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microphone array

A microphone array and microphone technology, which can be applied to the spatial/structural arrangement of microphones, sensor components, microphone ports/microphone accessories, etc., and can solve problems such as high-level noise amplification and limitation of available frequency range.

Active Publication Date: 2018-10-12
HARMAN BECKER AUTOMOTIVE SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The low frequency limit basically arises when the directivity of a particular microphone in the array is weak compared to the wavelength in this frequency range and the necessary high degree of amplification, which leads to a high degree of amplification of (self) noise and thus the need for Limit the available frequency range until the lower limit frequency is reached

Method used

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Embodiment Construction

[0012] figure 1 is a schematic diagram of a common array 1 of microphones (herein referred to as microphone array 1 ) used in a modal beamformer system 2 that also includes a beamforming device unit 3. The microphone patches 4 can be arranged on the surface of the rigid sphere in a regular or semi-regular manner. The modal beamformer 3 may comprise a splitter (also called an eigenbeamformer), a steering unit, a compensation unit and a summation unit. Each microphone patch 4 in the microphone array 1 produces an audio signal, which is transmitted to the modal beamformer unit 3 via some suitable (eg wired or wireless) connection.

[0013] For example, the microphone array 1 may comprise 32 microphone patches 4 mounted in optional pockets 5 arranged on the surface of an acoustically rigid sphere 6 acting as a diffractive structure in a "truncated icosahedron" pattern place. There are only five possibilities for dividing the surface of a sphere into equal regions. These five ...

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Abstract

The present invention relates to a spherical microphone array comprising: a sound diffractive structure having at least one closed three-dimensional shape of an irregular, regular or semi-regular convex polyhedron having regular or non-regular a congruent surface of a regular polygon; and at least two omnidirectional microphones, the microphones are arranged in or on the sound diffraction structure along an elliptical line, the center of the elliptical line is arranged on all sides facing the regular polygon The centerline of the center of one of the faces.

Description

technical field [0001] The present disclosure relates to microphone arrays, and more particularly to spherical microphone arrays for use in modal beamforming systems. Background technique [0002] Microphone array-based modal beamforming systems typically include: a spherical microphone array of multiple microphones uniformly distributed over the surface of a stereosphere or virtual sphere for converting sound into electrical audio signals; The signals are combined to form a modal beamformer representing an auditory scene of at least a portion of the acoustic sound field. This combination allows acoustic signals to be picked up depending on their direction of propagation. Consequently, microphone arrays are also sometimes referred to as spatial filters. Spherical microphone arrays exhibit low and high frequency limits such that the sound field can be accurately described only in a limited frequency range. The low frequency limit basically arises when the directivity of a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R1/08H04R3/00
CPCH04R1/406H04R5/027H04R2201/401H04S2400/15H04R3/005
Inventor M.克里斯托夫
Owner HARMAN BECKER AUTOMOTIVE SYST