Rms converter using digital filtering

G - Physics – 01 – D

Patent

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G01D 1/02 (2006.01) G01R 19/02 (2006.01) G06F 17/10 (2006.01)

Patent

CA 2214241

In accordance with the present invention, an rms (root mean square) converter using digital samples is provided. The rms converter is implemented using a squaring circuit followed by an rms digital filter and a square root circuit. Each digital sample from the ADC is squared and then presented to an rms digital filter which produces filtered digital samples. A square root circuit then calculates the rms values from the filtered digital samples. The rms digital filter has a transfer function that is essentially a low pass filter that extracts the rms value from the stream of digital samples in a continuous manner without regard to the period or waveshape of the signal.

Convertisseur rms (moyenne quadratique) utilisant des échantillons numériques. Ce convertisseur est réalisé au moyen d'un circuit de transformation d'un signal en onde carrée, suivi d'un filtre numérique rms et d'un circuit d'extraction de racine carrée. Chaque échantillon numérique provenant du convertisseur analogique-numérique (ADC) est mis au carré puis présenté à un filtre numérique rms qui produit des échantillons numériques filtrés. Un circuit d'extraction de racine carrée calcule ensuite les valeurs rms à partir des échantillons numériques filtrés. Le filtre numérique rms a une fonction de transfert qui consiste essentiellement en l'extraction par filtre passe-bas de la valeur rms du train d'échantillons numériques de manière continue sans égard à la période ou à la forme d'onde du signal.

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