Sound Wave Field Generation

Abstract

A system and a method are configured to generate a sound wave field around a listening position in a room in which a loudspeaker array of K ‰¥ 1 groups of loudspeakers, with each group of loudspeakers having at least one loudspeaker, is disposed around a listening position, and a microphone array of M ‰¥ 1 groups of microphones, with each group of microphones having at least one microphone, is disposed at the listening position. The system and a method include equalizing filtering with controllable transfer functions in signal paths upstream of the K groups of loudspeakers and downstream of an input signal path, and controlling with equalization control signals of the controllable transfer functions for equalizing filtering according to an adaptive control algorithm based on error signals from the K groups of microphones and an input signal on the input signal path. At least one of the K groups of loudspeakers is operated at a distance of less than 0.5 meters from the listening position.

Description

technical field [0001] The present disclosure relates to a system and method for generating an acoustic wavefield. Background technique [0002] Spatial sound field reproduction technology utilizes multiple speakers to create a virtual auditory scene over a large listening area. Several sound field reproduction techniques such as Wave Field Synthesis (WFS) or Ambisonics utilize loudspeaker arrays equipped with multiple loudspeakers to provide highly detailed spatial reproduction of sound scenes. In particular, wave field synthesis is used to achieve highly detailed spatial reproduction of acoustic scenes to overcome limitations by using arrays of eg tens to hundreds of loudspeakers. [0003] Spatial sound field reproduction technology overcomes some limitations of stereo sound reproduction technology. However, technical constraints prohibit the use of large numbers of loudspeakers for sound reproduction. Wavefield synthesis (WFS) and ambisonics are two similar types of so...

AI Technical Summary

Problems solved by technology

Therefore, listening rooms should not exhibit considerable wall reflections, as the reflected part of the reflected wavefield will distort the reproduced wavefield

In many situations such as the interior of an automobile, the necessary acoustic treatment to achieve such room characteristics may be too expensive or impractical

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