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BAndwidth Expansion of Narrowband Speech Using Non-Negative Matrix Factorization
Overview This paper presents a novel technique for the estimation of the high frequency components (4-8kHz) of speech signals from narrow-band (0-4 kHz) signals using convolutive Non-Negative Matrix Factorisation (NMF). The proposed technique utilizes a brief recording of simultaneous broad band and narrow band signals from a target speaker to learn a set of broad-band non-negative bases for the speaker. The low-frequency components of these bases are used to determine how the high-frequency components must be combined in order to reconstruct the high-frequency components of new narrow-band signals from the speaker. Experiments reveal that the technique is able to reconstruct broadband speech that is perceptually virtually indistinguishable from true broadband recordings.
| Publisher | Mitsubishi Electric Research Laboratories | File Format | |
|---|---|---|---|
| Date Published | September 2005 | ||
| Format | White Papers | ||
| Topics | |||
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