| 摘要 |
PROBLEM TO BE SOLVED: To provide the audio equipment where a level for each frequency is adjusted without changing the phase characteristic with less arithmetic amount and the user can make fine-adjustment while confirming sound quality. SOLUTION: A fast Fourier transformer section 11 applies fast Fourier transformation to an input signal x(n) in time domain into an input signal X(k) in frequency domain. Then a filtering processing section 12 adjusts a level for each frequency of the input signal X(k) based on a center frequency, a half-amplitude level, and a gain set by the user to obtain an output signal Y(k) in the frequency domain. Then a fast Fourier inverse transform section 13 applies fast Fourier inverse transformation to the output signal Y(k) in the frequency domain into an output signal y(n) in the time domain. |
