Power supply for microphone

H - Electricity – 04 – R

Patent

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Details

H04R 3/00 (2006.01)

Patent

CA 2273858

The invention concerns a circuit for the amplification of signals from a microphone, comprising a power source and a current generator which supplies a microphone, such as an electret microphone, with electrical energy in the form of pulses. The circuit clocks the power supply to the microphone with an active pulse time t1, and the sampling circuit reads the microphone signal in a window with the duration t2 calculated from the rear flank of the active part of the supply pulse, whereby t1 is shorter than the time period T corresponding to the sampling frequency 1/T, and whereby t1 is of a length which is sufficient to enable the microphone current to reach a usable value, and whereby t2 can be shorter than t1.

L'invention concerne un circuit d'amplification de signaux depuis un micro, ledit circuit étant constitué par une source de puissance et par un générateur de courant alimentant un micro, tel qu'un micro à électret, en énergie électrique sous forme d'impulsions. Ce circuit applique un signal d'horloge à l'alimentation du micro consistant en une impulsion active de durée t1 et le circuit d'échantillonnage lit le signal de micro dans une fenêtre, la durée t2 étant calculée depuis le flanc arrière de la partie active de l'impulsion d'alimentation, t1 étant, de ce fait, plus courte que la période T correspondant à la fréquence d'échantillonnage 1/T et t1 présentant une longueur suffisante pour permettre au courant du micro d'atteindre une valeur utile, t2 pouvant être, par conséquent, plus courte que t1.

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