| 摘要 |
PURPOSE:To independently set an arbitrary amplitude frequency characteristic and an arbitrary phase frequency characteristic, respectively, by being equipped with a setting means to set an impulse response obtained from a convolving means to a transversal filter in making it into a filter coefficient and with the transversal filter to realize the filter of the set coefficient. CONSTITUTION:An impulse signal generated by an impulse generating means 10 is supplied through a signal output means 9, a digital/analog converter 16 and a power amplifier 17 to a loudspeaker 18. To a microphone 19, an impulse response wave, in which both characteristics which the loudspeaker 18 and a sound field 30 have are convolved, is inputted, an impulse response waveform is inputted through a microphone amplifier 20 and an analog/digital converter 21 to a signal input means 1, and the waveform is stored into a storing means 11. A result, obtained by convolving a transmitting function obtained by a reverse amplitude transmitting function arithmetic means 14, the amplitude characteristic inputted by an amplitude input means 1 and a phase input means 2, and the transmitting function obtained by an input transmitting function arithmetic means 13 based on the phase characteristic, is set through a setting means 6 to an FIR filter 7. |
