Output stage for a hearing aid and method of driving output...

H - Electricity – 04 – R

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H04R 25/00 (2006.01) H03F 3/217 (2006.01)

Patent

CA 2554515

In an output stage for a hearing aid (62), a reduction in the power consumption for low level input signals is obtained through the use of a time- averaging output driver (42), whereby the output transducer is subject to three different conditions of operations, this being obtained through the generation of three-state control signals for control of a H-bridge. The three- state control signals are generated through the use of a time-averaging device whereby the two-level output of a single bit Sigma-Delta modulator (21) is transformed to a set of control signals that, at any given time, can assume one of three states. In a preferred embodiment the time-averaging device is a delay (40).

Selon cette invention, dans un étage de sortie pour aide auditive (62), il est possible de réduire la consommation d'énergie pour des signaux d'entrée de basse fréquence au moyen d'un excitateur de sortie de moyennage temporel (42), le transducteur de sortie étant soumis à trois conditions de fonctionnement différentes obtenues au moyen de la génération de signaux de commande à trois états servant à commander un pont en H. Les signaux de commande à trois états sont générés à l'aide d'un dispositif de moyennage temporel, la sortie à deux niveaux d'un modulateur Sigma-Delta à un seul bit (21) étant transformée en un ensemble de signaux de commande qui peut, à un moment donné quelconque, adopter un des trois états. Dans un mode de réalisation préféré de cette invention, le dispositif de moyennage temporel est un réverbéromètre (40).

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