公开(公告)号：US20240373161A1

公开(公告)日：2024-11-07

申请号：US18556982

申请日：2022-04-20

Applicant: THE SECRETARY OF STATE FOR DEFENCE

Inventor： Gregory Singleton ,  Phillip Henry Glasson

IPC: H04R3/00 ,  H04R1/40 ,  H04R3/12

Abstract: A method and system is provided for processing audio information in a digital signal processor, where the audio information is either received from a microphone array or applied to a loudspeaker array. The digital signal processor applies a double delay-and-subtract beamforming algorithm to two non-collinear pairs of microphone outputs or loudspeaker inputs to provide an array with improved directionality and more uniform signal rejection away from the main beam of the beam formed signal. This can be further improved by tessellating multiple arrays into a macro-array and superimposing their responses.

公开(公告)号：US11863280B2

公开(公告)日：2024-01-02

申请号：US17250859

申请日：2019-09-14

Applicant: THE SECRETARY OF STATE FOR DEFENCE

Inventor： Gregory Singleton ,  Philip Henry Glasson

IPC: H04B7/08 ,  G01N29/22 ,  G01N29/26 ,  G01S7/54 ,  H04B7/06 ,  H04R3/00 ,  H04R29/00

CPC classification number: H04B7/086 ,  G01N29/221 ,  G01N29/262 ,  G01S7/54 ,  H04B7/0617 ,  H04R3/005 ,  G01N2291/106 ,  H04R29/002 ,  H04R29/005 ,  H04R2201/401

Abstract: Techniques for determining the directional frequency response of an arrangement of transducer elements are disclosed. In an example, a method includes providing a simulation of locations of the transducer elements, in the spatial domain; providing a beamforming direction and a frequency range; converting the simulation of locations from the spatial domain into corresponding frequency response values in a spatial frequency domain, such that, for each frequency of a plurality of frequencies in the frequency range, a spatial frequency contour is defined, each of the spatial frequency contours intersecting at the origin; determining the frequency response by applying a transformation to the frequency response values for the provided beamforming direction and frequency range and translating the spatial frequency domain into a modified frequency domain; and outputting the frequency response.