Noise reduction apparatus using spectral subtraction or scaling and signal attenuation between formant regions

摘要

PCT No. PCT/GB94/00278 Sec. 371 Date Oct. 11, 1995 Sec. 102(e) Date Oct. 11, 1995 PCT Filed Feb. 11, 1994 PCT Pub. No. WO94/18666 PCT Pub. Date Aug. 18, 1994A noise reduction apparatus and method for enhancing noisy speech signal which applies to the spectral component signals of a time-varying input signal either a spectral substraction process or a spectral scaling process followed by signal attenuation in regions of the frequency spectrum lying between identified formant regions.