219results about "Transducer circuit damping" patented technology

An audio system receives sounds from a local area with a set of sensors. The audio system analyzes the sounds to identify an amount of background noise in the environment. The audio system may also identify target sound in the environment, such as voice from a nearby speaker, to reinforce. The amount of background noise is then used to adaptively set a level of reinforcement for the target sound. In low-noise environments, the target sound may be minimally, or not reinforced, while in high-noise environments a reinforcement sound signal may be generated with the target sound so that a transducer array may generate reinforcing sounds for the target sound and increase its contrast with the noise in the environment. By applying the reinforcement dynamically, the system automatically adjusts for different sounds and environments.

A system comprises an ear-worn electronic device configured to be worn by a wearer. The ear-worn electronic device comprises a processor and memory coupled to the processor. The memory is configured to store an annoying sound dictionary representative of a plurality of annoying sounds pre-identified by the wearer. A microphone is coupled to the processor and configured to monitor an acoustic environment of the wearer. A speaker or a receiver is coupled to the processor. The processor is configured to identify different background noises present in the acoustic environment, determine which of the background noises correspond to one or more of the plurality of annoying sounds, and attenuate the one or more annoying sounds in an output signal provided to the speaker or receiver.

Electroacoustic drivers that can be utilized in loudspeaker systems that utilize drivers having a magnetic negative spring (MNS). The magnets of the MNS can be arranged for radial stability and / or to provide for linear magnetic forces. A variable reluctance device can be used to vary the resonant frequency of electroacoustic driver in response to a feedback signal.

The disclosed computer-implemented method may include applying, via a sound reproduction system, sound cancellation that reduces an amplitude of various sound signals. The method further includes identifying, among the sound signals, an external sound whose amplitude is to be reduced by the sound cancellation. The method then includes analyzing the identified external sound to determine whether the identified external sound is to be made audible to a user and, upon determining that the external sound is to be made audible to the user, the method includes modifying the sound cancellation so that the identified external sound is made audible to the user. Various other methods, systems, and computer-readable media are also disclosed.

Features described herein generally relate to detecting and correcting audible distortion due to speaker port occlusion. Particularly, an audio signal is output, an impedance curve for the audio signal is calculated, a change in a resonance frequency for the speaker based on an impedance curve model for the speaker and the impedance curve for the speaker is detected, and a gain of the amplifier is set based on the detected change in the resonance frequency for the speaker.

The disclosed computer-implemented method may include applying, via a sound reproduction system, sound cancellation that reduces an amplitude of various sound signals. The method further includes identifying, among the sound signals, an external sound whose amplitude is to be reduced by the sound cancellation. The method then includes analyzing the identified external sound to determine whether the identified external sound is to be made audible to a user and, upon determining that the external sound is to be made audible to the user, the method includes modifying the sound cancellation so that the identified external sound is made audible to the user. Various other methods, systems, and computer-readable media are also disclosed.

A MEMS transducer 100, 200 is proposed, preferably configured as a vertical MEMS loudspeaker. The MEMS transducer 100, 200 comprises: a stationary unit 110 and a movable displacement unit 105, which are coupled together, a combination unit comprising a damping unit 235 and / or a drive unit, wherein the combination unit is arranged between the stationary unit 110 and the movable displacement unit 105, wherein the movable displacement unit 105 and / or the damping unit 235 of the combination unit are designed to interact with a fluid 140 surrounding the stationary unit 110 and / or the displacement unit 105 and / or the damping unit 235 of the combination unit, and wherein the combination unit comprising damping unit 235 is designed to effect an essentially linear damping behavior of the MEMS transducer 100, 200, i.e. a damping behavior independent of a deflection 10 of the displacement unit 105, based thereon.

The present invention provides a microphone amplifying circuit including an amplifier, a bias resistor, an input end, an output end, a microphone capacitor, a first parasitic capacitor and a second parasitic capacitor. The first parasitic capacitor is connected to the input end, and the other end of the first parasitic capacitor is connected to the output end. The second parasitic capacitor is connected to the output end, and the other end of the second parasitic capacitor is grounded. The first parasitic capacitor and the second parasitic capacitor are formed after adding a layer of underlying metal between the substrate of the integrated circuit and the welding plate. Compared with the related art, the microphone amplifying circuit design method and the microphone amplifying circuit of the present invention have higher signal to noise ratio and better performance.

The invention provides a construction machine and a control system of the construction machine, which can improve silence. A construction machine according to one embodiment of the present invention is provided with: a lower traveling body; an upper rotating body rotatably mounted on the lower traveling body; the cab is arranged on the upper revolving body; an outer sound collection device disposed on the outer side of the cab; an inner sound output device disposed on the inner side of the cab; and a control device that restricts the sound collected by the outer sound collection device from being output from the inner sound output device on the basis of the detection result of an object present in the periphery of the construction machine.

The present disclosure relates to "vibration and force cancelling transducer assemblies." An acoustic device is disclosed that includes a housing having a housing wall defining a housing volume; a first mass movably coupled to the housing, the first mass including a sound radiating surface, a voice coil, and a first suspension member; a second mass movably coupled to the housing, the second mass including a magnet assembly and a second suspension member, and wherein the first suspension member couples the first mass to the second mass, the second suspension member couples the magnet assembly to the housing wall, and the second suspension member is tuned to reduce housing vibrations caused by movement of the first mass and the second mass relative to the housing.

An acoustic apparatus includes a class-D amplifier including a current feedback circuit, and a speaker system including a voice coil driven by the class-D amplifier. The speaker system is configured such that, in a case where the speaker system is driven by an ordinary amplifier having a first output resistance lower than a second output impedance of the class-D amplifier, a Q factor of the speaker system falls below a predetermined lower limit of an ordinary Q factor range of an ordinary speaker system. The current feedback circuit is configured to increase the second output impedance of the class-D amplifier by feeding a current flowing to the voice coil back to an input of the class-D amplifier so as to increase a Q factor as the acoustic apparatus higher than the predetermined lower limit of the ordinary Q factor range and within the ordinary Q factor range.

The present disclosure relates to a portable device and an operating method thereof. For example, the portable device includes a microphone structure configured to convert a received audio signal into an electronic signal representing the received audio signal, and to transmit and receive ultrasonic waves by emitting ultrasonic waves and receiving reflections of the ultrasonic waves. The portable device also includes a control unit configured to evaluate the reflections of the ultrasonic waves to obtain an evaluation result, and to control the operation of the portable device based on the evaluation result.

The embodiments of the present invention provide a microphone amplifier circuit, a microphone circuit, and an electronic device. The microphone amplifier circuit comprises a first transistor, a first constant-current source, and a source follower. A gate electrode of the first transistor serves as an input end of the microphone amplifier circuit, a source electrode of the first transistor serves as an output end of the microphone amplifier circuit, and a drain electrode of the first transistor is grounded. An input end of the first constant-current source is connected to a power supply, and an output end of the first constant-current source is connected to the source electrode of the first transistor. The source follower at least comprises a second transistor. A drain electrode of the second transistor is connected to the power supply, a gate electrode of the second transistor is connected to the source electrode of the first transistor, and a source electrode of the second transistor is connected to the drain electrode of the first transistor. The present invention at least facilitates an improvement to the THD performance of microphone amplifier circuits.

To provide "a displacement detection calibration method of a speaker, a displacement detection device of a speaker, and a speaker unit" capable of accurately detecting a displacement.SOLUTION: A magnetic angle sensor 212 outputs: a component Vs in a Y direction where a vibration system of a synthetic vector of a magnetic vector of a magnetic circuit 220 of a speaker 2 and a magnetic vector of a displacement detection magnet 211 fixed on the vibration system of the speaker 2 is vibrated; and a component Vc of a X direction orthogonal to the Y direction. A test signal is applied to the speaker 2, a collection of (VS and VC) and a measurement of a Y-direction displacement of the vibration system by a displacement meter 72 are performed. A conversion formula: z=a1×Vs+a2×Vc for a first principle component z is obtained by principle component analysis on the collected (VS and VC), and a conversion formula: y=b1×z2+b2×z+b3 for conversion to the displacement y is obtained by polynomial regression on the Y-direction displacement y of the displacement detection magnet 211 obtained from a measurement value of the displacement meter 72 and the z calculated from the collected (VS and VC).SELECTED DRAWING: Figure 1

Electrical circuitry adapted to drive a dual-coil loudspeaker having a primary voice coil and a second voice coil connected in parallel with the primary voice coil, the second voice coil being in series with an LC resonant circuit of impedance Zmf, further comprising an inductance compensation filter of impedance Zif in parallel with the LC resonant circuit.

The invention relates to a method and a device for controlling the propagation of sound waves in the vicinity of a wall, the method and the device implementing, by means of a control law, a master device for controlling a set of Nc elementary cells (1) mainly composed of a loudspeaker (11), a set of Nm microphones (10) connected to the loudspeaker and a control unit (12), the control law determining an electrical signal to be sent to each loudspeaker (11) to obtain a target generalized acoustic impedance determined for each loudspeaker, so that a portion of the sound waves is absorbed by the membrane of each loudspeaker (11).

The present invention addresses the problem of providing a "speaker output characteristic correction system and sound system" which correct the output characteristic of a speaker to a target output characteristic with high accuracy. [Solution] A control filter (61) convolves a sound source output signal u (n) with a reverse transmission characteristic G-that is a transmission characteristic of a sound pressure level at a predetermined sound reception point (M) and a target transmission characteristic H that is a target sound pressure level, and outputs the convolved sound source output signal through an amplifier (4). The speaker (2) is provided with a sensor (3) for detecting the displacement of the vibration system. A transfer characteristic setting unit (62) sets a reverse transfer characteristic G-in accordance with each parameter of an equivalent circuit of the speaker (2) determined on the basis of the detected displacement. Thereafter, the transmission characteristic setting unit (62) periodically determines a change in the parameter on the basis of the detected displacement, and updates the inverse transmission characteristic G-so as to match the determined changed parameter.

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

Disclosed are an electronic device for controlling a temperature of a speaker and a method of controlling the electronic device. The electronic device includes a sensor configured to detect an outside air temperature, a speaker configured to output a sound, and at least one processor. The at least one processor predicts energy of the sound. The at least one processor predicts an amount of an increase or decrease in temperature of the speaker from the predicted energy of the sound. The at least one processor predicts a predicted temperature of the speaker on the basis of the outside air temperature and the amount of the increase or decrease in temperature of the speaker. The at least one processor maintains a temperature of the speaker to a threshold temperature or lower on the basis of the predicted temperature and the threshold temperature of the speaker.

A speaker distortion correction device includes an amplifier configured to drive a speaker; and a distortion corrector. An input signal is input to the distortion corrector, and an output of the distortion corrector is input to the amplifier. The distortion corrector includes a nonlinear distortion controller configured to generate a corrected signal obtained by performing a nonlinear distortion correction process on the input signal so that nonlinear distortion of the speaker is suppressed when the corrected signal is input to the amplifier; a maximum value calculating section configured to calculate a maximum output value of the amplifier to be obtained when the corrected signal is input to the amplifier, based on at least the input signal; and a selector configured to select the corrected signal when the maximum output value does not exceed a predetermined threshold and select the input signal when the maximum output value exceeds the predetermined threshold.

A method for detecting acoustic feedback in a vehicle audio system including at least one microphone and one loudspeaker. The method includes the steps of computation of an acoustic acuity indicator for each frame of a plurality of successive audio frames captured by the microphone, detection of acoustic feedback when the indicator increases monotonically for a predetermined length of time, and application of a resolution strategy when acoustic feedback is detected.Buchanan

A speaker includes: a drive-and-support part having a frame; a vibrating part supported by the frame such that the vibrating part is able to vibrate; a magnetic drive part configured to make the vibrating part vibrate; a detection magnet provided in one of the drive-and-support part or the vibrating part; a first magnetic sensor and a second magnetic sensor provided in the other one of the drive-and-support part or the vibrating part, and configured to detect a magnetic field produced by the detection magnet; and a detection circuit configured to determine a difference between a first detection output of the first magnetic sensor and a second detection output of the second magnetic sensor. The first and second magnetic sensors are spaced apart from each other in a direction in which the vibrating part vibrates.

This acoustic device comprises: a diaphragm; a movable part having coils and connected to the diaphragm; and a magnetic circuit part comprising a magnet and a yoke, generating a magnetic force acting on the coils. The magnetic circuit part has, as part of the yoke, an upper plate part having an upper surface portion extending in a direction substantially orthogonal to the direction in which the movable part is movable and positioned above the magnet. The upper plate part has a projection extending downward from an inner edge portion or an outer edge portion of the upper surface portion. The movable part comprises, as coils, a first coil and a second coil.The winding sections of the first coil and the second coil in the moving part are opposite a projection-side side surface, which is a side surface on the side of the upper plate part on which the projection is formed.

To provide a speaker which is capable of feedback control by detecting a movement state of a movable part including a diaphragm.SOLUTION: In a speaker 1, a vibration part includes a diaphragm 3 and a bobbin 6, and a voice coil 7 is fixed to the bobbin 6. A detection part 20 has a movable magnet 21 and a magnetic sensor 22. The magnetic sensor 22 is located within a space surrounded by the bobbin 6, and the movable magnet 21 is fixed to the outer face of the bobbin 6. Because the magnetic sensor 22 is located inside the bobbin 6, the movable magnet 21 and the damper member 5 do not come into contact with the magnetic sensor 22 even when the movable magnet 21 and damper member 5 greatly move rearward.SELECTED DRAWING: Figure 2

A system comprises an ear-worn electronic device configured to be worn by a wearer. The ear-worn electronic device comprises a processor and memory coupled to the processor. The memory is configured to store an annoying sound dictionary representative of a plurality of annoying sounds pre-identified by the wearer. A microphone is coupled to the processor and configured to monitor an acoustic environment of the wearer. A speaker or a receiver is coupled to the processor. The processor is configured to identify different background noises present in the acoustic environment, determine which of the background noises correspond to one or more of the plurality of annoying sounds, and attenuate the one or more annoying sounds in an output signal provided to the speaker or receiver.

A voice controlled assistant has a housing to hold one or more microphones, one or more speakers, and various computing components. The housing has an elongated cylindrical body extending along a center axis between a base end and a top end. The microphone(s) are mounted in the top end and the speaker(s) are mounted proximal to the base end. The microphone(s) and speaker(s) are coaxially aligned along the center axis. The speaker(s) are oriented to output sound directionally toward the base end and opposite to the microphone(s) in the top end. The sound may then be redirected in a radial outward direction from the center axis at the base end so that the sound is output symmetric to, and equidistance from, the microphone(s).

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 obstacle monitoring system includes a transducer that receives an ultrasonic echo from an obstacle and generates a signal based on the echo. The system further includes a controller coupled to the transducer that is calibrated based on a frequency response of the transducer and a coupling circuit. The system further includes circuitry generating a damping current, controlled by the controller, that reduces or eliminates reverberation of the transducer.

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.

To improve efficiency η of the entire acoustic device including an amplifier over the entire frequency band including a minimum resonance frequency F0.SOLUTION: An acoustic device 10 includes: a class D amplifier 1; and a speaker system SS comprising a voice coil to be driven by the class D amplifier 1. The class D amplifier 1 comprises a current feedback circuit 200. The speaker system SS has a Q value lower than the lower limit value of a proper range. The current feedback circuit 200 increases the acoustic device 10's Q value to a value in the proper range by increasing output resistance of the class D amplifier via feedback of current flowing through the voice coil to an input unit of the class D amplifier 1.SELECTED DRAWING: Figure 1