| 摘要 |
A reproduced signal is adaptively equalized in an adaptive equalizer after going through an AD converter. The AD converter, the adaptive equalizer, a phase error detector, a phase shifter, a DA converter, a loop filter, and a variable frequency oscillation circuit, all of which structure a PLL circuit, and a clock signal phase-locked to reproduced data is fed back to the AD converter. The phase shifter slightly shifts, as appropriate, a phase error detected in the phase detector according to the change in a barycenter of tap coefficients detected in a tap barycenter detection circuit. With such structure, signals can be processed in an accurate manner without causing competition in operation between the PLL and adaptive equalization.
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