Digital frequency determining apparatus using matched filters

H - Electricity – 04 – L

Patent

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H04L 27/14 (2006.01)

Patent

CA 2571082

Methods and apparatus for determining a dominant frequency contained in a multi-frequency analog signal. An apparatus includes a first matched filter pair and a second a second matched filter pair. Both the first matched filter pair and the second matched filter pair are configured to receive in -phase (I- phase) and quadrature-phase (Q-phase) digital samples of a digitized multi- frequency analog signal. The summed magnitudes of outputs of the first and second matched filter pairs provide an indication of a dominant frequency represented in the digital samples. The first matched filter pair may include first and second matched filters, where the first matched filter includes a multiplier operable to multiply, on a sample-by-sample basis, a sample by a coefficient. A sample comprises an n-bit digital representation of either the I-phase amplitude or the Q-phase amplitude at a given instant. The coefficients are the terms required to complete the matching functions (e.g. 1- bit Walsh coefficients).

Procédés et dispositif de détermination d'une fréquence dominante contenue dans un signal analogique multi-fréquence. Le dispositif contient une première et une seconde paire de filtres appariés. Et la première et la seconde paire de filtres appariés sont conçus pour recevoir des échantillons numériques en phase (I-phase) et en phase quadrivalente (Q-phase) d'un signal analogique à multi-fréquence numérisée. Les importances additionnées des première et seconde paire de filtres appariés renseignent sur la fréquence dominante représentée dans les échantillon numériques. La première paire de filtres appariés peut comprend un premier et un second filtre apparié, le premier filtre apparié comprenant un multiplicateur servant é multiplier, échantillon par échantillon, un échantillon par un coefficient. Un échantillon comprend une représentation numérique de n bitssoit d'amplitude de phase I, soit d'amplitude de phase Q à un instant donné. Les coefficients sont les termes requis pour achever les fonctions de mise en correspondance (tels que coefficients Walsh 1 bit).

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