Patent ID: 7349547

Claim:
An apparatus capable of providing an output signal in response to sound pressure in the vicinity of a desired acoustic source, the apparatus comprising: a main body located at a given distance from the desired source; a boom, movably coupled to the main body and adapted to be positioned in at least a first position or a second position; a microphone having a diaphragm; an acoustic sensing point, acoustically coupled to the microphone, wherein the acoustic sensing point is disposed at different distances from the desired acoustic source when the boom is in the first position and the second position; and, a controller, coupled to the boom, for changing a ratio of an amplitude of the output signal to an amplitude of sound pressure at the acoustic sensing point in response to the position of the boom; wherein the controller is adapted to maintain a ratio of the amplitude of the output signal to an amplitude of sound pressure in the vicinity of the desired acoustic source independently of the position of the boom without moving the main body relative to the desired source.