SPECTRUM NOISE REMOVING DEVICE

Japanese Patent JP3279254

B2

PROBLEM TO BE SOLVED: To provide a spectrum noise removing device realizing stable clipping processing regardless of a characteristic of a noise by enlarging an added white noise when a residual noise is larger from the characteristic of the removed noise, and oppositely reducing it when the residual noise is smaller.
SOLUTION: This device is provided with a spectrum conversion part 11 converting an input voice to a spectrum in frame, a noise spectrum estimation part 12 estimating a noise spectrum to be subtracted from the output spectrum of the spectrum conversion part 11, a subtraction part 13 subtracting/outputting the spectrum estimated by the noise spectrum estimation part 12 from the output spectrum of the spectrum conversion part 11, a residual noise estimation part 14 estimating the residual noise from the spectrum of the subtraction part 13 and a white noise addition part 15 adding the white noise according to the amount of the residual noise estimated by the residual noise estimation part 14 to the spectrum outputted from the subtraction part 13.

JP2534241	[Title of Invention] Pattern Comparison Method
WO/2014/064324	MULTI-DEVICE SPEECH RECOGNITION
JPH11119792	EQUIPMENT CONTROLLER WITH VOICE RECOGNIZING FUNCTION, AND VOICE RECOGNIZING DEVICE

Keizaburo Takagi

JP17318398A

April 30, 2002

June 19, 1998

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NEC

G10L15/20; G10L13/00; G10L21/0208; G10L21/0232; G10L25/78; H04B3/20; (IPC1-7): G10L21/02; G10L13/00; G10L15/20; H04B3/20

JP5158494A
JP10254499A
JP8221092A
JP103297A
JP7334189A
JP5165495A
JP9171397A

Asamichi Kato

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