US 6,687,204 B2 · Crosstalk removal apparatus and information reproduction apparatus

Abstract

There is disclosed a crosstalk removal apparatus in which a main track, one adjacent track, and the other adjacent track in a disk with the tracks formed therein are irradiated with light beams at predetermined intervals in a tangent direction by a pickup. A CTC unit uses delay amounts of respective sample value series corresponding to a reproduction signal of the main track and those of the adjacent tracks to correct delays, and outputs a CTC output signal from which a crosstalk component is removed. A wobble signal detector detects wobble signals of the respective tracks based on a push-pull output of the disk, and a delay circuit controller obtains optimum delay amounts based on a phase relation of the respective wobble signals and sets the delay amounts in the CTC unit.

Claims10

Dependent claims

A crosstalk removal apparatus which removes a crosstalk of one adjacent track and the other adjacent track included in a reproduction signal of a main track based on the reproduction signal of the main track as a reproduction object of an information recording medium and reproduction signals of the adjacent tracks, the crosstalk removal apparatus comprising:

a crosstalk removal device which delays the reproduction signals of the main track and the adjacent tracks by predetermined delay amounts corresponding to respective reproduction time differences, extracts the crosstalk from the reproduction signals of the one and other adjacent tracks, and removes the crosstalk from the reproduction signal of the main track;
a wobble signal detection device which detects wobble signals corresponding to a wobbling applied to the main track and the adjacent tracks;
and
a delay amount control device which obtains optimum delay amounts based on a phase relation of the detected wobble signals, and controls the delay amounts to be set with respect to the crosstalk removal device.

1 more element

An information reproduction apparatus which reproduces recording information from an information recording medium with tracks formed therein, the information reproduction apparatus comprising:

a reproduction device which generates respective reproduction signals based on reflected lights obtained in irradiating a main track as a reproduction object, one adjacent track, and the other adjacent track with light beams at predetermined intervals in a tangent direction;
a crosstalk removal device which delays the reproduction signals of the main track and the adjacent tracks by predetermined delay amounts corresponding to respective reproduction time differences, extracts a crosstalk from the reproduction signals of the one and other adjacent tracks, and removes the crosstalk from the reproduction signal of the main track;
a wobble signal detection device which detects wobble signals corresponding to a wobbling applied to the main track and the adjacent tracks;
and
a delay amount control device which obtains optimum delay amounts based on a phase relation of the detected wobble signals, and controls the delay amounts to be set with respect to the crosstalk removal device.

2 more elements

Dependencies are inferred from the claim text.

Crosstalk removal apparatus and information reproduction apparatus

Life of this patent

Crosstalk removal apparatus and information reproduction apparatus

Life of this patent

Abstract

Claims10