Patent ID: 8310905
Filing Date: 2012-11-13
Classification: G11B

Abstract:
1. A wobble signal extracting circuit, comprising: a readout signal generating circuit for generating an RF signal by adding a first detection signal and a second detection signal that correspond to reflected light rays of areas inside and outside a record track, respectively, among reflected light rays from an optical disk; a first subtractor for generating a push-pull signal by performing subtraction between the first detection signal and the second detection signal; a first analog-to-digital converter for converting the RF signal into a digital signal; a second analog-to-digital converter for converting the push-pull signal into a digital signal; a residual RF component generating circuit for generating a residual RF signal component equivalent to an RF signal component remaining in the digitized push-pull signal; and a second subtractor for generating the wobble signal by subtracting the residual RF signal component from the digitized push-pull signal, wherein the residual RF component generating circuit generates the residual RF signal component so that it may approach the remaining RF signal component based on correlation between the wobble signal and the digitized RF signal.