| 摘要 |
<p>PURPOSE:To make correspondence the phase delay in each filter output, by splitting each band through the use of the group delay filter and the delay circuit. CONSTITUTION:The input signal is amplified after being split in each band. The low region is picked up with the group delay flat low pass filter 8, and the high region is picked up with the group delay flat high pass filter 7. Since the group delay time of the low pass filter 8 is greater than that of the high pass filter 7, compensation is made by providing the delay circuit 9 after the high pass filter 7. The group delay flat filter can be realized with the operational amplifier, such as pulse shape type filter and Bessel function filter.</p> |
