A loudspeaker baffle that provides variable sound patterns is described. The baffle may support non-low frequency sound sources and a waveguide to provide varying sound beam patterns. The baffle may include a center mount adapted to receive a plurality of audio outputs and a plurality of low frequency apertures to receive a plurality low frequency output. The waveguide may be formed from a front face of the baffle. The front face may be intermediate the center mount and the low frequency apertures. The front face may include a continuously varying waveguide surface with a first waveguide portion adjacent a first audio output of the plurality of audio outputs providing a first sound pattern and a second waveguide portion adjacent a second audio output of the plurality of audio outputs providing a second sound pattern that is different than the first sound pattern.

One embodiment of the present invention sets forth a technique for generating audio for a speaker system. The technique includes receiving an audio input signal, a first location associated with the audio input signal, a first geometric model of the speaker system, and a second geometric model of one or more surfaces in proximity to the speaker system. The technique also includes generating a plurality of output signals for a plurality of speaker drivers in the speaker system based on the audio input signal, the first location, and the first and second geometric models. The technique further includes transmitting the plurality of output signals to the plurality of speaker drivers, wherein the plurality of speaker drivers emit audio that corresponds to the plurality of output signals, the emitted audio rendering a sound corresponding to the audio input signal at the first location.

A loudspeaker configured to provide asymmetrical beam coverage. A first group of drivers to outputs a first beam pattern. A second group of drivers, which is different from the first group of drivers, is configured to output a second beam pattern. A transmission line is adapted to output signals to the first driver group and the second driver group to provide an asymmetrical beam pattern. The first driver group outputs a beam pattern different than the second driver group. This can improve acoustic coverage, e.g., sound pressure levels, in the acoustic environment. In an example, the transmission line is separated into two distinct parts that feeds the first driver group and the second driver group respectively.

A speaker system that reproduces sound inaudible to users around, without using earphones, headphones, or a large-scale speaker array, is provided. Assuming that N is an integer equal to or larger than one, and that a (2n−1)-th sound signal (n=1, . . . , N) is a sound signal obtained based on a subject to be reproduced, a speaker system that emits sound based on a first sound signal, . . . , and sound based on a (2N−1)-th sound signal such that the sound is heard only in a vicinity, includes an n-th speaker unit pair (n=1, . . . , N) including a speaker unit that emits sound based on the (2n−1)-th sound signal (hereinafter, referred to as the positive speaker unit) and a speaker unit that emits sound based on a 2n-th sound signal that is a sound signal with opposite phase to phase of the (2n−1)-th sound signal (hereinafter, referred to as the negative speaker unit).

An acoustic processing device includes a first signal processing unit that generates a positive signal to be supplied to a positive electrode terminal of a first speaker and a positive electrode terminal of a second speaker, by using input audio signals from a first group of microphones, and a second signal processing unit that generates a negative signal to be supplied to a negative electrode terminal of the first speaker and a negative electrode terminal of the second speaker, by using input audio signals from a second group of microphones.

Embodiments include an audio system comprising a speaker array comprising a plurality of drivers arranged in a first planar configuration; a microphone array comprising a plurality of transducers arranged in a second planar configuration; and a beamformer communicatively coupled to the speaker array and the microphone array, the beamformer configured to: generate an individual speaker output signal for each of the drivers in the speaker array based on one or more input audio signals received from an audio source, and generate a microphone output signal for the microphone array based on one or more microphone signals captured by one or more of the transducers. Embodiments also include a method performed by one or more processors coupled to a microphone array having a plurality of transducers and a speaker array having a plurality of drivers.

A method and a system for achieving a self-adaptive surround sound. The method comprises: recognizing specific positions of a room and a user in the room by using an object recognition technology, capturing focusing images of recognized objects by controlling a camera using a focusing control technology, and recording corresponding focusing parameters (S110); calculating position information of the room relative to the camera and position information of the user relative to the camera according to the images and the parameters (S120); calculating sound beams that can achieve the surround sound at the position of the user in said room according to aforesaid calculated position information of the room and the user (S130); obtaining parameters of a filter group according to the calculated sound beams, and adjusting the filter group of a loudspeaker array according to the parameters (S140); and playing an audio signal via the loudspeaker array after the audio signal is filtered by the filter group that has been adjusted according to the parameters to form surround sound at the position of the user in the room (S150).

An electronic device may use differential microphone arrays for beamforming. The electronic device may include a first microphone for obtaining a first microphone signal and a second microphone for obtaining a second microphone signal. The electronic device may include a processor to process the microphone signals to obtain frequency bins. The processor may apply delay coefficients to the frequency bins of the microphone signals to obtain a delayed signal. The delay coefficients may be based on a phase difference between the microphone signals. The phase difference may be a function of frequency. The processor may be configured to combine the delayed signal with the first microphone signal or the second microphone signal to obtain a beamformed signal. The electronic device may include a memory to store the beamformed signal.

Disclosed herein are example techniques for acoustic position measurement in an example listening environment. One example includes determining a requirement for position information of a speaker-equipped device within a room in which a media playback system is located, and in response to determining the requirement for position information of the speaker-equipped device, determining a position of the speaker-equipped device relative to a microphone-equipped device of the media playback system based at least in part on a test sound emitted from the speaker-equipped device. After determining the position of the speaker-equipped device relative to the microphone-equipped device, some examples further include configuring one or more audio configuration parameters of the media playback system based on the position of the speaker-equipped device relative to the microphone-equipped device.

A speaker system is disclosed for providing customised acoustical wavefronts with vertical and horizontal pattern control and amplitude and phase control. The system including a speaker housing (1) having therein at least a first array (2) of high frequency driver segments (3) and at least a secondary array (4) of low frequency driver segments (5) disposed behind said first array (2), said first array having sufficient space between said driver segments (3) to allow acoustic transparency whereby a wavefront from said secondary array (4) can substantially pass through said first array (2).