[특허]Noise-reduction method for noise-affected voice channels

Noise-reduction method for noise-affected voice channels 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04R-003/00
출원번호	US-0208747 (1994-03-11)
우선권정보	DE-4243831 (1992-12-23); DE-4307688 (1993-03-11)
발명자 / 주소	Linhard Klaus (Neu-Ulm DEX)
출원인 / 주소	Daimler-Benz AG (Stuttgart DEX 03)
인용정보	피인용 횟수 : 142 인용 특허 : 0

초록 ▼

A method that can be used not only for elimination of noise, for example in automatic speech recognition, but also to improve the voice quality for people, for instance during use of the speaker function of a car phone. The noise reduction is executed with two or multiple channels in such a manner that the temporal and architectural acoustical signal properties of speech and interference are utilized step-by-step and systematically. According to the method a pivotable, acoustic directional lobe is produced for the individual voice channels by respective digital directional filters and a linear phase estimation to correct for a phase difference between the two channels. The noise in the individual voice channels is estimated during speaking pauses, and the temporally stationary noise sources are damped by means of spectral subtraction. The individual voice channels are subsequently added whereby the statistical disturbances of spectral subtraction are averaged. Finally, the composite signal resulting from the addition is subsequently processed with a modified coherence function to damp diffuse noise and echo components.

대표청구항 ▼

A method for reducing the noise in an output signal of a common output voice channel created by combining at least first and second digital voice signals from related noise-affected respective first and second voice channels, said method comprising the steps of: estimating the noise in the individual at least first and second channels during speaking pauses in the respective at least first and second signals, and damping temporally stationary noise sources by spectral subtraction to provide respective adjusted at least first and second signals; producing a pivotable, acoustic directional lobe, which follows movement of a speaker producing the at least first and second voice signals and which damps spatial noise sources, for the respective first and second channels by respective digital directional filtering of the respective said first and second adjusted signals and an adjustment of a phase difference between the respective at least first and second signals, using a linear phase shift estimation, to produce respective further adjusted at least first and second signals; adding the respective said further adjusted at least first and second signals for the respective said voice channels to average statistical disturbances resulting from the spectral subtractions and to provide a composite signal; and subsequently processing the composite signal with a modified coherence function to damp diffuse noise and echo components.

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Noise-reduction method for noise-affected voice channels 원문보기

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