Noise Reduction and Recovery of Missing Frequencies in Speech

SPEECH Hynek Hermansky, Carlos Avendano and Eric A. Wan Oregon Graduate Institute of Science & Technology Department of Electrical Engineering and Applied Physics P.O. Box 91000, Portland, OR 97291 ABSTRACT Finite Impulse Response (FIR) Wiener-like lters designed on training data are applied to time trajectories of cubic-root compressed short-term power spectrum of noisy speech recorded over cellular telephone communications. Approximate higher frequencies recovery of the bandlimited clean speech is achieved by a multidimensional ltering of the spectral trajectories. Informal listenings indicate that the technique brings a noticeable improvement to the quality of processed noisy speech while not causing any signi cant degradation to clean speech. Alternative lter structures are also being investigated.