METHOD AND DEVICE FOR ELIMINATING NOISE, AND VOICE RECOGNIZING DEVICE USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a noise eliminating method for efficiently eliminating noise having a transmission characteristic and to provide a noise eliminating device and a voice recognizing device using the noise eliminating device. SOLUTION: Transmission distortion included in an input signal can be eliminated with a logarithmic spectrum including the transmission distortion and averaged for a long time by comprising the steps of: calculating the spectrum of a first input signal (S302); calculating a logarithmic spectrum by performing logarithmic conversion of a spectrum (S303); calculating an average logarithmic spectrum being an average value about a particular section of the logarithmic spectrum (S304); calculating an average spectrum by performing exponential conversion of the average logarithmic spectrum (S305); and calculating a normalized spectrum by dividing the spectrum of a second input signal by the average spectrum (S310 and S311). COPYRIGHT: (C)2003,JPO