Method and apparatus for detecting an input signal level

H - Electricity – 03 – G

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H03G 7/00 (2006.01) H03G 7/06 (2006.01)

Patent

CA 2152497

A level detector detects an input signal lever (205). A rectifier (210) receives the input signal and provides a rectified signal (215). A prefilter (220) receives the rectified signal and attenuates high frequency components at frequencies near multiples of a decimation sample rate. The prefilter signal (225) is decimitated by a decimator (230) and low pass filtered by a low pass filter (240) having a passband below the input frequency of the input signal. The level detector can be provided to control a variable gain stage circuit which applies a gain to the input signal based on the level to form a dynamic range compressor or expander.

Un détecteur de niveau détecte le niveau d'un signal d'entrée (205). Un redresseur (210) reçoit le signal d'entrée et produit un signal redressé (215). Un préfiltre (220) reçoit le signal redressé et atténue les composantes de haute fréquence au niveau de fréquences proches de multiples d'une cadence d'échantillonnage de décimation. Le signal sortant du préfiltre (225) est mis en décimation par un décimateur (230) et filtré par un filtre passe-bas (240), dont la bande passante est au-dessous de la fréquence d'entrée du signal d'entrée. Le détecteur de niveau peut servir à commander un circuit d'étage d'amplification à gain variable appliquant un gain au signal d'entrée sur la base du niveau, de façon à former un compresseur ou un expanseur de plage dynamique.

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