Cross-talk removal apparatus and data reproduction apparatus
AssigneePioneer Corporation
InventorsShogo Miyanabe, Hiroki Kuribayashi
Life of this patent
Estimating the term…
Abstract
In a cross-talk canceller (CTC) that removes the cross-talk from the adjacent tracks that is contained in the reproduction signal from the main track, a sample-value series S1′ for the reproduction signal from the adjacent track is input to a correlation-detection unit to find its correlation with the signal pattern of the signal output from the CTC that is detected by a pattern-detection unit, and then it passes through one of the correction-coefficient units that is connected by the switch and then integrated by the integrator, and the tap coefficient used by the variable filter of the CTC is obtained to a narrow control frequency zone.
Claims10
A cross-talk removal apparatus that removes cross-talk from one or the other or both adjacent tracks, which is contained in the reproduction signal from a main track on a data-recording medium that is to be reproduced, based on the reproduction signal from said main track and the reproduction signals from said one or the other or both adjacent tracks and comprising:
- a cross-talk removal device of using a variable filter with a controllable coefficient to extract the cross-talk from the reproduction signal of said one or the other or both adjacent tracks and removing said cross-talk from the reproduction signal of said main track;
- a coefficient control device of controlling the coefficient of said variable filter using a changeable control frequency zone;
- and
- a control frequency zone setting device of determining the recording state of said one or the other or both adjacent tracks and switching said control frequency zone according to said recording state,
- wherein said control frequency zone setting device sets said control frequency zone to be wide for a specified period of time when the recording state of said one or the other or both adjacent tracks changes from an non-recorded state to a recorded state.
A data reproduction apparatus that reproduces recorded data from a data-recording medium on which tracks are formed and comprising:
- a reproduction device of generating a reproduction signal for a main track to be reproduced and the reproduction signals of one or the other or both adjacent tracks based on light that is reflected when said main track and said one or the other or both adjacent tracks are irradiated with a light beam;
- a cross-talk removal device of using a variable filter with a controllable coefficient to extract the cross-talk from the reproduction of said one or the other or both adjacent tracks and removing said cross-talk from the reproduction signal of said main track;
- a coefficient control device of controlling the coefficient of said variable filter using a changeable control frequency zone;
- and
- a control frequency zone setting device of determining the recording state of said one or the other or both adjacent tracks and switching said control frequency zone according to said recording state,
- wherein said control frequency zone setting device sets said control frequency zone to be wide for a specified period of time when the recording state of said one or the other or both adjacent tracks changes from an non-recorded state to a recorded state.
Dependencies are inferred from the claim text.