Digital demodulator

H - Electricity – 04 – N

Patent

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Details

H04N 5/455 (2006.01) H03D 3/00 (2006.01) H03D 7/16 (2006.01) H03J 7/04 (2006.01) H04B 1/68 (2006.01) H04L 27/02 (2006.01) H04N 7/015 (2006.01) H03J 7/06 (2006.01)

Patent

CA 2235064

A digital demodulator includes: a local oscillator for generating a predetermined frequency signal; a mixer for mixing an intermediate frequency (IF) signal with a local oscillation frequency signal output by the local oscillator; an A/D converter for converting a signal output by the mixer into a digital signal; an I and Q signal generator for producing I and Q signals from an output of the A/D converter; and a compensation unit for compensating the signals I and Q for phase errors.

L'invention est un démodulateur numérique comprenant les éléments suivants : un oscillateur local servant à produire un signal ayant une fréquence prédéterminée; un mélangeur servant à mélanger un signal à fréquence intermédiaire (FI) avec un signal produit par l'oscillateur local; un convertisseur analogique-numérique servant à convertir le signal de sortie du mélangeur en un signal numérique; un générateur de signaux I et Q servant à produire des signaux I et Q à partir du signal de sortie du convertisseur analogique-numérique; et une unité de correction servant à corriger les erreurs de phase dans les signaux I et Q.

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