Devialet

Nortel Networks Corporation

Pierre-Emmanuel Calmel

Alexandre Huffenus

Antoine Petroff

Eduardo Mendes

Jean-Loup Afresne

Emmanuel David Nardin

Charles Coqueret

Mathias Moronvalle

Maxime Leblanc

Julien Bergère

Patrick LaGrange

Fabrice Robert

Nicolas Regentête

Antonio Oliveira

Quentin Sannié

Julien Bergére

Frédéric Lepoutre

Jean-Loup Nat Afresne

David Aimé Pierre Gras

Julien Laurent Bergere

Valérie Fontanes

Antoine Sannie

Mathieu Pernot

Manuel De La Fuente

Frederic Lepoutre

Julien Bergere

Julien BERGÈRE

A speaker including a supporting structure, a diffusion membrane that is movable relative to the supporting structure, a motor for actuating the diffusion membrane, including a movable unit relative to the supporting structure, the movable unit being mechanically connected to the diffusion membrane for synchronized movement thereof, and a hydraulic circuit interposed between the movable unit and the diffusion membrane, the diffusion membrane and the movable unit each including a movable piston surface, interacting with a fluid of the hydraulic circuit.

Low inertia speaker

The present invention relates to an amplification device () of an input signal comprising: The amplification device () further comprises a compensation circuit (), for each amplification stage (), able to generate a compensation signal (I, I) of the stray component of the smoothed signal (I, I) generated in the inductive element () of the corresponding amplification stage ().

Amplifying device comprising a compensation circuit

A method for controlling an operating parameter of an acoustic apparatus, including implementing a screen displaying at least one window including a cursor able to occupy positions relative to a reference of the window, the positions representing values of the operating parameter between a minimal and a maximal value, displaying the cursor in an initial position relative to the reference representative of an initial value of the operating parameter, acquiring an elementary command from an operator, moving the cursor with respect to the reference as a function of the elementary command, from the initial position to a final position in order to select a final value of the operating parameter in a range of selectable values containing the initial value, and sending the selected value to the acoustic apparatus, wherein the range of selectable values has an amplitude strictly less than the difference between the maximum and the minimum values.

Method for controlling an operating parameter of an acoustic apparatus

Disclosed is the audio amplifier comprising an input for an audio signal to be amplified and an output for powering a load on the basis of the amplified audio signal; a generator of reference voltage of very high linearity and low output impedance, able to receive, as input, the audio signal to be amplified; a power current generator comprising a power voltage generator whose output is connected to the output of the reference voltage generator through a coupling impedance. The coupling impedance comprises two coupling inductances mounted in series between the output of the reference generator and the output of the power voltage generator and an attenuation impedance linking a mid-point between the two coupling inductances and a reference potential, wherein the attenuation impedance includes an attenuation inductance.

Very high fidelity audio amplifier

A switching power supply is provided which includes an input for an input current at an input voltage, a controlled transistor bridge having two branches each with two transistors, the two branches being connected in parallel to the input terminals, a transformer having a primary connected between the midpoints of the two branches formed between the transistors of each branch, an output for an output current connected to the terminals of a secondary circuit of the transformer, and a control unit for the transistors to alternately switch each of the midpoints between high and low values with a time offset between the switching times of the midpoint values. The control unit is also capable of ensuring that the time order for switching of the midpoints between the high and low values thereof varies over the course of time.

Switching power supply with controlled transistor bridge

This control device for controlling a loudspeaker () in a loudspeaker enclosure, comprises: It comprises an attenuator () that is capable of limiting the predicted current to a limited current value that is lower than a ceiling value by application, to the predicted current, of an attenuation gain which is a function of the predicted current.

Device for controlling a loudspeaker with current limitation

A method is provided for adapting an applied volume gain in an audio amplifier controlling at least one loudspeaker of an enclosure according to a desired volume gain selected by a user on a scale increased by a maximum desired volume gain, including determining effective intensity applied to the loudspeaker, calculating maximum volume gain from the desired volume gain, an effective intensity applied to the at least one loudspeaker, thermal characteristics of the loudspeaker, and the maximum desired volume gain, then calculating a variable applied volume gain according to an increasing monotonic function providing a variable applied volume gain according to the desired volume gain such that the image of the maximum desired volume gain by the monotonic function is equal to the maximum volume gain, and applying to the amplifier as applied volume gain, the minimum of the desired volume gain and the variable applied volume gain.

Method for adapting the volume gain for the power limitation of an amplifier and amplifier

Loudspeaker enclosure comprising at least one loudspeaker having a convex mobile membrane, and a member surrounding the mobile membrane and comprising an external surface bounded by an internal edge (&#x393;') situated facing the mobile membrane, which comprises a peripheral edge (&#x393;) situated facing the internal edge of the member and forming a closed loop. The mobile membrane and the member have a suitable shape such that, over a continuous portion (&#x393;&#x2033;) of the peripheral edge (&#x393;) representing at least 25% of the length of the peripheral edge, for any first point (M) on the continuous portion and any second point (M&#x2032;) situated on the internal edge at a location such that the distance between the first point (M) and second point (M&#x2032;) is minimal, the mobile membrane has, at the first point, a first tangent plane, essentially coincident with a second tangent plane at the second point.

Loudspeaker enclosure with at least one loudspeaker with a convex mobile membrane exhibiting continuity of shape with an adjacent member

An acoustic enclosure (), comprising: The motor and the electronic circuit are connected to a same member () of the acoustic enclosure. The member conducts heat and includes an exchange surface () able to be traversed by a heat flow () circulating in the member originating from the motor and the electronic circuit when the acoustic enclosure is operating, the heat flow being intended to dissipate in the air () outside the acoustic enclosure or to pass into a heat-conducting element outside the acoustic enclosure.

Acoustic enclosure comprising a non-heat-conducting external wall, an electrodynamic loudspeaker and an electronic control circuit

The invention relates to an audio processing device () including:

Audio processing device

An audio amplifier has an input for an audio signal being amplified and an output powering a load on the basis of the amplified audio signal; a generator of reference voltage of very high linearity and low output impedance, able to receive, as input, the audio signal to be amplified; a power current generator including a power voltage generator whose output is connected to the output of the reference voltage generator through a coupling inductance; and a signal adder introducing, for its control, as input to the power current generator, a signal representative of the current provided as output by the reference voltage generator. The signal adder is able to introduce a signal representative of the product of the value of the coupling inductance and the drift with respect to time of the current provided to the load.

Audio amplifier

A method is provided for producing a volume gain applied by an amplifier to at least one audio signal according to a desired volume gain selected by a user, which includes calculating a standardized total slow sound level from at least one audio signal, calculating maximum slow volume gain and minimum slow volume gain as the quotient of the product of the desired volume gain by maximum slow gain, respectively by minimum slow gain, divided by the standardized total slow sound level, determining a first minimum out of the desired volume gain and the maximum slow volume gain, determining a second minimum out of the desired volume gain multiplied by a maximum volume gain and the minimum slow volume gain, determining as a slow volume gain the maximum of the first and second previously determined minima, and calculating the volume gain according to the slow volume gain.

Amplifier with adjustment of the automatic sound level

This electroacoustic conversion chain comprising at least one loudspeaker, this loudspeaker comprising means for generating a magnetic field in a magnetic circuit having an air gap and a membrane secured to turns of a conducting material which may move in this air gap, is characterized in that it comprises at least one control module comprising at least one input for conveying a signal to be broadcast and at least one output connected to a turn, the control module being able to apply to said or each output an excitation signal depending on the position of at least one turn relatively to the air gap.

Electroacoustic conversion chain with selectively powered coil

The input stage () of a high-fidelity amplifier () with high linearity and a low distortion rate comprises: &#x2014;an input () for the digital signal to be converted;&#x2014;a voltage output () for the converted voltage;&#x2014;a digital/analog converter (), the input of which forms the input () for the digital signal to be converted, the digital/analog converter () having access to a signal terminal ();&#x2014;a voltage current conversion resistor () arranged between the voltage output () and a reference potential; and&#x2014;a current/voltage converter () that has a voltage output and is arranged between the signal terminal () and the voltage outlet (). The current/voltage converter () comprises a transistor (). The source of the transistor () is only connected to the signal terminal () of the digital/analog converter ().

Input stage of an amplifier and corresponding amplifier

The present invention concerns a synchronization method for synchronizing at least two systems for rendering multimedia streams, the method comprising:

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Le Chesnay, France

Pierre-Emmanuel Calmel