ladite portion oscillante, de sorte que le récepteur peut être syntonisé dans les bandes UHF et THF. Le convertisseur de fréquence est commandé au moyen d'une commande numérique, par exemple un microprocesseur.
Craig Wilson And Company
Rca Thomson Licensing Corporation
LandOfFree
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