Method for extracting the formant of a musical tone, recording medium and apparatus for extracting the formant of a musical tone
AssigneeKabushiki Kaisha Kawai Gakki Seisakusho
InventorHiroshi Sato
Life of this patent
Estimating the term…
Abstract
There are provided a power line spectrum extractor for extracting power line spectra of a waveform to be processed; a level interpolation controller for performing level interpolation control on the power line spectra at every unit of a certain frequency, which is not higher than half a sampling frequency; and a cepstrum analyzer for performing Fast Fourier Transformation on the power spectra subjected to the level interpolation control and performing Inverse Fast Fourier Transformation on values found by performing level setting with a specified coefficient.
Claims7
A method for extracting formants of a musical tone comprising the steps of:
- finding power line spectra of a waveform to be processed;
- performing level interpolation control on the power line spectra at every unit of a certain frequency, which is up to and including half a sampling frequency;
- performing Inverse Fast Fourier Transformation or Fast Fourier Transformation on the power spectra subjected to the level interpolation control;
- performing level setting with a specified coefficient;
- and
- performing Inverse Fast Fourier Transformation or Fast Fourier Transformation on values found by performing the level setting with the specified coefficient.
A computer-readable recording medium having a program saved thereto, the program causing a computer to perform the steps;
- finding power line spectra of a waveform to be processed;
- performing level interpolation control on the power line spectra at every unit of a certain frequency, which is up to and including half a sampling frequency;
- performing Inverse Fast Fourier Transformation or Fast Fourier Transformation on the power spectra subjected to the level interpolation control;
- performing level setting with a specified coefficient;
- and
- performing Inverse Fast Fourier Transformation or Fast Fourier Transformation on values found by performing the level setting with the specified coefficient.
An Apparatus for extracting formants of a musical tone comprising:
- a power line spectrum extractor, which extracts power line spectra of waveform to be processed;
- a level interpolation adjuster, which performs level interpolation control on the power line spectra at every unit of a certain frequency, which is up to and including half a sampling frequency;
- and
- a cepstrum analyzer, which performs Fast Fourier Transformation or Inverse Fast Fourier Transformation on the power spectra subjected to the level interpolation control and performs Inverse Fast Fourier Transformation or Fast Fourier Transformation on values found by performing level setting with a specified coefficient.
Dependencies are inferred from the claim text.