Abstract: A voice synthesis method includes: sequentially acquiring voice units in accordance with synthesis information for synthesizing voices; generating statistical spectral envelopes using a statistical model in accordance with the synthesis information for synthesizing the voices; and concatenating the sequentially acquired voice units and modifying a frequency spectral envelope of each voice unit in accordance with the generated statistical spectral envelope, thereby synthesizing a voice signal based on the concatenated voice units having the modified frequency spectra.

Abstract: A signal processing device includes a plurality of harmonics attenuation filters configured to have different bandpass characteristics and configured to generate signals to be used for estimation of a fundamental frequency of an input signal by restricting the bandwidth of the input signal. Each of the harmonics attenuation filters comprises a filter that has an accumulator and a comb filter which are connected in cascade. The accumulator is configured to accumulate input signals thereto. The comb filter is configured to output a difference between an input signal to the comb filter and a signal obtained by delaying the input signal to the comb filter.

Abstract: A method for processing an input sound signal of singing voice, to obtain a sound signal with an impression different from the input sound signal, includes: selecting a genre from among a plurality of tune genres in accordance with a selection operation by a user, setting, to a first unit, a set of first parameters corresponding to the selected genre, displaying a first impression identifier corresponding to the selected genre for a first control of a first user parameter in the set of first parameters, changing the first user parameter in accordance with a change operation on the first control by the user, and strengthening, by the first unit, signal components within a particular frequency band of the sound signal, in accordance with the set of first parameters including the first user parameters.

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.