Abstract: A microphone array includes one or more front-facing microphones disposed on a front surface of the collaboration endpoint and a plurality of secondary microphones disposed on a second surface of the collaboration endpoint. The sound signals received at each of the one or more front-facing microphones and the plurality of secondary microphones are converted into microphone signals. When the sound signals have a frequency below a threshold frequency, an output signal is generated from microphone signals generated by the one or more front-facing microphones and the plurality of secondary microphones. When the sound signals have a frequency at or above a threshold frequency, an output signal is generated from microphone signals generated by only the one or more front-facing microphones.

Abstract: A processor of a filter generation device according to this embodiment includes a first synchronous addition unit that generates a first synchronous addition signal, a second synchronous addition unit that performs synchronous addition of sound pickup signals acquired with a microphone worn on an object or a person other than a listener with a second number of synchronous additions larger than a first number of synchronous additions and thereby generates a second synchronous addition signal, a first transform unit that transforms the first and second synchronous addition signals into frequency domain data so as to acquire first and second spectrums corresponding to the first and second synchronous addition signals, a first correction unit that corrects data of a first spectrum in a correction band and thereby generates a third spectrum, and a first inverse transform unit that inversely transforms the third spectrum into time domain data.

Abstract: A low power, digital audio interface includes support for variable length coding depending on content of the audio data sent from the interface. A particularized coding system is implemented that uses techniques of silence detection, dynamic scaling, and periodic encoding to reduce sent data to a minimum. Other techniques include variable packet scaling based on an audio sample rate. Differential signaling techniques are also used. The digital audio interface may be used in a headphone interface to drive digital headphones. A detector in the interface may detect whether digital or analog headphones are coupled to a headphone jack and drive the headphone jack accordingly.

Abstract: An audio amplifier has a first H bridge and a second H bridge, to drive a speaker as a load. The second H bridge drives the speaker through resistors for increased output impedance. Control logic operates the first H bridge as a class D amplifier for larger amplitudes of audio signal, and operates the second H bridge as a class D amplifier for smaller amplitudes of audio signal. Other aspects are also described and claimed.

Abstract: An example implementation may involve a control device displaying a prompt to initiate a calibration sequence that involves calibration of a playback device for a given environment in which the playback device is located. The example implementation may also involve the control device displaying (i) a prompt to prepare a playback device for calibration within a given environment, (ii) a prompt to prepare the given environment for calibration of the playback device, and/or (iii) a prompt to prepare the control device for calibration of the playback device. The example implementation may also involve a control device displaying a selectable control, that, when selected, initiates calibration of the playback device. The example implementation may further involve a control device initiating calibration of the playback device.

Abstract: Embodiments described herein relate to methods and apparatus for limiting the excursion of a transducer. The method comprises receiving a transducer signal; and limiting the transducer signal or a signal derived therefrom to generate a limited transducer signal for input into the transducer such that an electrical response caused by the limited transducer signal in an electrical model of the transducer would be less than a threshold electrical response, wherein the threshold electrical response has been determined by: inputting a stimulus input signal into the electrical model of the transducer, wherein the stimulus input signal is designed to cause the transducer to reach a maximum excursion; and determining the threshold electrical response as a maximum of the electrical response caused by the stimulus input signal in the electrical model of the transducer.

Abstract: A system and method for providing user location-based multi-zone media. As a non-limiting example, various aspects of this disclosure provide a system and method that flexibly presents media content (e.g., audio content) to a user as the user moves throughout a premises. As a non-limiting example, various aspects of this disclosure provide a system and method that flexibly presents media content (e.g., audio content) to a user as the user moves throughout a premises.

Abstract: Various embodiments relate to data packet compensation in multi-device media systems. A primary headphone device may include one or more communication interfaces configured to communicate with an audio source and a secondary headphone device. The primary headphone device may further include communication logic configured to transmit information to the secondary headphone device identifying one or more data packets received by the primary headphone device. The communication logic may also be configured to receive reporting information identifying one or more data packets missed by the secondary headphone device. Also, the communication logic may be configured to transmit compensation information for the one or more data packets missed by the secondary headphone device.

Abstract: A method is presented for estimating and suppressing reverberation from a digital reverberant signal. A method for changing a first reverberation estimation according to another reverberation estimation is further provided. A method for controlling the reverberation suppression rate is also presented.

Abstract: A device unlocking method utilizing ultrasound imaging. A device detects a cavity structure of a user using ultrasound imaging and utilizes a cavity model of the cavity structure for biometrics authentication. The cavity model of the user be stored in a mass storage and forms a basis for similarity comparison with other ultrasound detected cavity structures. The device allows device unlocking when a subsequently detect cavity structure matches the cavity model.

Abstract: A method for performing DRC on a HOA signal comprises transforming the HOA signal to the spatial domain, analyzing the transformed HOA signal, and obtaining, from results of said analyzing, gain factors that are usable for dynamic compression. The gain factors can be transmitted together with the HOA signal. When applying the DRC, the HOA signal is transformed to the spatial domain, the gain factors are extracted and multiplied with the transformed HOA signal in the spatial domain, wherein a gain compensated transformed HOA signal is obtained. The gain compensated transformed HOA signal is transformed back into the HOA domain, wherein a gain compensated HOA signal is obtained. The DRC may be applied in the QMF-filter bank domain.

Abstract: A vehicle is provided. The vehicle includes a speaker configured to output virtual sound to an outside of the vehicle and convert noise generated from the outside into energy and a battery configured to store the energy converted by the speaker.

Abstract: Disclosed is an earphone recognition method and circuit, an earphone connection method and circuit. When detecting an earphone is plugged, a circuit state between a sound channel area of the earphone and an adjacent area is detected; for a short-circuit state, it is determined the adjacent area is a GND area and another adjacent area of the GND area is an MIC area, and a first indication signal is output to connect the GND area and MIC area of the earphone with a GND end and MIC end of a system respectively; and for an open-circuit state, it is determined the adjacent area is the MIC area and another adjacent area of the MIC area is the GND area, and a second indication signal is output to connect the GND area and MIC area of the earphone with the GND end and MIC end of the system respectively.

Abstract: A method of presenting an audio signal to a user of a mixed reality environment is disclosed. According to examples of the method, an audio event associated with the mixed reality environment is detected. The audio event is associated with a first audio signal. A location of the user with respect to the mixed reality environment is determined. An acoustic region associated with the location of the user is identified. A first acoustic parameter associated with the first acoustic region is determined. A transfer function is determined using the first acoustic parameter. The transfer function is applied to the first audio signal to produce a second audio signal, which is then presented to the user.

Abstract: Disclosed is an audio signal processing device including a processor for outputting an output audio signal generated based on an input audio signal. The processor may be configured to obtain a first pair of head-related transfer function (HRTF)s including a first ipsilateral HRTF and a first contralateral HRTF based on a position of a virtual sound source corresponding to the input audio signal, from a first set of transfer functions including HRTFs corresponding to each specific position with respect to listener, and generate the output audio signal by performing binaural rendering the input audio signal based on the first pair of HRTFs.

Abstract: The systems and methods described herein can be configured to identify, manipulate, and render different audio source components from encoded 3D audio mixes, such as can include content mixed for azimuth, elevation, and/or depth relative to a listener. The systems and methods can be configured to decouple depth encoding and decoding to permit spatial performance to be tailored to a particular playback environment or platform. In an example, the systems and methods improve rendering in applications that involve listener tracking, including tracking over six degrees of freedom (e.g., yaw, pitch, roll orientation, and x, y, z position).

Abstract: A method or apparatus switches between binaural sound and stereo sound in response to head movements of a listener. An electronic device provides the listener with binaural sound at a sound localization point (SLP) in a field-of-view of the listener. Binaural sound at the SLP switches to one of mono or stereo sound when head movements of the listener cause the SLP to move outside the field-of-view.

Abstract: An audio playing apparatus and an audio transmission circuit are provided. The audio playing apparatus includes a first audio connector, a second audio connector, a player, and an audio transmission circuit. The second audio connector has a different interface specification than an interface specification of the first audio connector. The audio transmission circuit is coupled to the first audio connector, the second audio connector and the player. The audio transmission circuit detects a power pin of the first audio connector and a power pin of the second audio connector to obtain a determination result, and selects one of the first audio connector and the second audio connector as a target connector according to the determination result, so as to transmit an audio signal associated with the target connector to the player.

Abstract: At least an embodiment discloses an earphone comprising a shell, a signal generator and a first speaker, wherein the signal generator is electrically connected to the first speaker and both the signal generator and the first speaker are within the shell; a first earphone tube including a first end and a second end, wherein the first end of the first earphone tubes is connected to the shell, and the first end of the earphone tube is approximate to the first speaker; and a first earplug connected to the shell via the first earphone tube, wherein a sound generated by the first speaker is transmitted to the first earplug through the first earphone tube.

Abstract: A personal assistant device may include a microphone configured to receive an audio command from a user and a processor. The processor may be configured to receive a microphone output signal from the microphone based on the received audio command, receive at least one other microphone output signal from another personal assistant device, and autocorrelate the microphone output signals. The processor may also be configured to determine a reverberation of each of the microphone output signals, determine whether the microphone output signal from the microphone has a lower reverberation than the at least one other microphone output signal, and transmit the microphone output signal to at least one other processor for processing of the audio command in response to the microphone output signal having a lower reverberation than the at least one other microphone output signal.