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.
Bibliographic reference. Avendano, Carlos / Hermansky, Hynek / Wan, Eric A. (1995): "Beyond NYQUIST: towards the recovery of broad-bandwidth speech from narrow-bandwidth speech", In EUROSPEECH-1995, 165-168.