Abstract: A sound producing package structure includes a shell and a chip. The shell includes a top structure, a bottom structure and a sidewall structure. The chip is disposed inside the shell and configured to produce an acoustic wave, wherein the chip includes a thin film structure and an actuator configured to actuate the thin film structure, and the thin film structure is substantially parallel to the top structure and the bottom structure. A first opening is formed on the sidewall structure, and the acoustic wave propagates outwards through the first opening.

Abstract: An application processing method for providing a group video call and a terminal for performing a group video call are disclosed. The application processing method of providing a group video call may include executing a group video call comprising a plurality of participants, based on a number of the participants, displaying views corresponding to the participants by pagination, based on a predetermined action of a first participant whose view is not displayed on a predetermined page of a plurality of pages generated by the pagination, selecting one of participants whose view is displayed on the predetermined page as a second participant, and displaying the views by swapping a position of the view corresponding to the selected second participant and a position of the view corresponding to the first participant.

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: Audio circuitry, comprising: a speaker driver operable to drive a speaker based on a speaker signal; a current monitoring unit operable to monitor a speaker current flowing through the speaker and generate a monitor signal indicative of that current; and a microphone signal generator operable, when external sound is incident on the speaker, to generate a microphone signal representative of the external sound based on the monitor signal and the speaker signal.

Abstract: A method for driving a voice coil of a loudspeaker may include providing a magnetic circuit having an air gap, providing a voice coil suspended in the air gap, and applying an audio signal to the voice coil to move the voice coil along a travelling axis. The voice coil comprises a center voice coil section, an upper voice coil section, and a lower voice coil section arranged on respective sides of the center voice coil section. A center driving signal is provided to the center voice coil and an upper rectified driving signal, attenuating a first direction of current, and a lower rectified driving signal, attenuating a second direction of current, are provided respectively to the upper and lower voice coil sections. The invention further relates to a voice coil driving system and a loudspeaker comprising a voice coil driving system.

Abstract: An audio signal control circuit includes an impedance calculator, a suppression value setter, a level detector, and a level controller. The impedance calculator is configured to calculate impedance of a speaker from voltage and current of an audio signal to be outputted to the speaker. The suppression value setter is configured to set a suppression value of the audio signal, using the impedance. The level detector is configured to perform level detection using: i) the voltage when the impedance is equal to or more than a switching threshold value, and ii) the current when the impedance is less than the switching threshold value. The level controller is configured to perform level control of the audio signal using: i) a level of a detection signal that has been detected by the level detector, and ii) the suppression value.

Abstract: Different embodiments of methods and apparatus to produce audio output signals are disclosed. In one embodiment, an ultrasonic speaker outputting ultrasonic signals can be transformed into first audio output signals, which are directional. A non-ultrasonic speaker can output second audio output signals. The embodiment can be configured to output the first audio output signals or the second audio output signals in a vehicle. Another embodiment can be configured to output the first and the second audio output signals together. Yet another embodiment can be configured to be personalized to hearing characteristics of a user, or to depend on sound level of an environment of the user. One embodiment can include a directional speaker attached to a vehicle, with its output steerable towards a user in the vehicle.

Abstract: An audio processing system is described including an amplifier configured to receive a first audio signal and output the first audio signal to an acoustic transducer comprising a voice coil. A sensor detects a signal corresponding to voice coil current of the acoustic transducer. A controller compares the first audio signal and the detected signal and determines a second audio signal from the comparison. The second audio signal is representative of an external sound source detected via the acoustic transducer. The audio processing system may simultaneously output the first audio signal and receive the second audio signal using the same acoustic transducer.

Abstract: A micro-speaker is provided, including: a vibration unit and a fixed unit. The vibration unit includes a diaphragm, a voice coil located below the diaphragm and driving the diaphragm to vibrate and emit sound, and a flexible circuit board connected to the voice coil. The diaphragm and the flexible circuit board are fixed to the fixed unit. The voice coil includes a body and a lead wire extending from the body. A pad is formed on the flexible circuit board, and includes a base and a plating layer formed on the base. The plating layer includes a first plating layer and a second plating layer extending from the first plating layer. The first plating layer has a greater thickness than the second plating layer. An end of the lead wire away from the body is welded to the pad and covered by the second plating layer.

Abstract: Audio circuitry, comprising: a speaker driver operable to drive a speaker based on a speaker signal; a current monitoring unit operable to monitor a speaker current flowing through the speaker and generate a monitor signal indicative of that current; and a microphone signal generator operable, when external sound is incident on the speaker, to generate a microphone signal representative of the external sound based on the monitor signal and the speaker signal.

Abstract: A smart speaker is disclosed with an interactive speaker grille. In one embodiment a smart speaker comprises a housing with a speaker grille comprising a plurality of openings. Circuitry coupled to the speaker grille is configured to sense direct user interaction with one or more of a plurality of regions of the speaker grille and to generate corresponding electrical signals indicative of the one or more regions of the speaker grille experiencing direct user interaction. The circuitry can include portions in the path of sound transmission to detect user interaction with regions of the grille and portions outside the path of sound transmission for controlling aspects of the smart speaker (e.g. speaker volume, radio station or media stream selection) based on the particular regions touched.

Abstract: Embodiments discussed herein refer to systems, methods, and circuits for conforming to power up sequencing rules of a conventional hard-wired data connection even though the hard-wired data connection that would ordinarily exist between two data controllers has been replaced with one or more contactless connectors. A consequence of replacing the hard-wired connection with a contactless connector is that the data controllers no longer directly control the power sequencing between the controllers because they are not able to directly communicate with each other over the hard-wired data connections. Power sequence assist circuitry may be used to assists the data controllers in establishing a link in accordance with the power sequencing rules of a particular wired interface despite the intentionally broken hard-wired data connection between the two controllers by instructing the contactless connectors to communicate with their respective data controllers in compliance with the power sequencing rules.

Abstract: An audio system is described that includes one or more speaker arrays that emit sound corresponding to one or more pieces of sound program content into associated zones within a listening area. Using parameters of the audio system (e.g., locations of the speaker arrays and the audio sources), the zones, the users, the pieces of sound program content, and the listening area, one or more beam pattern attributes may be generated. The beam pattern attributes define a set of beams that are used to generate audio beams for channels of sound program content to be played in each zone. The beam pattern attributes may be updated as changes are detected within the listening environment. By adapting to these changing conditions, the audio system is capable of reproducing sound that accurately represents each piece of sound program content in various zones.

Abstract: A speaker system with a thermoelectric conversion device includes a basin frame and a vibration system and a magnetic circuit system that are accommodated in the basin frame. The vibration system includes a diaphragm and a voice coil. The magnetic circuit system includes a T-iron, a magnet and a washer, with a magnetic gap between the washer and the magnet and the T-iron. The voice coil moves up and down in the magnetic gap. A thermoelectric conversion device is connected to the speaker including a thermoelectric power generation module, a boost circuit module, and a load management module. The thermoelectric power generation module is fixedly connected to a back surface of the T-iron for thermoelectric power generation. The boost circuit module boosts and regulates a direct current outputted by the thermoelectric power generation module. The load management module performs a power distribution and load management on the boosted new power.

Abstract: In one embodiment, there is described a new transducer, and in particular an improved system and method for producing linear motion for a transducer such as used in voice coils converting from an electrical input to a mechanical linear motion input.

Abstract: The present disclosure provides an acoustic device, including a frame and a vibration system fixed to the frame, where the vibration system includes a first vibrating diaphragm fixed to the frame, a voice coil driving the first vibrating diaphragm to vibrate and produce a sound, a second vibrating diaphragm fixed to an end of the voice coil which is away from the first vibrating diaphragm, and a flexible circuit board, the flexible circuit board includes a first fixing arm and a second fixing arm that are respectively fixed to the frame and the voice coil, an elastic arm connecting the first fixing arm and the second fixing arm, and a pad respectively extending from two ends of the second fixing arm, the pad is located on an inner side of the voice coil. The acoustic device in the present disclosure has better reliability and acoustic performance.

Abstract: The present disclosure provides an acoustic device, including a frame and a vibration system fixed to the frame, where the vibration system includes a first vibrating diaphragm fixed to the frame, a voice coil driving the first vibrating diaphragm to vibrate and produce a sound, and a flexible circuit board, the flexible circuit board is fixed to an end of the voice coil which is away from the first vibrating diaphragm, the flexible circuit board includes a first fixing arm and a second fixing arm respectively fixed to the frame and the voice coil body, an elastic arm connecting the first fixing arm and the second fixing arm, and a pad respectively extending from two ends of the second fixing arm, the pad is at least partially located on an inner side of the voice coil body. The acoustic device in the present disclosure has better acoustic performance.

Abstract: Techniques described herein may involve dynamically adjusting the equalization of multiple speakers in a playback device. An example implementation involves a playback device emitting, via a speaker, a first audio signal. While emitting the first audio signal, the playback device detects, via a microphone, data representing a second audio signal, the second audio signal comprising one or more reflections of the first audio signal as emitted by the speaker within a surrounding environment. The playback device determines a frequency response curve based on the second audio signal, the frequency response curve representing acoustic characteristics of a system comprising the playback device and the surrounding environment. The playback device determines filter coefficients based on a difference between the determined frequency response curve and a target frequency response curve, and applies the filter coefficients to one or more filters during playback of audio content by the playback device.

Abstract: A networked speaker system automatically adjusts certain audio speaker system settings based on characteristics of the surface on which the speaker is disposed as measured during an initial frequency sweep of test tones emitted from a speaker.

Abstract: In accordance with methods and systems of the present disclosure, a mobile device may include an enclosure adapted such that the enclosure is readily transported by a user of the mobile device, a speaker associated with the enclosure for generating sound, and a controller within the enclosure, communicatively coupled to the speaker. The controller may be configured to receive a signal from the speaker, the signal induced at least in part by sound incident on the speaker other than sound generated by the speaker and process the signal.

Abstract: A coil assembly is coupled to a diaphragm. The coil assembly has a number of coils that are fixed in a stacked, end to end manner along a length axis. The coils include a middle coil, a several upper coils and several lower coils. Each coil has a respective pair of coil terminals so that it can be independently driven by an audio signal. The coil assembly as a whole is overhung, while each of constituent coils is underhung so that there are at least two adjacent coils that are completely within the magnetic gap, and at least two other coils that are completely outside the magnetic gap, during a majority of the full excursion of the coil assembly. Other embodiments are also described and claimed.

Abstract: A computationally implemented system and method that is designed to, but is not limited to: electronically modulating two or more acoustic ultrasonic signals according to output information to be transmitted as two or more acoustic ultrasonic signals from two or more portable electronic device emitters of a portable electronic device; and electronically projecting said two or more acoustic ultrasonic signals from said portable electronic device emitters to produce a first set of one or more acoustic audio signals from a first set of said two or more acoustic ultrasonic signals at a first location and to produce a second set of one or more second acoustic audio signals from of a second set of said two or more acoustic ultrasonic signals at a second location. In addition to the foregoing, other method aspects are described in the claims, drawings, and text forming a part of the present disclosure.

Abstract: Techniques described herein may involve dynamically adjusting the equalization of multiple speakers in a playback device. An example implementation involves a playback device emitting, via a first speaker, a first audio signal and emitting, via a second speaker, a second audio signal. The playback device may detect, via a microphone, an audio signal representing (i) at least a portion of the first audio signal and (ii) at least a portion of the second audio signal. The implementation may further involve the playback device determining one or more reflection characteristics based on the detected audio signal. The example implementation may also involve identifying a first audio setting and a second audio setting based on one or more reflection characteristics and applying (i) the first audio setting to playback of media content via the first speaker and (ii) the second audio setting to playback of media content via the second speaker.

Abstract: An apparatus including a first audio filter; a first transducer connected to the first audio filter; and a first sound attenuator located relative to the first transducer to attenuate sound from the first transducer. The first audio filter includes a first transition frequency band. The first sound attenuator is configured to attenuate sound generated by the first transducer from audio signals through the first audio filter in a target frequency band, where a majority of the target frequency band is in the first transition frequency band.

Abstract: A case for a portable listening device has a housing and a lid. The lid is attached to the housing with a pivotable joint and operates between an open and a closed position with an over-center mechanism that employs a plurality of magnetic elements.

Abstract: An apparatus including a first audio filter; a first transducer connected to the first audio filter; and a first sound attenuator located relative to the first transducer to attenuate sound from the first transducer. The first audio filter includes a first transition frequency band. The first sound attenuator is configured to attenuate sound generated by the first transducer from audio signals through the first audio filter in a target frequency band, where a majority of the target frequency band is in the first transition frequency band.

Abstract: Techniques described herein may involve dynamically adjusting the equalization of multiple speakers in a playback device. An example implementation involves a playback device emitting, via a first speaker, a first audio signal and emitting, via a second speaker, a second audio signal. The playback device may detect, via a microphone, an audio signal representing (i) at least a portion of the first audio signal and (ii) at least a portion of the second audio signal. The implementation may further involve the playback device determining one or more reflection characteristics based on the detected audio signal. The example implementation may also involve identifying a first audio setting and a second audio setting based on one or more reflection characteristics and applying (i) the first audio setting to playback of media content via the first speaker and (ii) the second audio setting to playback of media content via the second speaker.

Abstract: An energy harvester comprising a mass that is subjectable to environmental forces for bringing it into the status of a moving mass, and means linked to the mass for converting and storing of energy embodied in the moving mass, which means are arranged for subsequent release of said energy, wherein the mass is part of a compliant system comprising a frame and first and second elastic beams connecting the mass to the frame, wherein the first and second elastic beams are provided with opposite stiffnesses so as to arrange that in a predefined range of excursions of the moving mass, said mass experiences a preselected stiffness.

Abstract: A digital/analog conversion apparatus to convert a digital signal into an analog signal. The digital/analog conversion apparatus can generate a high-quality analog signal, even when elements configuring the digital/analog conversion apparatus have variance, with high resolution and a small circuit size. The data conversion apparatus is provided with a first data converter to reduce the number of bits of an input signal, a second data converter to convert the format of the first output signal, and a third data converter for conversion into a code which corresponds to the history of the output from the second data converter.

Abstract: A planar dynamic sound transducer comprising a planar diaphragm having at least one electrical conductor, and a planar magnet arrangement having a first portion, a second portion, and an edge region. The second portion surrounds the first portion and extends between the first portion and the edge region of the magnet arrangement. The first portion contains a first plurality of openings so that the first portion has a first degree of opening. The second portion contains a second plurality of openings so that the second portion has a second degree of opening. The first degree of opening is greater than the second degree of opening.

Abstract: In accordance with methods and systems of the present disclosure, a mobile device may include an enclosure adapted such that the enclosure is readily transported by a user of the mobile device, a speaker associated with the enclosure for generating sound, and a controller within the enclosure, communicatively coupled to the speaker. The controller may be configured to receive a signal from the speaker, the signal induced at least in part by sound incident on the speaker other than sound generated by the speaker and process the signal.

Abstract: An audio system that includes an ultrasound sensor array which has a plurality of ultrasound sensor elements, and an audio band array which has a plurality of audio band elements. An estimator is configured to generate a presence characteristic of a user in response to ultrasound signals received from the ultrasound sensor array. The presence characteristic may include a position estimate for the user. An audio array circuit is configured to generate a directional response for the audio band array by applying weights to individual audio band signals for the audio band elements. A weight circuit is configured to determine the weights in response to the presence characteristic.

Abstract: Embodiments described herein may involve dynamically adjusting the equalization of a playback device based on the environment in which the playback device is operating. An example embodiment may involve detecting, by at least one microphone, an audio signal. The example embodiment may also involve selecting a playback device environment from among two or more playback device environments based on the detected audio signal. The example embodiment may further involve identifying an audio setting corresponding to the selected playback device environment; and applying the audio setting when playing media content.

Abstract: A digital sound system suitable for a digital speaker device to directly convert analog sound by a circuit using a ?? modulator and a mismatch shaping filter circuit to output a plurality of digital signals and a plurality of speakers driven by the plurality of digital signals. A digital speaker driving device includes a ?? modulator, a post filter, s driving circuits, and a power supply circuit to supply power to the ?? modulator, the post filter and the s driving elements, and the s driving circuits are adapted to s digital signal terminals.

Abstract: A magnetic field transmitter, especially a transmitter used in conjunction with wireless communications earplugs. In one embodiment, a plate of magnetic material is used behind a coil of electrical conductor to improve the efficiency of the transmitter and to provide electrical and magnetic shielding. The specific dimensions and characteristics of the preferred embodiment of the transmitter described herein provide for efficient wireless communications.

Abstract: A speaker with a built-in filter used for a digital amplifier is provided. The speaker with the built-in filter includes an inductor wound on an outer circumferential surface of a pillar passing through a magnet. The speaker in accordance with the present invention may be directly connected to the digital amplifier without an additional low pass filter interposed therebetween, enabling a smaller and lighter digital amplifier.

Abstract: A micro-speaker. The micro-speaker includes a first plate, a second plate, and a diaphragm. The first plate is biased to a first voltage. The second plate is biased to a second voltage. The diaphragm is positioned between the first plate and the second plate and is configured to receive a digital signal. The digital signal causes the diaphragm to cycle between fully displaced toward the first plate and fully displaced toward the second plate, creating air pressure pulses that mimic the digital signal.

Abstract: An audio conference device receives and emits sounds to perform transmission/reception of audio signals via communications. The device has a speaker array with a plurality of speakers arranged on the lower surface of an elongated main housing, and a microphone array with a plurality of microphones arranged on the side surface of the main housing along the longitudinal direction. Legs are attached to the main body to support the main housing at a prescribed height above the resting surface and to secure good sound emission characteristics of the speaker array. The device further controls directivity of the microphones.

Abstract: A backup alarm for producing an audible warning signal which warbles or beeps, at selected audible output power (Db) levels includes a computer which drives a speaker by switching drive voltage to the speaker with above audible, high frequency pulses in packets repetitive at audible frequency. The high frequency pulses are pulse width modulated at different ratios selected from tables in memory of the computer in accordance with the voltage from a battery power source which provides the drive voltage so that the audible output power remains constant at the selected level over a wide range of power source voltage. By providing for warning/alarm signal generation by means of an operating system which provides both high, above audible frequency and audible frequency switching, power conservation and warning signal output power control are accomplished without interference.

Abstract: A method and apparatus is taught for a signal processing breakthrough that significantly alleviates the “Curse of Dimensionality” (COD) in the characterization of nonlinear physical systems; namely, the reduction in the number of coefficients used to describe the higher order (i.e., nonlinear) kernels in the Volterra series expansion. The latter technique provides the means to evaluate simultaneously from a wide band excitation, all the inter-modulation products up to a specified order by greatly reducing the number of coefficients in the higher order kernel estimation to a manageable set that can be easily manipulated by current personal computers used to enhance a finite element (FE) model that generates a bio-inspired acoustic transducer model.

Abstract: A portable electronic device includes a housing. An opening is formed on the housing and a containing space is formed inside the housing. The portable electronic device further includes a speaker installed inside the containing space in a rotatable manner, a first magnetic component installed on a side of the speaker, a second magnetic component installed inside the housing and disposed on a side of the containing space for attracting the first magnetic component so as to position the first magnetic component on a first location, and a restoring component connected to the speaker for driving the speaker to rotate to a second location so as to expose the speaker outside the opening on the housing when magnetic attractive force between the first magnetic component and the second magnetic component disappears.

Abstract: A contactless, electromagnetic (EM) replacement for cabled Standards-based interfaces (such as USB, I2S) which handles data transfer requirements associated with the Standard, and capable of measuring and replicating relevant physical conditions on data lines so as to function compatibly and transparently with the Standard. A contactless link between devices having transceivers. A non-conducting housing enclosing the devices. A dielectric coupler facilitating communication between communications chips. Conductive paths or an inductive link providing power between devices. An audio adapter communicates over a contactless link with a source device, and via a physical link with a destination device such as a conventional headset. Power may be provided to the adapter from the source device, and by the adapter to the destination device.

Abstract: Provided are a line-of-sight direction determination device and a line-of-sight direction determination method capable of highly precisely and accurately determining a line-of-sight direction from immediately after start of measurement without indication of an object to be carefully observed and adjustment work done in advance. The line-of-sight direction determination device (100) comprises: a line-symmetric position determination unit (150) for determining that the corneal reflection image of a left eye or a right eye is located at a line-symmetric position with respect to the center line of the pupils of the right and left eyes; and a line-of-sight direction determination unit (170) for determining, from the line-symmetric position determination result, a line-of-sight direction at a specific position including the installation position of an imaging unit (111) or an irradiation unit (112) at the substantially same position as the imaging unit (111).

Abstract: A digital to analog conversion apparatus includes a plurality of gain/phase adjusters configured to receive a digital signal and to output a plurality of adjusted digital input signals, a plurality of digital to analog converters coupled to respective ones of the plurality of gain/phase adjusters and configured to receive the adjusted digital input signals and to generate respective analog signals representative of the adjusted digital input signals, a plurality of phase shift elements coupled to respective ones of the plurality of digital to analog converters and configured to shift the phases of the analog signals generated by the digital to analog converters, and a combiner coupled to the outputs of the plurality of digital to analog converters and configured to combine the respective phase-shifted analog signals to form an analog output signal.

Abstract: A thermal sensor at the output of a switching amplifier senses heat dissipation at the output switch. If an overheating condition is sensed, gain of the digital input signal is lowered to reduce output power of the audio output signal.

Abstract: A digital/analog conversion apparatus for converting a digital signal into an analog signal. The digital/analog conversion apparatus can generate a high-quality analog signal, even when elements configuring the digital/analog conversion apparatus have variance, with high resolution and a small circuit size. The data conversion apparatus is provided with a first data converter for reducing the number of bits of an input signal, a second data converter for converting the format of the first output signal, and a third data converter for conversion into a code which corresponds to the history of the output from the second data converter.

Abstract: A digital audio driver having a floating PWM input and for controlling a stage of high voltage, high speed high- and low-side MOSFETs series connected at a node. The driver includes a floating input interface circuit having a protection circuit to provide secure protection sequence against over-current conditions; and high and low side circuits for driving the high- and low-side MOSFETs, each high and low side circuit including a bi-directional current sensing circuit which requires no external shunt resistors that enables capture of over-current conditions at either positive or negative load current direction. The RDS(ON) of the high- and low-side MOSFETs is used as current sensing resistors, once the RDS(ON) exceeds a pre-determined threshold, an over current output signal is fed to the protection block to shutdown the MOSFET to protect the devices.

Abstract: A semiconductor device is disclosed. The semiconductor device includes a digital audio circuit which converts an input digital signal into an analog audio signal, a DC-DC converter having a switching power source circuit, and an audible frequency determining circuit. In order that a difference between a frequency of a first clock signal for digital to analog conversion which is used in the digital audio circuit and a frequency of a second clock signal for switching control which is used in a DC-DC converter exceeds a maximum audible frequency, a frequency comparing circuit in the audible frequency determining circuit outputs a signal to a frequency changing circuit in the DC-DC converter. The frequency changing circuit causes a second oscillating circuit to change the second frequency.

Abstract: A dual-coil, dual magnetic gap electromagnetic transducer is provided where each voice coil is wired to include separate leads so that each individual voice coil may be driven by a separate amplifier or by a separate bridged amplifier. Signal processing may further be utilized to increase the output of the loudspeaker, to achieve extreme excursion without extreme distortion and to provide for alternative voice coil designs to address common problems with dual-coil, dual magnetic gap transducers, including, but not limited to, heat generation.

Abstract: An power-saving amplifying device is disclosed, the power-saving amplifying device uses a micro controller unit (MCU) to receive a control signal transmitted by a volume controller and to generate a decision signal based on the control signal; the MCU transmits the decision signal to the volume controlling circuit for obtaining a drive signal, then the volume controlling circuit transmits the drive signal to a power amplifier for driving a speaker to output a sound with a required volume; the MCU also calculates an output value of a PWM signal and transmits the PWM signal to a DC integrating circuit for rectifying and integrating the PWM signal into a DC voltage; the DC voltage is coupled with a voltage control terminal of the power supply to increase or decrease the DC voltage outputted by the power supply to the power amplifier, thereby reducing power consumption by using the volume to control the output voltage of the power supply.