Abstract: The disclosure relates to an audio signal processing apparatus for modifying a stereo image of a stereo signal. The apparatus includes a panning index modifier configured to apply a mapping function to at least all panning indexes of stereo signal time-frequency segments that are within a frequency bandwidth, a first panning gain determiner configured to determine modified panning gains for time-frequency signal segments of the first and second audio signal based on the modified panning indexes, and a re-panner configured to re-pan the stereo signal according to ratios between the modified panning gains and panning gains of the first and second audio signal that correspond to the modified panning gains in time and frequency.

Abstract: An audio playback system performs a method including identifying a first type of audio included in a first audio stream, tagging the first audio stream with a first digital tag corresponding to the first type of audio, identifying a second type of audio included in a second audio stream, tagging the second audio stream with a second digital tag corresponding to the second type of audio, rendering the first audio stream with a first equalization profile applied thereto, the first equalization profile selected responsive to the audio playback system detecting the first digital tag in the first audio stream, and rendering the second audio stream with a second equalization profile different than the first equalization profile applied thereto, the second equalization profile selected responsive to the audio playback system detecting the second digital tag in the second audio stream.

Abstract: Accurate modeling of acoustic reverberation can be essential to generating and providing a realistic virtual reality or augmented reality experience for a participant. In an example, a reverberation signal for playback using headphones can be provided. The reverberation signal can correspond to a virtual sound source signal originating at a specified location in a local listener environment. Providing the reverberation signal can include, among other things, using information about a reference impulse response from a reference environment and using characteristic information about reverberation decay in a local environment of the participant. Providing the reverberation signal can further include using information about a relationship between a volume of the reference environment and a volume of the local environment of the participant.

Abstract: The positions of a plurality of speakers at a media consumption site are determined. Audio information in an object-based format is received. Gain adjustment value for a sound content portion in the object-based format may be determined based on the position of the sound content portion and the positions of the plurality of speakers. Audio information in a ring-based channel format is received. Gain adjustment value for each ring-based channel in a set of ring-based channels may be determined based on the ring to which the ring-based channel belongs and the positions of the speakers at a media consumption site.

Abstract: An arrangement, for reproducing audio data of an acoustic scene, adapted for generating audio signals for at least a first and a second headphone channel of a headphone assembly, the audio signals corresponding to at least one audio object and/or sound source in the acoustic scene comprising at least one given close range and at least one given distant range arranged around a listener, the arrangement comprising a first headphone channel; a second headphone channel; a basic channel provider comprising at least a basic system adapted for reproducing audio signals corresponding to at least one audio object and/or sound source arranged in at least one distant range; a proximity channel provider comprising at least a proximity system adapted for reproducing audio signals corresponding to at least one audio object and/or sound source arranged in at least one close range.

Abstract: Loudspeakers are described that may reduce comb filtering effects perceived by a listener by either 1) moving transducers closer to a sound reflective surface (e.g., a baseplate, a tabletop or a floor) through vertical (height) or rotational adjustments of the transducers or 2) guiding sound produced by the transducers to be released into the listening area proximate to the reflective surface through the use of horns and openings that are at a prescribed distance from the reflective surface. The reduction of this distance between the reflective surface and the point at which sound emitted by the transducers is released into the listening area may lead to a shorter reflected path that reduces comb filtering effects caused by reflected sounds that are delayed relative to the direct sound. Accordingly, the loudspeakers shown and describe may be placed on reflective surfaces without sever audio coloration caused by reflected sounds.

Abstract: An audio amplifier system is described comprising: a variable gain audio processor for processing digital audio signal, a digital to analog converter coupled to the audio processor, and configured to receive the processed digital audio signal, a variable gain amplifier having an input coupled to the output of the digital to analog converter and operably connected to a power supply, a controller coupled to the variable gain audio processor and the variable gain amplifier and configured to switch the audio amplifier system between a first operating mode having a first power supply voltage value and a second operating mode having a second higher power supply voltage value; wherein the controller is operable in the first operating mode to set the audio amplifier system gain to a desired gain value and in the second operating mode to maintain the desired gain value.

Abstract: A machine tool that can output an abnormal noise is provided. A machine tool includes: an input unit configured to receive an input of a setting for defining an operation mode of the machine tool; a storage unit configured to store sound generated during a normal operation of the machine tool and acquired in advance; a sound collection unit configured to collect sound in the machining area; a sound selection unit configured to extract a part of sound collected in the machining area in accordance with the setting input for outputting sound to the outside of the machine tool; and a sound output unit configured to output sound extracted by the sound selection unit to the outside of the machining area.

Abstract: An ornamental attachment apparatus is provided for attaching to and ornamenting hearing protection devices. The ornamental attachment apparatus includes an ornamental portion having ornamental feature, and a receiving portion for receiving and attaching to a post portion of a hearing protection device. The receiving portion may include a cavity including an attachment element for retaining the post portion therein. In some embodiments, the ornamental attachment apparatus includes an attachment element with a tapered shape for insertion into a recess on a custom hearing protection device. The ornamental portion may include a sensor, a peripheral device and an electronic component for controlling the peripheral device. The electronic component may be configured to control the peripheral device responsive to an electronic signal received from the sensor.

Abstract: The present invention provides a method for automatically adjusting volume of an audio device, including steps of: S1, obtaining user identity information; S2, detecting an actual environmental volume; S3, determining user hearing condition according to the obtained user identity information, and adjusting a volume of the audio device according to corresponding relationship of user hearing condition, environmental volume and target volume of the audio device, so that the volume of the audio device reaches a target volume corresponding to the detected actual environmental volume and the determined user hearing condition. Accordingly, the present invention further provides an audio device for automatically adjusting volume. With the present invention, the volume of the audio device can be automatically adjusted according to environmental volume with respect to different users.

Abstract: The present disclosure discloses an image processing method of a mobile terminal, and a mobile terminal. To process an image, an audio signal is collected using a sensor of the mobile terminal. Air-blowing signal intensity is acquired by performing a windowed fast Fourier transform (FFT) on the audio signal to obtain a frequency domain signal of the audio signal. The frequency domain signal of the audio signal is divided into at least one time-slice frequency domain signal. It is then identified whether the audio signal is an air-blowing signal according to the at least one time-slice frequency domain signal and a preset property of the air-blowing signal. The air-blowing signal intensity is acquired according to the at least one time-slice frequency domain signal when the audio signal is identified as an air-blowing signal. An image is acquired according to the air-blowing signal intensity.

Abstract: A first example playback device includes one or more processors and a non-transitory computer-readable medium storing instructions that, when executed by the one or more processors, cause the first playback device to perform functions. The functions include generating a mixed audio signal comprising one or more components of a first audio stream and one or more components of a second audio stream; and playing the mixed audio signal, where the one or more components of the second audio stream of the mixed audio signal played by the first playback device are played in synchrony with a second playback device configured to play the second audio stream. An example non-transitory computer-readable medium and an example method, both related to the first example playback device, are also disclosed herein.

Abstract: A device includes an encoder and a transmitter. The encoder is configured to determine a mismatch value indicative of an amount of temporal mismatch between a reference channel and a target channel. The encoder is also configured to determine whether to perform a first temporal-shift operation on the target channel at least based on the mismatch value and a coding mode to generate an adjusted target channel. The encoder is further configured to perform a first transform operation on the reference channel to generate a frequency-domain reference channel and perform a second transform operation on the adjusted target channel to generate a frequency-domain adjusted target channel. The encoder is also configured to estimate one or more stereo cues based on the frequency-domain reference channel and the frequency-domain adjusted target channel. The transmitter is configured to transmit the one or more stereo cues to a receiver.

Abstract: The present invention is applicable to the field of audio collection and provides a fixed apparatus and an audio collection device. Multiple groups of simulated ear structures are disposed on the fixed apparatus, and the simulated ear structures have simulated ear canal openings used for placing audio collectors. The audio collectors may placed in simulated ear canal openings of the simulated ear structures of the fixed apparatus, so that collected audio signals have richer sources, higher quality, and higher stereoscopic sensation. The fixed apparatus may be used for audio recording in multiple orientations, so that smoothness, clearness, and comfort during sound field fusion and switching are ensured, more complete and richer sound field information is collected, the best sound field naturalness can be obtained, and a requirement for synchronization between a sound and an image in a VR panoramic video technology is met.

Abstract: The present invention is applicable to the field of audio recording and provides a recording device and a fixed apparatus.

Abstract: The present invention is applicable to the field of audio recording and provides an audio collection apparatus. Multiple fixed apparatuses are stacked and have ear structures and face contours, and audio collectors are disposed at ear canal openings of the ear structures to collect audio information. During audio collection, faces of the fixed apparatuses have different horizontal orientations, so that the audio collectors obtain the audio information at the ear canal openings of the ear structures towards horizontal directions. Therefore, rich sound sources and sound authenticity are ensured, sounds are rich in quality, a stereo field perception effect is achieved, a real sound field relationship can be restored, an in-head effect is avoided, and a requirement for real synchronization between a sound and an image in a virtual reality (VR) panoramic video technology is met.

Abstract: A method for determining the orientation of a loudspeaker relative to a listening device is described. The method simultaneously drives each transducer to emit beam patterns corresponding to distinct orthogonal audio signals. The listening device senses sounds produced by the orthogonal audio signals and analyzes the sensed audio signal to determine the spatial orientation of the loudspeaker relative to the listening device. Other embodiments are also described.

Abstract: A noise-cancelling headphone is provided that avoids an influence of the wind and prevents degradation in the sound quality of the reproduced sound output from a driver unit. The noise-cancelling headphone includes an ear piece including a housing unit having an interior and an exterior, a driver unit attached to the housing unit, and a microphone collecting external sounds at the exterior of the housing unit. The housing unit includes an accommodating portion accommodating the microphone and a sound collecting hole establishing the communication between the accommodating portion and the exterior of the housing unit. The accommodating portion is disposed in an upper portion of the housing unit of the noise-cancelling headphone when worn by the user. The sound collecting hole is open toward the upper side of the housing unit of the noise-cancelling headphone when worn by the user.

Abstract: A low-power sound wave reception method in a computer which includes a microphone, a memory which stores at least one reference pattern, and a computer processor is provided. The low-power sound wave reception method includes: when a sound wave signal having an intensity greater than or equal to a threshold value is detected by the microphone, comparing the sound wave signal and the at least one reference pattern stored in the memory; and when there is a reference pattern matching the sound wave signal, turning on the computer processor, and deactivating the reference pattern matching the sound wave signal (excluding the deactivated reference pattern from the comparing step).

Abstract: A transmitter is provided that is capable of communicating with a management apparatus via a network and is configured to output a plurality of sound waves in a plurality of different directions. The transmitter includes a memory storing a program, and a processor configured to execute the program to implement processes of outputting a first sound wave including first unique information in a first output direction of the plurality of different directions, outputting a second sound wave including second unique information that differs from the first unique information in a second output direction that differs from the first output direction, and individually controlling the first sound wave output by the first sound wave output unit and the second sound wave output by the second sound wave output unit based on a request from the management apparatus.