| 摘要 |
PROBLEM TO BE SOLVED: To set a desired delay time to a delay equipment so that an audio sound in non-control band and an audio sound in control band can simultaneously reach an observation point. SOLUTION: An adaptive signal processing part 75 in a delay time determining part 70 executes adaptive signal processing to simulate the signal propagating system of non-control band in a cabinet internal acoustic space by an adaptive filter 71, and a maximum coefficient/delay time searching part 76 determines the peak position of impulse response of the signal propagating system in reference to the coefficient value of the adaptive filter 71, determines a signal propagating time td from this peak position, and sets the difference Δt between the signal propagating time (t) in control band and td to a delay equipment 61 as a delay time, so that the audio signal in control band and the audio signal in non-control band simultaneously can reach an observation point. |
