Parameter determination device, method, program and recording medium for determining a parameter indicating a characteristic of sound signal

The parameter determination method, implemented by a parameter determination device, comprising:

• receiving, by processing circuitry of the parameter determination device, a time domain sound signal as a time-series signal;
• a spectral envelope estimating step, by the processing circuitry, of performing estimation of a spectral envelope using a parameter η0 specified in a predetermined method, regarding the η0-th power of absolute values of a frequency domain sample sequence corresponding to the time-series signal as a power spectrum on the assumption that the parameter η0 and a parameter η are positive numbers;
• a whitened spectral sequence generating step, by the processing circuitry, of obtaining a whitened spectral sequence which is a sequence obtained by dividing the frequency domain sample sequence by the spectral envelope;
• and
• a parameter acquiring step, by the processing circuitry, of determining, as a parameter representing the characteristic of the time-series signal, such a parameter η that generalized Gaussian distribution with the parameter η as a shape parameter approximates a histogram of the whitened spectral sequence.