Method and apparatus for enhancing loudness of an audio signal
AssigneeMotorola, Inc.
InventorsMarc A. Boillot, John G. Harris, Thomas L. Reinke, Zaffer S. Merchant, Jaime A. Borras
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Abstract
Human hearing perceives loudness based on critical bands corresponding to different frequency ranges. As a sound's frequency spectrum increases beyond a critical band into a pr3eviously unexcited critical band, the perception is that the sound has increased in loudness. To take advantage of this principle, a filter is applied to a speech signal so as to expand the formant bandwidths of formants in the speech sample.
Claims4
A method for increasing the perceived loudness of a speech signal, the speech signal having a plurality of formants, each formant having a natural bandwidth, the method comprises filtering the speech signal so as to expand the bandwidths of each of plurality of formants beyond a natural bandwidth.
Dependencies are inferred from the claim text.