Noise Cancelling Microphone Apparatus
AssigneeKopin Corporation
InventorDashen Fan
Life of this patent
Estimating the term…
Abstract
Example embodiments include a method of reducing noise include forming a main signal and one or more reference signals at a beam-former based on at least two received audio signals, detecting voice activity at a voice activity detector, where the voice activity detector receives the main and reference signals and outputting a desired voice activity signal, adaptively cancelling noise at an adaptive noise canceller, where the adaptive noise canceller receives the main, reference, and desired voice activity signals and outputs an adaptive noise cancellation signal, and reducing noise at a noise reducer receiving the desired voice activity and adaptive noise cancellation signals and outputting a desired speech signal.
Claims40
A method of reducing noise, comprising the steps of:
- a) forming a main signal and one or more reference signals at a beam-former based on at least two received audio signals;
- b) detecting voice activity at a voice activity detector, the voice activity detector receiving the main and reference signals and outputting a desired voice activity signal;
- c) adaptively cancelling noise at an adaptive noise canceller, adaptive noise canceller receiving the main, reference, and desired voice activity signals and outputting an adaptive noise cancellation signal;
- and
- d) reducing noise at a noise reducer receiving the desired voice activity and adaptive noise cancellation signals and outputting a desired speech signal.
A noise cancelling digital signal processor (DSP), comprising:
- a) a beam-former configured to output a main signal and one or more reference signals based on at least two received audio signals;
- b) a voice activity detector configured to receive the main signal and reference signals and output a desired voice activity signal;
- c) an adaptive noise canceller configured to receive the main signal, reference signals and desired voice activity signal and output an adaptive noise cancellation signal;
- and
- d) a noise reducer configured to receive the desired voice activity signal and adaptive noise cancellation signal and output a desired speech signal
A non-transitory computer program product for reducing noise, the computer program product comprising a computer readable medium having computer readable instructions stored thereon which, when loaded and executed by a processor, cause the processor to:
- a) produce a main signal and one or more reference signals based on at least two received audio input signals;
- b) detect voice activity based on the main and reference signals and produce a desired voice activity signal;
- c) adaptively cancel noise based on the main, reference, and desired voice activity signals and produce an adaptive noise cancellation signal;
- and
- d) reduce noise based on the desired voice activity and adaptive noise cancellation signals and output a desired speech signal.
A noise cancelling microphone, comprising:
- a) a bi-directional pressure-gradient microphone element;
- b) an acoustic housing having a first and second diametrically opposed acoustic duct, the acoustic housing enclosing the microphone element and being placed along the inside of a tube.
Dependencies are inferred from the claim text.