| 摘要 |
PROBLEM TO BE SOLVED: To enable ideal voice spectra to be obtained without generating an inappropriate spectrum inclination, without sliding projected part of the spectra nor emphasizing recessed part. SOLUTION: An LPC coefficient computing section 102 computes LPC coefficients which are amplitude spectrum approximate shapes of voice signals. Then, a projected part frequency/recessed part frequency determining section 103 obtains projected and recessed part frequencies of the amplitude spectrum approximate shapes, a projected part band/recessed part band determining section 104 determines a projected part band and a recessed part band, which respectively include the projected and recessed part frequencies, from these frequencies. A filter constituting section 106 has a filter having the characteristics in which the amplitude spectra of the frequency components included in the projected part band are emphasized and the amplitude spectra of the frequency components included in the recessed part band are attenuated. By multiplying the characteristics of the filter by a multiplier 109, voice signals are filtered to conduct spectrum emphasis. |
