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AssigneesWhylot SAS, Universite Du Maine, Cnrs
InventorsEtienne Gaviot, Mehran ERZA, Frédéric POLET, Lionel CAMBERLAIN, Romain RAVAUD
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The present invention relates to an acoustic signal supply circuit of at least one loudspeaker (HP) incorporating a filtering device of the resonance peak of said at least one loudspeaker (HP) occurring at a given frequency, characterized in that the filtering device of the resonance peak of said at least one loudspeaker (HP) is incorporated either into the first instrumentation ground circuit or in the feedback loop, this filtering device being purely electrical in the form an impedance incorporated in the first instrumentation ground circuit or in the feedback loop, the impedance parameters being predetermined as a function of the resonance peak to be filtered of said at least one loudspeaker (HP).
An acoustic signal supply circuit of at least one loudspeaker incorporating a filtering device of the resonance peak of said at least one loudspeaker occurring at a given frequency of the supply current of said at least one loudspeaker, said circuit comprising at least one non-inverting converter arranged upstream of said at least one loudspeaker having a positive supply terminal connected to the input power circuit and a negative supply terminal, said circuit comprising also, at the output of said at least one loudspeaker, a first instrumentation ground circuit bypassing a feedback loop connecting a point in the circuit downstream of the loudspeaker to the negative supply terminal of the non-inverting converter, the filtering device of the resonance peak of said at least one loudspeaker being purely electrical in the form of an impedance incorporated either in the first instrumentation ground circuit or in the feedback loop, the impedance parameters being predetermined as a function of the resonance peak to be filtered of said at least one loudspeaker, characterized in that:
The circuit according to the preceding claim, wherein, when the impedance is incorporated into the first instrumentation ground circuit, the values of said at least one first capacitor, said at least one first resistor and said at least one first inductor are calculated according to the parameters of the at least one loudspeaker, namely the fm:Mm ratio representative of mitigation and the km:Mm ratio representative of the square of the resonance angular frequency of the at least one loudspeaker according to the following equations:
The circuit according to the preceding claim, wherein the dead resistor value is calculated according to the following equation:
The circuit according to the preceding claim, wherein, when the impedance is incorporated into the feedback loop, a second instrumentation ground circuit is arranged between the second impedance and the converter, the first and second instrumentation ground circuits respectively incorporating a first dead resistor for the first instrumentation ground circuit and a second dead resistor for the second instrumentation ground circuit.
The circuit according to the preceding claim, wherein a calibration of the device is performed based on the value of the first dead resistor, the value of the second resistor of the second impedance being determined based on the value of the first dead resistor by being 10 to 100 times greater than the value of the first dead resistor, the value of the second dead resistor being 2 to 30 times greater than the value of the first dead resistor.
A control method according to the preceding claim, wherein the overall resonance factor of the loudspeaker and of the filtering device is set to a Butterworth filter.
A control method according to the preceding claim, wherein, said at least one loudspeaker having a diaphragm, a reduction in the sound level in the highest frequencies in the direction of the perpendicular axis of the diaphragm of said at least one loudspeaker is carried out simultaneously to the filtering of the resonance peak.
A control method according to the preceding claim, wherein the reduction of the sound level takes place upstream of said at least one loudspeaker.
Dependencies are inferred from the claim text.