Digital processing device for an analog signal to be...

H - Electricity – 03 – M

Patent

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H03M 1/40 (2006.01) H03M 1/66 (2006.01)

Patent

CA 2230366

A device includes a converter implementing a three decision range conversion algorithm involving ternary digital values bi, with bi = 1, 0 or -1. The converter has a reference voltage source (Vr), and computing means (MC; MC-A) for establishing, during each iteration of a series of successive iterations of the algorithm, a voltage value derived from the sum of a value determined on the basis of the voltage calculated at the preceding iteration and a value which is the product of the ternary value obtained during the preceding iteration and said reference voltage. Said computing means include switched capacitors (Cr, C1, C2) connected as a unidirectional assembly and co- operating with a unique operational amplifier (11) providing the voltage value to each of said iterations. The device is particularly useful for hearing aids.

Ce dispositif comprend notamment un convertisseur mettant en oeuvre un algorithme de conversion à trois plages de décision impliquant des valeurs numériques ternaires b¿i?, avec b¿i? = 1, 0, ou -1. Ce convertisseur comprend une source de tension de référence (V¿r?), des moyens de calcul (MC; MC-A) pour, au cours de chacune des itérations d'une suite d'itérations successives de l'algorithme, établir une valeur de tension formée de la somme d'une valeur établie sur la base de la tension calculée à l'itération précédente et d'une valeur qui est le produit de la valeur ternaire obtenue au cours de l'itération précédente et de ladite tension de référence. Les moyens de calcul comprennent des capacités (Cr, C1, C2) commutées raccordées selon un montage unilatéral et coopérant avec un unique amplificateur opérationnel (11) délivrant la valeur de tension à chacune desdites itérations. Application notamment aux aides auditives.

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