| 摘要 |
PURPOSE:To fulfil low frequency reproduction by adopting the constitution of the speaker device such that either of two speakers of the identical performance is provided with a low pass filter whose pass band is less than a specific frequency or below and a group delay circuit having a specific range of delay time connecting to the filter. CONSTITUTION:A 100Hz low pass filter 14 shifts the phase of a signal having a frequency lower than 100Hz, because the frequency below 100Hz is sensed by human being as a low frequency. Moreover, a group delay circuit 15 is provided with a delay time of 1/100-1/40sec and a phase shift is provided between speakers 12 and 13 at a frequency less than 100kHz. The increase in stiffness around the minimum resonance frequency is suppressed because of the phase shift between the two speakers 12 and 13 and the increase in the frequency is less. Through the constitution above, the low sound reproducing capability is improved. |
