Sonicemotion Ag

Other

Sennheiser Electronic Gmbh & Co Kg

Matthias Rosenthal

Etienne Corteel

Renato Pellegrini

Khoa-Van Nguyen

Nguyen Khoa-Van

Clemens Kuhn

Nguyen Khoavan

A method for optimizing the design and sound field control of a compact loud-speaker array, which includes a plurality of loudspeakers located on a closed loudspeaker surface and the control of the emitted sound field by the loudspeakers within a limited reproduction subspace, having the steps of capturing the sound field using a plurality of microphones and adjusting filter coefficients that modify the alimentation signals of the loudspeakers to minimize the difference between reproduced signals captured by the microphones and target signals describing a target sound field. A conical reproduction surface encloses a reproduction subspace is defined such that the apex of the conical reproduction surface is within the closed loudspeaker surface. Loud-speakers are positioned on a limited loudspeaker surface and the closed loudspeaker surface. The microphones are located on a limited microphone surface defined by the intersection of the inner volume of the conical reproduction subspace and the closed microphone surface.

Method for efficient sound field control of a compact loudspeaker array

A method for 3D sound field reproduction from a first audio input signal using a plurality of loudspeakers distributed over a loudspeaker surface aiming at synthesizing a 3D sound field within a listening area in which none of the loudspeakers are located with the sound field radiating from a virtual source, includes the steps of calculating positioning filters using virtual source description data and loudspeaker description data according to a sound field reproduction technique derived from a surface integral, applying positioning filter coefficients to filter the first audio input signal to form second audio input signals. Loudspeakers are positioned for a sampling of the loudspeaker surface into second loudspeaker surfaces for which the loudspeaker spacing is smaller for loudspeakers located in the horizontal plane than for elevated loudspeakers.

Method for practical implementation of sound field reproduction based on surface integrals in three dimensions

A method for sound field reproduction into a listening area of spatially encoded first audio input signals according to sound field description data using an ensemble of physical loudspeakers. The method includes computing reproduction subspace description data from loudspeaker positioning data describing the subspace in which virtual sources can be reproduced with the physically available setup. Then, second and third audio input signals with associated sound field description data, in which second audio input signals include spatial components of the first audio input signals located within the reproducible subspace and third audio input signals include spatial components of the first audio input signals located outside of the reproducible subspace. A spatial analysis is performed on second audio input signals to extract fourth audio input signals corresponding to localizable sources within the reproducible subspace with associated source positioning data. Components of second audio input signals after spatial analysis are merged with third audio input signals into fifth audio input signals with associated sound field description data for reproduction within the reproducible subspace. Loud-speaker alimentation signals are computed from fourth and fifth audio input signals.

Method and device for enhanced sound field reproduction of spatially encoded audio input signals

The invention relates to a method and device for reproducing sound from a first input audio signal () using a plurality of first loudspeakers () and producing a target binaural impression to a listener () within a listening area (). In order to decrease the sensibility of the reproduction of sound to the environment acoustics and to simplify the adaptation of the reproduced sound to the listener's head orientation and position, it is proposed to first define a plurality of second virtual loudspeakers () positioned outside of the listening area (), then to estimate a transfer function () between each second virtual loudspeaker () and the listener's ears (and), to compute from the estimated transfer functions () transaural filters () that modify the said first input audio signal () to synthesize second audio input signals () and to synthesize input signals () from second audio input signals () for creating a synthesized wave field () by the said first loudspeakers () that appears, within the listening area (), to be emitted by the plurality of second virtual loudspeakers () as a plurality of wave fronts () in order to reproduce the target binaural impression at the ears of the listener (and).

Method and system for producing a binaural impression using loudspeakers

The invention relates to a method and device for generating data about the mutual position of at least three acoustic transducers. The aim of the invention is to make it possible to continuously measure and calculate the mutual position of at least three acoustic transducers, particularly the rotation and the position of a human head wearing headphones within a room without using any additional transmitter element on the head, headphone, or body of the listener, during audio playback. This aim is achieved by connecting the acoustic transducers to a digitally operated system which comprises an output path emitting audio signals to first and second acoustic transducers, an input path receiving audio signals from the third acoustic transducer, an audio signal source that is connected to the output path, an ultrasound generator that is connected to the output path, and an information generator which indicates a position and is connected to the input path.

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Dielsdorf, Switzerland

Matthias Rosenthal