Abstract: An electronic device such as a pair of headphones may be provided with left and right speakers for playing audio to a user. Control circuitry in the electronic device may play audio through the speakers in an unreversed configuration in which left channel audio is played through a first of the speakers that is adjacent to a left ear of the user and right channel audio is played through a second of the speakers that is adjacent to a right ear of the user or a reversed configuration in which these channel assignments are reversed. A grip sensor may be used to distinguish between the user's left hand and the user's right hand. A motion sensor may detect movement as the headphones are placed on the user's head or on someone else's head. Control circuitry may use grip information and motion information to determine left and right channel assignments.

Abstract: The technology described in this document can be embodied in an apparatus that includes an array of multiple microphones, and a passive directional acoustic element disposed between at least two of the multiple microphones. The passive directional acoustic element includes a pipe having an elongated opening along at least a portion of the length of the pipe, and an acoustically resistive material covering at least a portion of the elongated opening. One or more structural characteristics of the passive acoustic element is configured for capturing a target frequency range in accordance with a target beam pattern associated with the array.

Abstract: In general, the subject matter described in this disclosure can be embodied in methods, systems, and computer-readable devices. An audio processing device plays a source audio signal with an electroacoustic transducer of a user earpiece, and records an aural signal that is sensed by same said electroacoustic transducer. The audio processing device determines values of one or more features of the aural signal that indicate a characteristic of a space in which the user earpiece is located. The audio processing device compares the determined values of the one or more features of the aural signal with pre-defined values of the one or more features. Based on a result of the comparing, the audio processing device determines whether the user earpiece is located at a user's ear.

Abstract: A portable speaker assembly includes a first shell that may insertably receive an electronic device. The first shell is comprised of a rigid material to protect the electronic device from impact damage. A second shell is slidably coupled to the first shell such that each of the first shell and the second shell form a case. The second shell insertably receives the electronic device. The second shell is comprised of a rigid material to protect the electronic device from impact damage. An audio unit is coupled to the case to emit audible sounds outwardly from the case. The audio unit is in wireless electrical communication with the electronic device thereby facilitating the audio unit to receive an audio signal from the electronic device.

Abstract: In accordance with embodiments of the present disclosure, a system may include a digital correcting network for correcting for an intrinsic highpass filter of a microelectromechanical systems (MEMS) microphone such that a combined phase and magnitude response of a cascade of the intrinsic highpass filter and the digital correcting network substantially approximates the response of a target highpass filter.

Abstract: A control device is provided which mixes and records two types of audio signals processed under standards different from each other; in particular an audio signal of ASIO standard and an audio signal of WDM standard. An audio interface is connected to a computer, and an audio signal is input to the computer. A mixer module of the computer mixes an audio signal effect-processed by an ASIO application and an audio signal reproduced by a WDM application, outputs the mixed audio signal to the audio interface, and to the WDM application, and records the sound. The mixer module automatically switches between presence/absence of the effect process and between presence/absence of mixing according to a mode which is set in an operation panel.

Abstract: A method for estimating an instantaneous phase of dereverberated acoustic signal, the method comprising the following steps: measurement of an acoustic signal reverberated by propagation in a medium, estimation of a one short-term Fourier transform of the reverberated acoustic signal with a window function, calculation of an instantaneous frequency of dereverberated signal from said short-term Fourier transform and from an influencing factor of the medium, said influencing factor being a function of a reverberation time of said medium, determination of an instantaneous phase of dereverberated signal by integrating the instantaneous frequency of dereverberated signal over time.

Abstract: Embodiments are provided for satellite volume control. An example method includes receiving an input at a playback device to adjust a volume for a plurality of playback devices that are grouped for synchronous playback of audio content, wherein the plurality of playback devices includes the playback device. The method also includes sending a first message over a network from the playback device to a device associated with the plurality of playback devices, the first message including information based on the input, wherein the information is used to adjust the volume of the plurality of playback devices. The method also includes receiving a second message at the playback device over the network, the second message including information for the volume of the playback device, wherein the volume is based on the adjusted volume of the plurality of playback devices.

Abstract: A system and method for detecting donning and doffing of an electronic device includes a capacitive sensor configured to generate a capacitance signal based on a capacitance measured by the sensor. The method also includes generating an average capacitance signal by averaging the capacitance signal over a period of time, and generating an intermediate signal based on a difference between the capacitance signal and the average capacitance signal. The method also includes generating a don or doff signal and setting the average capacitance signal to be equal to the capacitance signal when the don or doff signal is generated. The don signal is generated subsequent to the electronic device changing state from a doffed state to a donned state. The doff signal is generated subsequent to the electronic device changing state from a donned state to a doffed state.

Abstract: A reverberator for reverberating an audio signal includes a feedback delay loop processor for delaying at least two different frequency subband signals representing the audio signal by different loop delays to obtain reverberated frequency subband signals.

Abstract: Methods and systems are disclosed for echo suppression of an input audio signal. A multimedia system and a remote control unit are configured to adaptively and dynamically preform calibration processes for obtaining sets of echo suppression parameters. The sets of echo suppression parameters are used to generate an audio signal from an input audio. When rendered by a speaker, the generated audio signal produces echo-suppressed sound of the input audio signal at one of more locations.

Abstract: A headphone is disclosed that includes a headband and a pair of sound emitting units. The headband is a band-shaped body that is curved in an arch shape. The sound emitting units each have a flat shape and are disposed at both ends of the headband. The sound emitting units each include a piezoelectric actuator of a flat film shape disposed on a flat plane of a sound emission housing of a flat shape. The piezoelectric actuator includes a piezoelectric film made of an organic piezoelectric material such as PLLA, and first and second driving conductors disposed on opposing principal planes of the piezoelectric film.

Abstract: A voice signal processing device connected to a smart device is provided. The voice signal processing device is connected to a smart phone, a tablet computer or the like and includes a voice signal input and output function mounted thereon. The voice signal processing device returns a sound generated by the smart device or a sound generated from the exterior into the smart device as a high-quality sound and is configured to extract a voice signal from a wire coupled to the smart device and the ear receiver and configured to input the extracted voice signal into the input terminal of the microphone of the smart device. A voice signal output from the smart device is configured to be extracted and conveniently input into the smart device and loss and distortion is minimized in the process of extracting and returning the voice signal.

Abstract: A stereo-phonic frequency modulation receiver includes: a frequency modulation demodulation circuit, receiving a reception signal, and generating a demodulated signal according to the reception signal; a frequency-division demultiplexer, generating a sum signal, a difference signal and a pilot amplitude signal according to the demodulated signal; a dual sound channel separation circuit, generating a left-channel output signal and a right-channel output signal according to the sum signal and a weakened difference signal; and a weakening circuit, weakening the difference signal according to the pilot amplitude signal or a signal-to-noise ratio (SNR) to generate the weakened difference signal.

Abstract: A control apparatus comprises a first obtaining unit configured to obtain a result of sound collection performed by a sound collection apparatus that collects a measurement signal as a sound, the measurement signal being output from an output apparatus; a detection unit configured to detect a position of the output apparatus or the sound collection apparatus relative to a measurement-subject person; and a second obtaining unit configured to obtain a head-related transfer function of the measurement-subject person based on the result of sound collection obtained by the first obtaining unit and the position detected by the detection unit.

Abstract: A reverberator based on a room response modal analysis is adapted to produce distortion, pitch and time manipulation effects, as well as gated and iterated reverberation. An example “modal reverberator” is a parallel collection of resonant filters, with resonance frequencies and dampings tuned to the modal frequencies and decay times of the space or object being simulated. In one example, the resonant filters are implemented as cascades of heterodyning, smoothing, and modulation steps, forming a type of analysis/synthesis architecture. By applying memoryless nonlinearities to the modulating sinusoids, distortion effects are produced, including distortion without intermodulation products. By using different frequencies for the heterodyning and associated modulation operations, pitch manipulation effects are generated, including pitch shifting and spectral “inversion.” By resampling the smoothing filter output, the signal time axis is stretched without introducing pitch changes.

Abstract: A switching device is adapted for a true diversity receiver and contains: a control switch defined between two microcontrollers of two antennas and configured to switch RF wireless microphone signals so that the two microcontrollers execute a single-receiving dual true diversity program or a dual-receiving single true diversity program. The RF wireless microphone signals are received by the two antennas and are decoded to sound signals by two digital decoders respectively, and the sound signals are sent to two audio signal processors by a multiplexer which corresponds to the two microcontrollers to switch the sound signals of a single-receiving dual true diversity or a dual-receiving single true diversity. Thereafter, the sound signals are output by a sound signal mixer.

Abstract: An example implementation involves a playback device receiving digital data representing audio content, the digital data encoded in a first format. The playback device causes one or more speaker drivers to playback the audio content. The playback device decodes a portion of the received digital data to convert the portion of the received digital data from the first format to a second format and transmits, via a network interface to a computing device of an identification system, the decoded portion of the received digital data. The playback device receives, from via the network interface from the identification system, metadata corresponding to the audio content, and in response, causes a control device to display a graphical representation of the received metadata, wherein causing the control device to display the graphical representation comprises sending, via the network interface to the control device, the received metadata to the control device.

Abstract: A microphone apparatus includes a microphone including first and second bi-directional microphone units having respective directional axes arranged on two straight lines passing through one point and radially extending with an interval of 120 degrees in a circumferential direction, and an omnidirectional microphone unit arranged in sound collection regions of the first and second bi-directional microphone units, and a signal synthesis unit that synthesizes at least one of respective non-inverted signals and inverted signals of the first and second bi-directional microphone units and an output signal of the omnidirectional microphone unit to generate a plurality of output signals having directional axes in mutually different directions.

Abstract: In an example embodiment, an audio device is provided with one or more processors and a computer-readable tangible medium with instructions stored thereon that, when executed, direct the one or more processors to access a target audio file and access a set of evaluated levels associated with one or more preset frequency bands in the target audio file. The computer-readable tangible medium also has instructions that direct the processor to create a set of comparatively balanced levels by comparatively balancing a set of actual levels associated with the one or more preset frequency bands in the target audio file to at least approximate a set of reference levels associated with the one or more preset frequency bands. The computer-readable tangible medium further has instructions that direct the processor to play the target audio file with the set of comparatively balanced levels.