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This invention relates to a method and an apparatus for reducing ambient noise for use with a headset or a boom headset attached to a boom microphone device or the like. The apparatus can include a sensor microphone to detect a background noise signal, a desired input audio transmission, and signal

This invention relates to a method and an apparatus for reducing ambient noise for use with a headset or a boom headset attached to a boom microphone device or the like. The apparatus can include a sensor microphone to detect a background noise signal, a desired input audio transmission, and signal processing means for canceling the noise signals to create an inverted anti-noise signal within an acoustical waveguide located adjacent to the earphone of headset. The method for reducing noise according to this invention is provided by an open loop circuit allowing the input audio signal from an operator or caller to be transmitted to the user's ear without the disturbance of unwanted ambient noise. The method provides adjustments to the gain/or and phase of a noise signal for canceling the noise component detected, within an acoustical waveguide to produce a quiet zone for the desired audio speech to be transmitted.

대표청구항 ▼

[ What is claimed is:] [4.] An open-loop active noise reduction apparatus for reducing ambient noise in the vicinity of a eardrum, comprising:a housing for receiving an input audio signal;an output transducer located in the housing;an input transducer for detecting and reducing ambient noise, the in

[ What is claimed is:] [4.] An open-loop active noise reduction apparatus for reducing ambient noise in the vicinity of a eardrum, comprising:a housing for receiving an input audio signal;an output transducer located in the housing;an input transducer for detecting and reducing ambient noise, the input transducer not located in substantially the same plane as the output transducer;an open-loop signal processing means to reduce the ambient noise detected by the input transducer;an acoustic means including an acoustic waveguide for transmitting the input audio signal to the eardrum without disturbance of the ambient noise andhaving low pass filter characteristics with a zero phase shift over a desired bandwidth to isolate the output transducer from the input transducer for channeling the input audio signal representing substantial speech between the output transducer and the eardrum, wherein a quiet zone is created to isolate sound transmitted from the input transducer.