Constructing broad-band acoustic signals from lower-band acoustic signals


Ontology type: sgo:Patent     


Patent Info

DATE

2010-04-13T00:00

AUTHORS

Bhiksha Ramakrishnan , Paris Smaragdis

ABSTRACT

A method generates envelope spectra and harmonic spectra from an input broad-band training acoustic signal. Corresponding non-negative envelope bases are trained for the envelope spectra and non-negative harmonic bases are trained for the harmonic spectra using convolutive non-negative matrix factorization. Higher-band frequencies are generated for an input lower-band acoustic signal according to the non-negative envelope bases and the non-negative harmonic bases. Then, the input lower-band acoustic signal is combined with the higher-band frequencies to produce an output broad-band acoustic signal. More... »

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