Beyond NYQUIST: towards the recovery of broad-bandwidth speech from narrow-bandwidth speech

Abstract

SPEECH FROM NARROW-BANDWIDTH SPEECH Carlos Avendano, Hynek Hermansky, 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 A new technique is presented which improves the subjective quality of band-limited speech. The approach is based on a linear model of speech production, in which we independently estimate the spectral envelope and excitation function for a broad-bandwidth speech signal to reconstruct missing frequency components in narrow-bandwidth speech.