Patent ID: 7567615

Claim:
An adaptive equalization circuit, comprising: an analog-digital conversion device for sampling signals read from a recording medium; a first digital equalization device for equalizing waveforms of first output signals from said analog-digital conversion device; a phase synchronization device for synchronizing phases for second output signals from said first digital equalization device; an equalization target value generation device for generating an equalization target value of said first digital equalization device from third output signals from said phase synchronization device, and for outputting fourth output signals; a second digital equalization device for inputting the third output signals from said phase synchronization device and performing adaptive equalization; a first factor computation device for receiving as input signals said first, second, and fourth output signals, and for computing tap factors of said first digital equalization device from said first, second, and fourth output signals; and a second factor computation device for computing tap factors of said second digital equalization device from the third output signals from said phase synchronization device and fifth output signals from said second digital equalization device.