[특허]Noise eliminating apparatus and speech recognition apparatus using the same

Noise eliminating apparatus and speech recognition apparatus using the same 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G10L-005/00 G10L-007/08
출원번호	US-0873976 (1992-04-24)
우선권정보	JP-0101141 (1989-04-19); JP-0261099 (1989-10-05)
발명자 / 주소	Ariyoshi Takashi (Yokohama JPX)
출원인 / 주소	Ricoh Company, Ltd. (Tokyo JPX 03)
인용정보	피인용 횟수 : 65 인용 특허 : 0

초록 ▼

A noise eliminating apparatus includes a first feature extracting block for individually extracting a feature quantity X(f) (f =1, 2, . . . , n) of an input speech containing a noise for n channels (n is an integer), and a second feature extracting block for individually extracting a feature quantity N(f) of the noise for the n channels. The apparatus also includes a noise eliminating block for deriving a first noise eliminating variable k(f) and a second noise eliminating variable d(f) from the feature quantity X(f) of the input speech containing the noise provided for each of the n channels and the feature quantity N(f) of the noise provided for each of the n channels and for generating a feature quantity S(f) of a noise-eliminated input speech in accordance with the following formula: s(f)=X(f)-k(f).N(f)-d(f).

대표청구항 ▼

A noise eliminating apparatus coupled to a recognition device for recognizing an input speech signal, said noise eliminating apparatus comprising: a) first amplifier means for amplifying a first acoustic signal and for generating a first amplified acoustic signal, said first acoustic signal including the input speech signal to be recognized; b) first feature extracting means, coupled to said first amplifier means, for generating a feature quantity of said first amplified acoustic signal for each of n channels, said feature quantity including a power spectrum; c) second amplifier means for amplifying a second acoustic signal and for generating a second amplified acoustic signal; d) second feature extracting means, coupled to said second amplifier means, for generating a feature quantity of said second amplified acoustic signal for each of said n channels, said feature quantity including a power spectrum; e) speech section detecting means, coupled to said first and second feature extracting means, for detecting a speech section of said first acoustic signal for each of said n channels by using the feature quantity of said first amplified acoustic signal and the feature quantity of said second amplified acoustic signal; and f) a noise eliminating unit, coupled to said first and second feature extracting means and said speech section detecting means, said noise eliminating unit including: 1) first means for generating a first noise eliminating variable k(f) and a second noise eliminating variable d(f) on the basis of a feature quantity Xn(f) extracted by said first feature extracting means and a feature quantity Nn(f) extracted by said second feature extracting means when said first acoustic signal does not include the input speech signal and thus said speech section detecting means does not detect the speech section; and 2) second means for generating a feature quantity of said input speech signal which is to be supplied to the recognition device on the basis of a feature quantity Xs(f) extracted by said first feature extracting means and a feature quantity Ns(f) extracted by said second feature quantity extracting means when said first acoustic signal includes the input speech signal and thus said speech section detecting means detects the speech section; wherein said first noise eliminating variable k(f) and said second noise eliminating variable d(f) are defined as a function satisfying the following: (i) the first noise eliminating variable k(f) approaches zero and the second noise eliminating variable d(f) approaches the feature quantity Xn(f) as the feature quantity Xn(f) becomes smaller than a predetermined value; and (ii) the first noise eliminating variable k(f) approaches Xn(f)/Nn(f) and the second noise eliminating variable d(f) approaches zero as the feature quantity Xn(f) becomes greater than the predetermined value.

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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연합인증

Noise eliminating apparatus and speech recognition apparatus using the same 원문보기

초록 ▼

대표청구항 ▼

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Noise eliminating apparatus and speech recognition apparatus using the same 원문보기

초록 ▼

대표청구항 ▼

연구과제 타임라인

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이 특허를 인용한 특허 (65)

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