| 摘要 |
PURPOSE:To prevent the acoustic image normal position from being spoiled by a leakage high frequency component by enlarging an inclination of a cut-off area in the case of a prescribed frequency or above, in the case a cut-off frequency of a woofer speaker is heightened in accordance with each frequency characteristic of L and Rch loudspeakers. CONSTITUTION:Matching of Lch and Rch loudspeakers 11, 13 for allowing a low frequency signal of a sum signal of left and right signals to pass through by an LPF 1, varying its cut-off frequency, allowing an inclination of a cut-off area shifted from a passing area to a stopping area to coincide with a low band inclination of a stereo signal reproducing loudspeaker, and reproducing the left and the right signals, and a woofer speaker for reproducing a low frequency signal of the sum signal of the left and the right signals is adjusted. Also, the low frequency signal is allowed to pass through by an LPF 2, and its cut-off frequency is fixed smaller than a frequency by which an acoustic image normal position sense is not generated, therefore, the LPF 1 is connected in series. Accordingly, by both the frequency characteristics, while maintaining the characteristic of the LPF 1, a cut-off area inclination becomes large from a threshold frequency by which the acoustic image normal position sense is not generated, and the acoustic image normal position is held. |
