Conversion of a pcm signal into a upwm signal

Details Conversion of a pcm signal into a upwm signal Conversion of a pcm signal into a upwm signal

H - Electricity

03

M

H03M 5/08 (2006.01) H03M 1/82 (2006.01) H03F 3/217 (2006.01)

Patent

CA 2249460

To correct non-linearity and noise in the conversion of a pulse code modulated signal (PCM) into a uniform pulse width modulated signal (UPWM), a model is made of the known non-linearity in the conversion by dividing a plurality of non-linearity components in the model, where the polynomial components are separately weighted with filter coefficients. The model is used as a basis for the construction of a filter of the Hammerstein type whose non-linear parts consist of a division of the PCM signal into a plurality of powers, and whose linear parts are approximated by means of the model made. With the circuit of the invention it is now possible to construct a purely digital amplifier which has a great efficiency, low weight, etc.

Afin de corriger la non-linéarité et le bruit dans la conversion d'un signal à modulation par impulsions et codage (MIC) en un signal à modulation uniforme d'impulsions en largeur (MUIL), on produit un modèle de la non-linéarité connue dans la conversion en divisant une pluralité de composantes de non-linéarité dans le modèle, les composantes polynomiales étant séparément pondérées par des coefficients de filtrage. On utilise ce modèle comme base de fabrication d'un filtre du type Hammerstein dont les parties non-linéaires sont constituées par une division du signal MIC en une pluralité de puissances, et dont les parties linéaires sont obtenues par approximation au moyen du modèle produit. Le circuit selon l'invention permet de fabriquer un amplificateur entièrement numérique présentant, entre autres, une grande efficacité et un faible poids.

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