초록 ▼

An apparatus for reducing noise characterized by a number of input microphones arranged near an undesired noise source, a signal processor coupled to the input microphones and operative to develop a number of output signals from the input signals, and a number of speakers coupled to the output signa

An apparatus for reducing noise characterized by a number of input microphones arranged near an undesired noise source, a signal processor coupled to the input microphones and operative to develop a number of output signals from the input signals, and a number of speakers coupled to the output signals of the signal processor to produce anti-noise within a designated quiet zone. Each of the speakers derives a portion of its signal from each of the input microphones so that each output transducer has the maximum amount of information concerning the noise to be canceled. The method of the invention is characterized by the steps of detecting compression waves at a number of detection locations within a medium, and developing a number of complementary signals utilizing all of the detected compression wave information.

대표청구항 ▼

An apparatus for reducing undesired compression waves in a quiet zone of a medium comprising: a plurality of input transducers sensitive to undesired compression waves outside of a quiet zone of a medium and operative to produce a plurality of input signals in response thereto; means for processing

An apparatus for reducing undesired compression waves in a quiet zone of a medium comprising: a plurality of input transducers sensitive to undesired compression waves outside of a quiet zone of a medium and operative to produce a plurality of input signals in response thereto; means for processing said plurality of input signals to produce a plurality of output signals, wherein each of said output signals is derived from each of said input signals such that said apparatus includes a plurality of channels at least equal to the product of the number of said input signals and the number of said output signals; and a plurality of output transducers responsive to said plurality of output signals and operative to produce complementary compression waves in said medium which combine with said undesired compression waves in said quiet zone.