Speaker and amplifier system

H - Electricity – 04 – R

Patent

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Details

H04R 3/00 (2006.01)

Patent

CA 2240026

A sound reproduction system employs an amplifier system and a speaker (40). The speaker (40) provides two negative feedback signals, one (92) indicative of the current through the speaker voice coil and a second (93) indicative of the velocity of the speaker diaphragm. The velocity signal is provided via feedback path (93) to an input of the amplifier system. The current signal (92) is provided by the second feedback path through a bandpass filter to the amplifier input. The velocity measurement may be derived from a second voice coil (42) coupled to the diaphragm, or may be derived from a piezoelectric sensor coupled thereto. The current signal may be derived from the voltage drop across a resistor (50) placed in series with the speaker voice coil (41).

Un système de reproduction sonore met en oeuvre un système d'amplification et un haut parleur (40). Le haut-parleur (40) génère deux signaux de réaction négatifs, l'un (92) indiquant que le courant passe dans la bobine mobile du haut-parleur et l'autre (93) indiquant la vitesse de la membrane du haut-parleur. Le signal indicateur de vitesse est acheminé via un chemin de contre-réaction (93) vers une entrée de l'amplificateur du système d'amplification. Le signal indicateur de courant (92) est acheminé par le second chemin de contre-réaction vers l'entrée de l'amplificateur après avoir traversé un filtre passe-bande. La mesure de la vitesse peut être extraite d'une seconde bobine mobile (42) ou d'un détecteur piézo-électrique couplé à la membrane. Le signal indicateur de courant peut être issu de la chute de tension intervenue dans une résistance (50) connectée en série à la bobine mobile (41) du haut-parleur.

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