Patent ID: 6996168

Claim:
A signal-processing circuit, comprising: a phase-locked loop circuit for receiving playback data resulting from analog-to-digital conversion of a playback signal from an equalization circuit, wherein said equalization circuit is composed of a transversal filter, wherein said equalization circuit comprises a first equalization circuit and a second equalization circuit provided on a downstream side from said phase-locked loop circuit, a sampling frequency of said first equalization circuit is made approximately equal to a channel clock frequency; a subsequent transfer characteristic of said first equalization circuit is made equal to a product of a present transfer characteristic of said first equalization circuit and a present transfer characteristic of said second equalization circuit; and a subsequent transfer characteristic of said second equalization circuit is flattened, and wherein said transversal filter is used for each of said first equalization circuit and said second equalization circuit to obtain said subsequent transfer characteristic of said first equalization circuit by setting a subsequent tap coefficient of said first equalization circuit to a result of a convolutional integration of a present tap coefficient of said first equalization circuit and a present tap coefficient of said second equalization circuit.