Abstract: The speaker comprises a magnetic circuit. The speaker comprises mobile equipment that is movable relative to the magnetic circuit. The spool holder is mounted movably through air gaps and a guide element of the mobile equipment is arranged between the mobile equipment and a frame, on the side of a membrane relative to the magnetic circuit. The mobile equipment passes all the way through the magnetic circuit through end air gaps. The speaker includes a complementary guide element, arranged between the mobile equipment and the frame, on the side opposite the membrane relative to the magnetic circuit.

Abstract: Infinite acoustic baffle (10) comprising a box (12) and a loudspeaker (20) comprising a membrane (22) that is movable relative to the box (12), the box (12) and the membrane (22) defining a substantially closed baffle chamber (14); the loudspeaker (20) comprising an electrically controlled motor (30) for actuating the membrane (22) that is able to move relative to the box (12), the baffle also comprising a mechanism (50) for axially urging the membrane (22) away from its median rest position counter to the pressure force exerted on the membrane (22) by the gas contained in the box (12) characterized in that the mechanism (50) comprises a cam (54) that is movable relative to the box (12) along an axis (X-X) for displacing of the cam under the displacement action of the membrane (22) and at least one cam follower (58A, 58B) that is biased transversely to the cam (54) by at least one spring (60A, 60B) and bears on the cam (54), the cam (54) having at least one cam surface (56A, 56B) capable of converting the tra

Abstract: The headphones (10) comprise: a transducer (16) (12); an noise-canceling processing chain (30, 40) comprising: a microphone (31, 41); a noise-canceling processing filter (34, 44) which comprises in series: a stabilisation filter (34A, 44A) whose transfer function is substantially equal to the inverse of the transfer function of the processed secondary path, and a noise cancellation filter (34B, 44B) whose transfer function is a noise cancellation transfer function. The secondary path is formed between the transducer (16) and the eardrum, and the transfer function of the processed secondary path is the transfer function of the secondary path combined with the transfer functions of the processing components, excluding the processing filter (34, 44).

Abstract: A loudspeaker (10) comprising a magnetic circuit (12), and a mobile assembly (14) along an axis (D) comprising: a rigid membrane (42) defining an external diameter (D3), a first reel holder (44) and a second reel holder (46), at least a first coil (22) and a second coil (24) located in a first air gap (18) and a second air gap (20) of the magnetic circuit respectively. The first coil holder and the second coil holder form a first junction (54) and a second junction (56) with the membrane, concentric and defining a first diameter (D1) and a second diameter (D2) greater than the first. The second diameter is: less than 97% of the external diameter, or greater than or equal to 97% of the external diameter, the first diameter being greater than 40% of the external diameter.

Abstract: An acoustic system (1) for diffusing sound from N channels (Si) comprising audio frequencies, N being greater than or equal to two, the acoustic system comprising a frame (5), M loudspeakers (HPj) which are similar to each other and mounted on the frame (5), and a processing unit (20) designed to send M loudspeaker signals (SSj) to the loudspeakers respectively. The loudspeakers are arranged at an angle about an axis (Z), two successive loudspeakers forming an angle (a) substantially equal to 360° divided by M.

Abstract: 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.

Abstract: The electrodynamic loudspeaker (10), comprising: a fixed frame (12), a motor including a fixed base (14) connected to the fixed frame (12) and a part (16) movable axially relative to the fixed base (14) along an axis (A-A?), a convex membrane (18), the convexity of which is oriented toward the outside of the loudspeaker (10), and a truss (20) connecting the convex membrane (18) and the moving part (16). The truss (20) comprises an inner ring (46) and an outer ring (48) that are coaxial, connected to one another by radial pillars (50) and a crown (52) for fastening to one end (53) of the moving part (16), the convex membrane (18) being fastened bearing on the inner and outer rings (46, 48).

Abstract: An acoustic speaker (1) including: a metal armature (7), a plastic shell (9) fastened on the armature, the shell defining at least two openings (11A, 11B), and at these two loudspeakers (13A, 13B) arranged head to tail along a transverse axis (T), the two loudspeakers respectively extending through the two openings. The shell is in one piece, and the shell and an outer part (19) of the armature are suitable for nesting in one another along a longitudinal axis (L), the outer part and the shell at least partially defining an inner volume (23) of the acoustic speaker.

Abstract: The present invention relates to a device (22) for controlling a loudspeaker in an enclosure, the device (22) comprising: a unit (36) for duplicating a desired dynamic signal (Sdyn) to obtain two identical desired dynamic signals (Sdyn1, Sdyn2), a first processing unit (38) configured to process the first desired dynamic signal (Sdyn1) to obtain a first processed signal (Sdyn1?) whereof the frequencies are less than or equal to a predetermined frequency, a second processing unit (40) configured to process the second desired dynamic signal (Sdyn2) to obtain a second processed signal (Sdyn2?) whereof the frequencies are strictly greater than the predetermined frequency, and a unit (42) for combining the processed first and second signals (Sdyn1?, Sdyn2?) to obtain a control signal (Scommande) of the loudspeaker.

Abstract: An acoustic speaker (1), comprising: a metal frame (3), a plastic shell (5) fastened on the frame, the shell defining at least two openings (7A, 7B), at these two loudspeakers (9A, 9B) arranged back-to-back along a transverse axis (T), the two loudspeakers respectively extending through the two openings. The frame comprises an inner part (21) located transversely between the two loudspeakers and on which the two loudspeakers are fastened.

Abstract: The present invention relates to an amplification device (10) of an input signal comprising: a first amplification stage (12), a second amplification stage (14), each amplification stage (12, 14) comprising: a switching circuit (22), the switching circuit (22) being able to generate, as output (22A, 22B), a switched signal having at least two states, and an inductive element (24) able to smooth the switched signal to obtain a smoothed signal (I1, I3), the smoothed signal (I1, I3) having a useful component and a stray component. The amplification device (10) further comprises a compensation circuit (16), for each amplification stage (12, 14), able to generate a compensation signal (I2, I4) of the stray component of the smoothed signal (I1, I3) generated in the inductive element (24) of the corresponding amplification stage (12, 14).

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: This control device for controlling a loudspeaker (14) in a loudspeaker enclosure, comprises: an input for an audio signal to be reproduced; a supply output for supplying an excitation signal for the loudspeaker; the calculation means (26, 36, 38, 70, 71, 80, 90) for calculating, at each time instant (t), at least one predicted current (iref(t)) for the excitation signal for the loudspeaker (14) as a function of the audio signal. It comprises an attenuator (71) 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.

Abstract: 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.

Abstract: 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 (??) situated facing the mobile membrane, which comprises a peripheral edge (?) 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 (??) of the peripheral edge (?) 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?) situated on the internal edge at a location such that the distance between the first point (M) and second point (M?) 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.