| 摘要 |
<p>High-order partial response is equalized so that the equalization difference of an input signal having nonlinear distortion is a minimum so as to improve the characteristics of a reproduced signal. An input signal is subjected to high-order partial response equalization by a transversal filter (3), a tentative estimation value of an equalization target value is estimated by a tentative estimating circuit (4), the difference between the tentative estimation value and the input signal is detected by a difference detecting circuit (5), the difference between the tentative estimation value and the output signal of an analog-digital converter (1) is detected by an input distortion detecting circuit (7), the difference outputted from the difference detecting circuit (5) is monitored by an output distortion detecting circuit (6), the equalization target value is controlled by equalization target controlling means (8) so that the equalization difference is a minimum, and a tap coefficient is controlled by tap coefficient controlling means (10).</p> |
