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Source seeking directional microphone appropriate for inclusion in miniature applications

IP.com Disclosure Number: IPCOM000239233D
Publication Date: 2014-Oct-23
Document File: 2 page(s) / 92K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed are a method to use induction as a mechanism for moving a directional microphone and a mechanism to determine the sound source. This source seeking directional microphone is appropriate for inclusion in miniature applications.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 51% of the total text.

Page 01 of 2

Source seeking directional microphone appropriate for inclusion in miniature applications

Directional microphones are especially good at capturing sound, better than an undirected microphone.

Prior art exists which applies a microphone array to better localize sounds, especially by mixing the sounds from various microphone sources and triangulating the source of sounds to digitally isolate sounds and cancel noise. [1] Another

system exists for moving microphones in three dimensions. [2] Sound source detection has also conventionally relied on a microphone array to triangulate the source of sound. [3]

The novel contribution is two-fold: a method to use induction as a mechanism for moving a microphone and a mechanism to determine the sound source. The mechanism is applicable to small or mobile devices, or devices in which moving mechanical parts can cause complications or be easily broken (e.g., inside a phone).

To determine the sound source, the mechanism uses a single directional microphone with an attached magnet. The microphone and magnet are suspended in a chamber, a lubricated sphere or cylinder with a low friction surface or in a sphere or cylinder surrounded at least partially by ball bearings in the dimensions of movement. This may be a vacuum chamber if the microphone surface is in sufficient contact with the container to transmit sound. Around the sphere or

cylinder, an electrical charge is induced in such as a way as to orient the magnet (and hence microphone) in three or two dimensions, respectively. The entire spherical or cylindrical device may only be slightly larger in diameter than the longest dimension of the microphone, and in the case of a (cylindrical) device capable of two-dimensional orientation, only slightly higher than the shortest dimension of the microphone.

Figure: A two-dimension illustration of the mechanism. The illustration can be either extruded relative to the page, producing a flat cylindrical device capability of two-dimensional orientation, or the microphone can exist in a spherical device capable of three-dimensions of orientation. Th...