11results about "Transducer circuit damping" patented technology

This application discloses a control method and an electronic device. The electronic device generates vibration when performing at least one function. The electronic device includes an acceleration sensor and a feedback circuit. The acceleration sensor is configured to output acceleration data, and the feedback circuit is configured to collect and feed back data related to the vibration. The electronic device obtains, based on a variation of a magnitude of the obtained acceleration data and interference data, a variation obtained after data processing, and performs action recognition. The electronic device performs a corresponding function based on a recognition result, or controls a second electronic device to perform a corresponding function. In this application, time consumption for searching for and locating a corresponding button can be shortened, and operation flexibility can be improved. In addition, when performing a function, the electronic device can accurately recognize another function to be used by the user, and eliminate interference between two or more functions.

An aircraft recorder system is provided in which a vibration sensor including at least one of a micro-electromechanical systems (MEMS) microphone and a MEMS accelerometer. The system further includes a cockpit voice recorder (CVR) and an active microphone. The active microphone and the vibration sensor each output signals to a signal processor including a subtractor configured to output, to the CVR, a signal that is a result of a subtraction of the signal from the vibration sensor from the signal from the active microphone.

In examples, a device includes audio amplifier circuitry having an input and an output. The output is configured to couple to a speaker. The device also includes sense circuitry coupled to the output and configured to sense a voltage and a current of an analog audio signal from the audio amplifier circuitry. The current indicates a back electromotive force (EMF) of the speaker. The device also includes processing circuitry coupled to the sense circuitry, which is configured to calculate an impedance of a speaker based on the voltage and the current, compare the impedance to a target impedance, and indicate an operational status of the speaker responsive to the comparison.

An electrodynamic actuator (1, 1a . . . 1k) is disclosed, which comprises a primary drive system (2a, 2b) with a primary voice coil (3, 3a . . . 3d) and a primary magnet system (4, 4a, 4b) and which comprises a secondary drive system (6) with a secondary voice coil (7) and a secondary magnet system (9). The secondary drive system (6) is arranged within the primary magnet system (4, 4a, 4b), and an inner center magnet (10) of the secondary magnet system (9) is arranged within the secondary voice coil (7). A movable part (33a . . . 33c) of the secondary drive system (6) comprises or is formed by the secondary voice coil (7) and / or the inner center magnet (10). Additionally, an electrodynamic transducer (23), an output device, a speaker (26) and a sound system (35) with such an electrodynamic actuator (1, 1a . . . 1k) are disclosed. The sound system (35) comprises an electronic sound signal circuit (36) for generation of a primary coil signal (SO1) fed to the primary voice coil (3, 3a . . . 3d) and of a phase shifted secondary coil signal (SO2) fed to the secondary voice coil (7).

Apparatus and methods for a velocity-sensing approach to loudspeaker motional feedback comprising providing a first magnetic field to couple primarily with the voice coil to drive the voice coil, providing a second magnetic field to couple primarily with the sensing winding, and sensing the voltage induced in the second, sensing winding as it reciprocates in the second magnetic field. The second magnetic field has an orientational periodicity which is circumferential in relation to the reciprocation axis and this orientational periodicity extends over at least a part of the length of the former along the reciprocation axis.

A method and apparatus are provided for reducing reaction forces in loudspeakers. The method includes providing, from a power source (312) connected to a loudspeaker (304), a current to the loudspeaker. The method also includes measuring, using a current sense resistance (308) connected in series to the loudspeaker, the current through the loudspeaker. The method further includes providing, using a voltage-controlled source (310) connected in series to the loudspeaker, a current substantially proportional to the measured current through the loudspeaker to an actuator (306), wherein the actuator is connected in series to the loudspeaker.

Embodiments of the present disclosure provide a diaphragm and an audio device. The diaphragm comprises: at least one insulating film, a plurality of conductive films, and a plurality of connecting pieces. The insulating film is provided with a magnetic pole corresponding area. Each of the conductive films is connected at least to one insulating film, the plurality of conductive films is arranged with an interval, and the magnetic pole corresponding regions are respectively arranged on the two sides of each conductive film. The plurality of conductive films is connected in series by means of the plurality of connecting pieces to form an energized circuit. According to the technical solution provided in the embodiments of the present disclosure, the at least one insulating film is connected with the plurality of conductive films arranged with an interval, and the magnetic pole corresponding regions are respectively arranged on the two sides of each conductive film, such that a conductive film having a relatively large area can be located in a relatively strong magnetic field, each conductive film also emits low-frequency sound that meets user's needs, and the conductive film can cover the high, medium and low frequency spectrum.

An amplifier includes an amplification section for amplifying a musical tone signal input from an electric musical instrument. A speaker is connected to the amplifier. The amplifier includes a storage section storing a characteristic adjustment value which is a value for adjusting an output impedance characteristic or an input impedance characteristic of the amplifier according to a characteristic of the speaker; an inspection signal output section outputting a predetermined inspection signal to the speaker via the amplification section; an observation section observing a resulting inspection signal output to the speaker by the inspection signal output section; an analysis section analyzing the characteristic of the speaker based on the resulting inspection signal observed by the observation section; and an adjustment value storage section storing, in the storage section, the characteristic adjustment value corresponding to the characteristic of the speaker analyzed by the analysis section in association with the speaker.

The present invention relates to a method and a device for controlling the propagation of acoustic waves in the vicinity of a wall, the method and device implementing a master device for controlling a set Nc of cells (1) primarily made up of a speaker (11), a set of Nm microphones (10) connected to the speaker, and a control unit (12), by means of control laws that determine the intensity of the electrical signal that must be sent to each speaker (11) so as to obtain a target determined generalized acoustic impedance for each speaker, such that a fraction of the acoustic waves is absorbed by the membrane of each speaker (11).

An audio speaker system includes: an amplifier, where a positive input terminal of the amplifier is configured to be coupled to a first reference voltage node; and a piezo diaphragm including: a metal plate; a first piezo film attached to the metal plate, where the first piezo film is configured to function as a speaker during operation of the audio speaker system; and a second piezo film attached to the metal plate and spaced apart from the first piezo film, where the second piezo film is configured to function as a microphone during operation of the audio speaker system, where an output terminal of the amplifier is coupled to the first piezo film, and where a negative input terminal of the amplifier is coupled to the second piezo film.

A linear motor magnet assembly for use in a loudspeaker unit, with a fixed base actuator component and a membrane actuating element, the membrane actuating element having a linear excursion axis. A first auxiliary magnetic element and a second auxiliary magnetic element are present, the first auxiliary magnetic element providing a first auxiliary spatial magnetic field with a major axis aligned with the linear excursion axis. The second auxiliary magnetic element is fixedly connected to the membrane actuating element of the linear motor magnet assembly and has a second auxiliary spatial magnetic field, the second auxiliary magnetic field overlapping the first auxiliary spatial magnetic field and being substantially similarly oriented as the first auxiliary spatial magnetic field over a first predetermined excursion range of the linear motor magnet assembly.