ACOUSTIC REPRODUCING DEVICE

摘要

PURPOSE:To attain the uniform directivity control from a low frequency to a high frequency by connecting an LPF having a different cut-off frequency to each speaker except a speaker at the center. CONSTITUTION:A signal amplified by an amplifier 1 is branched into plural signals and they are applied to speakers 3a-3e via LPFs 2a-2d. Then a speak- er 3c located at the center among the speakers 3a-3c receives the signal directly not through the LPF. The cut-off frequency of the LPFs 2a-2d is set so that the cut-off frequency of the LPF2b, 2c is higher than that of the LPFs 2a, 2d. The uniform directivity control from a low frequency to a high frequency is attained by connecting the LPF in this way.