Patent ID: 8331583

Claim:
A noise reducing apparatus comprising: voice signal inputting means for inputting a voice signal to acquire an input voice signal; noise occurrence period detecting means for detecting a noise occurrence period of the input voice signal; noise removing means for removing a noise occurring for the noise occurrence period from the input voice signal; generation source signal acquiring means for acquiring a generation source signal with a time duration determined to correspond to a time duration corresponding to the noise occurrence period from a use voice signal being used to generate an interpolation signal; pitch calculating means for calculating a pitch of an input voice signal interval near the noise occurrence period in the input voice signal input by the voice signal inputting means; interval signal setting means for setting interval signals divided in each unit period interval set on the basis of the pitch calculated by the pitch calculating means from the generation source signal; interpolation signal generating means for generating an interpolation signal with the time duration corresponding to the noise occurrence period on the basis of arrangement of unit interpolation signal parts, which are formed by connecting the interval signals of the same unit period interval, on a time axis and for alternately arranging the interval signal in a forward time direction and the interval signal in a backward time direction at least in the unit interpolation signal part; and combining means for combining and outputting the interpolation signal and the input voice signal, from which the noise is removed by the noise removing means.