Sound Solutions International Company, Ltd.

Akg Acoustics Gmbh

Aac Technologies Pte. Ltd.

Aac Technologies (nanjing) Co., Ltd.

Knowles Ipc (m) Sdn. Bhd.

Nxp B.v.

Sound Solutions International (zhenjiang) Co., Ltd.

Xarion Laser Acoustics Gmbh

Friedrich Reining

Gustav Otto

Michael Schoffmann

Christoph Schmauder

Richard Pribyl

Franz Heidinger

Balthasar Fischer

Ernst Wintner

Hannes Breitschädel

Manuel Mefleh

Hong-Bi Dong Nguyen

Heribert Bauer

Coloman Farkas

The invention relates to a speaker () comprising a coil arrangement () with at least two voice coils (), a magnet system () and a membrane () being fixed to the coil arrangement () and the magnet system (). The membrane () has a first compliance (c) and together with the coil arrangement () causes a first resonance frequency (fres) for an oscillation of the membrane (). In addition, the speaker () comprises a second connector () with a second compliance (c), which interconnects the voice coils (). The second connector () together with the voice coils () causes a higher second resonance frequency (fres) for the oscillation of the membrane (). Moreover, the invention relates to an electronic sound signal circuit (), which is designed to output coil signals (SO, SO) having a frequency dependent phase shift (φ). In addition, invention relates to a sound system comprising an electronic sound signal circuit and a speaker of the above kind and to a method for manufacturing a coil arrangement ().

Speaker with improved frequency response and related electronic sound signal circuit, sound system and production method

The invention relates to an electromagnetic actuator, which is designed to be connected to a backside of a plate like structure and which comprises an annular coil arrangement and a magnet system being designed to generate a magnetic field transverse to the annular coil arrangement. The annular coil arrangement and the magnet system are connected to each other by a plurality of springs, which are arranged inside of the annular coil arrangement.

Electromagnetic actuator for a display with improved spring arrangement and output device with said actuator

The invention relates to an electromagnetic actuator, which is designed to be connected to a backside of a plate like structure and which comprises an annular coil arrangement and a magnet system being designed to generate a magnetic field transverse to the annular coil arrangement. The annular coil arrangement and the magnet system are connected to each other by a plurality of springs, which are arranged inside of the annular coil arrangement. Furthermore, the invention relates to an output device, comprising a plate like structure and an electromagnetic actuator of the above kind connected to a backside of the plate like structure.

An electrodynamic acoustic transducer () is disclosed, which comprises a frame and/or a housing (), a membrane (), a magnet system () with a plurality of center magnets (′) having different magnetic orientations (M. . . M) and a coil arrangement () with a plurality of voice coils (), which are movably arranged relative to the magnet system () in an excursion direction (z). The ratio is below 1, wherein wdenotes the mean width of all airgaps (E) within the magnet system (), Adenotes the sum of all airgap areas within the magnet system (), hdenotes the mean height of the center magnets (′) and Adenotes the total area of the center magnets (′). Moreover, the invention relates to an electroacoustic system (), which comprises an electrodynamic acoustic transducer () of the above kind and a control circuit (CC) connected to the coil arrangement ().

Multi magnet electrodynamic acoustic transducer and electroacoustic system

An electrodynamic actuator () is disclosed, which is designed to be connected to a plate like structure () and which comprises a coil arrangement () with at least one voice coil (), a magnet system () with a movable magnetic circuit part () and a static magnetic circuit part (F) and a spring arrangement () coupling the static magnetic circuit part (F) to the movable magnetic circuit part () and allowing a relative movement between the same. Both the spring arrangement () and the magnet system () provide a total restoring force (F) directed towards an idle position (P) of the movable magnetic circuit part (). A part of a total restoring force gradient (&#x394;F/&#x394;z) caused by the magnet system () is at least 10% of the total restoring force gradient (&#x394;F/&#x394;z) in said idle position (P) of the movable magnetic circuit part (). In addition, an output device () with the electromagnetic actuator () mounted to a plate like structure () is disclosed.

Adjustable magnetic spring for actuator

Method and electronic circuit for determining a scaling factor k for a driving force function of a model of an electrodynamic acoustic transducer having at least two voice coils. Input signal fed into the transducer and it's model cause electromotive forces. A shift for the driving force function is determined on the base of the ratios between the real electromotive forces and the modeled electromotive forces. Finally, the scaling factor k is determined on the basis of a deviation between the real electromotive forces and the modeled electromotive forces at time points where the real electromotive forces and the modeled electromotive forces each are equal. The invention moreover relates to an electronic circuit for performing the above steps, and to a transducer system with the electronic circuit and a connected transducer.

Method and electronic circuit for improving a driving force function of an electrodynamic acoustic transducer

An electrodynamic acoustic transducer () is presented, which comprises a housing (), a membrane (), a coil arrangement () attached to the membrane () and a magnet system (). The coil arrangement () comprises a plurality of coils () each having two terminals (T, T, T, T, T, T) being static in relation to the housing (). Connecting wires () connect the coils () and the terminals (T, T, T, T, T, T, T). The connecting points (C, C, C, C) between the connecting wires () and the coils () are symmetrically arranged on the coil arrangement ().

Electrodynamic acoustic transducer with improved wiring

A measuring apparatus for measuring the force factor of a dynamic loudspeaker driver comprises first and second terminals for connecting a dynamic loudspeaker driver to the measuring apparatus, an amplifier configured to generate a voltage, a voltage measuring device configured to measure the voltage present at the first terminal, a displacement measuring device configured to measure the displacement of the membrane of the dynamic loudspeaker driver with respect to the magnet, and an electric/electronic device connected between the amplifier and the first terminal. The measuring apparatus is configured to operate in a first mode of operation the amplifier to generate a voltage and to operate the electric/electronic device to have a low impedance during the first mode of operation, such that the voltage is substantially present at the first terminal in order to displace the membrane with respect to the magnet. The measuring apparatus is configured to operate the electric/electronic device to have a high impedance during a second mode of operation, such that the dynamic loudspeaker connected to the measuring apparatus moves its displaced membrane, resulting in an induced voltage generated by the dynamic loudspeaker driver and being present at the first terminal. The measuring apparatus comprises an evaluation device configured to determine the force factor of the dynamic loudspeaker driver connected to the measuring apparatus in response to the measured displacement of the membrane and the induced voltage measured by the voltage measuring device during the second mode of operation.

Measuring apparatus for measuring the force factor of a dynamic loudspeaker driver

An electrodynamic acoustic transducer () is presented, which comprises a housing (), a membrane (), a coil arrangement () attached to the membrane () and a magnet system (). The coil arrangement () comprises a plurality of coils () each having two terminals (T, T, T, T, T, T, T) being static in relation to the housing (). At least one pair of coils () has one terminal (T) in common, whereas the remaining terminals (T, T, T, T, T, T) are individual terminals (T, T, T, T, T, T). Connecting wires () connect the coils () with the individual terminals (T, T, T, T, T, T), and a conductive layer or path () attached to the membrane () electrically connects the coils () with the common terminal (T).

Electrodynamic acoustic transducer with conductive membrane for coil connection

A transducer system, comprising an electrodynamic acoustic transducer () with a membrane (), a plurality of voice coils () electrically switched in series, and a magnet system () is presented, wherein just an outer tap/terminal (T) of the serially connected voice coils () is electrically connected to an audio output of an amplifier (). Moreover, a method for feeding a sound signal to an electrodynamic acoustic transducer () is presented, wherein the voice coils () are driven by an audio signal just via an outer tap/terminal (T) of the serially connected voice coils ().

System and method for applying a sound signal to a multi coil electrodynamic acoustic transducer

A method for avoiding an offset of a membrane () of an electrodynamic acoustic transducer () having two voice coils () is presented, wherein a control voltage (U) is applied to at least one of the voice coils () until the electromotive force (U) of the first coil () or a parameter derived thereof and the electromotive force (U) of the second coil () or a parameter derived thereof substantially reach a predetermined relation. Furthermore, an electronic offset compensation circuit () is presented, which performs the above application of a control voltage (U). Finally, the invention relates to a transducer system with a transducer () and an electronic offset compensation circuit () connected to the transducer ().

Method for avoiding an offset of a membrane of a electrodynamic acoustic transducer

An audio system comprising an electro-acoustic transducer having two stacked voice coils mechanically linked to a membrane. The voice coils are oscillatingly suspended in the magnetic field of a permanent magnet focused by a pole plate and are mechanically arranged symmetrical to the pole plate while in a rest position. The audio system further comprises two driver circuits connected to the electro-acoustic transducer.

Double coil speaker

The invention relates to a new audio transducer for mobile devices, in particular a micro speaker for use in mobile phones, tablets, gaming devices, notebooks or similar devices, that comprises two figure-8 shaped coils to compensate tumbling passively or to detect and compensate actively rocking modes of the membrane along the two axes perpendicular to the axis of piston-wise movement of the membrane using a detection coil and a damping coil per axis. An amplifier may be used to amplify the detection signal in order to increase the damping effect. Electrical rocking mode compensation replaces state of the art damping mechanisms which are based on damping materials added in the moving part of the membrane. Due to the independence of environmental conditions electrical damping outperforms existing damping techniques.

Electric rocking mode damper

A microphone comprises a sound inlet, a first MEMS microphone structure comprising a first membrane and associated backplate in the path of the sound inlet and a second MEMS microphone structure comprising a second membrane and associated backplate stacked with respect to the first microphone membrane, with an enclosed space between the first and second membranes.

Microphone

A device comprising measurement () and reference () interferometers is disclosed. Each interferometer is configured to receive light from the same light source () and to emit light to respective detectors () and has a respective operating point. The measurement interferometer () is configured to respond to variations in a physical parameter by varying the intensity of light emitted, whereas the reference interferometer () is configured to be unresponsive to variations in the physical parameter. The device further comprises a signal processor for generating a differential output signal depending on respective output signals generated by the detectors ().

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Vienna, Austria

Friedrich Reining