Sound processing method and sound processing apparatus
AssigneeYamaha Corporation
InventorsRyunosuke Daido, Hiraku Kayama
Life of this patent
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Abstract
A sound processing method includes a step of applying a nonlinear filter to a temporal sequence of spectral envelope of an acoustic signal, wherein the nonlinear filter smooths a fine temporal perturbation of the spectral envelope without smoothing out a large temporal change. A sound processing apparatus includes a smoothing processor configured to apply a nonlinear filter to a temporal sequence of spectral envelope of an acoustic signal, wherein the nonlinear filter smooths a fine temporal perturbation of the spectral envelope without smoothing out a large temporal change.
Claims6
A sound processing method comprising:
- supplying an acoustic signal;
- improving a sound quality of the supplied acoustic signal by:
- applying a nonlinear filter to a temporal sequence of original spectral envelope of the supplied acoustic signal to smooth fine temporal perturbation of the original spectral envelope without smoothing out a larger temporal change of the original spectral envelope;
- and
- adjusting the supplied acoustic signal having the original spectral envelope using a temporal sequence of spectral envelope smoothed by the nonlinear filter to generate an acoustic signal having the spectral envelope in which the fine temporal perturbation has been smoothed;
- and
- outputting the acoustic signal having the spectral envelope in which the fine temporal perturbation has been smoothed.
A sound processing apparatus comprising:
- a sound supplying device that supplies an acoustic signal;
- a smoothing processor configured to improve sound quality of the supplied acoustic signal by:
- applying a nonlinear filter to a temporal sequence of original spectral envelope of the supplied acoustic signal to smooth fine temporal perturbation of the original spectral envelope without smoothing out a larger temporal change of the original spectral envelope;
- and
- adjusting the supplied acoustic signal having the original spectral envelope using a temporal sequence of spectral envelope smoothed by the nonlinear filter to generate an acoustic signal having the spectral envelope in which the fine temporal perturbation has been smoothed;
- and
- a sound emitting device that outputs the acoustic signal having the spectral envelope in which the fine temporal perturbation has been smoothed.
Dependencies are inferred from the claim text.