Patent ID: 6084973
Filing Date: 2000-07-04
Classification: H04R

Abstract:
A directional microphone, comprising:a shotgun microphone having an elongated tube which is designed to control the directivity of said directional microphone at frequencies above a predetermined frequency, said elongated tube causing the portion of an output signal from said shotgun microphone and the directional microphone at frequencies above said predetermined frequency to be generally representative of the portion of the signals at frequencies above said predetermined frequency which originate from a location in front of said directional microphone in a direction along the longitudinal axis of said elongated tube;at least two reference microphones spatially arranged about said shotgun microphone;a low-pass filter electrically connected to said reference microphones, said low-pass filter generating an output signal having a frequency generally below said predetermined frequency; anda signal processor electrically connected to said shotgun and reference microphones and said low-pass filter, said signal processor generating interference canceling signals from the output signal of said low-pass filter, said signal processor combining said canceling signals with the output signal from said shotgun microphone to generate an output signal in which signals originating from the location in front of the directional microphone in a direction along the longitudinal axis of said tube are enhanced and signals originating from locations other than in front of the directional microphone in a direction along the longitudinal axis of said elongated tube are suppressed.