Abstract:
A method of manufacturing an Active Noise Reduction (ANR) device, comprising: providing at a stage during manufacture a pre-completion ANR device (1) in a non-final configuration, the pre-completion ANR device (1) comprising: a plurality of inputs (2); a plurality of signal processing resources (5); an output (3) for driving an earphone driver; and a programmable switch arrangement (4) capable of assigning any of the plurality of inputs (2) to any of the plurality of signal processing resources (5); selecting from the plurality of signal processing resources (5) a subset of signal processing resources to contribute to the output (3), whereby the remaining signal processing resources of the plurality do not contribute to the output in any mode of operation of the ANR device (1); and in a configuration step during manufacture, programming the programmable switch arrangement (4) to assign each of at least a subset of the plurality of inputs (2) to a different one of the selected subset of signal processing resources (5).
Abstract:
An electro-acoustic transducer (100) comprising: a body (110) defining a mounting surface (114) for mounting the electro-acoustic transducer (100) on a substrate and an opening (120) for allowing sound to enter or exit the body (110); a diaphragm (132) mounted in the body (110); and a compression chamber (118) located between the diaphragm (132) and the opening (120); wherein the opening (120) is located on the mounting surface (114).