Optical disc device
AssigneeMitsubishi Electric Corporation
InventorsKenya Nakai, Masayuki Ohmaki, Nobuo Takeshita
Life of this patent
Estimating the term…
Abstract
A first signal is detected from the central part of a light beam returning from a super-resolution optical disc; a second signal is detected from a peripheral part in a direction corresponding to a track on the super-resolution optical disc; a gain adjustment unit is provided to adjust the amplitude of the first signal; a subtraction unit is provided to generate a third signal by subtracting, from the second signal, the first signal with the amplitude adjusted by the gain adjustment unit; and an unit is provided to generate a reproduced signal by combining the first signal and a signal obtained by delaying the third signal.
Claims6
An optical disc device comprising:
- an optical head apparatus that detects a first signal detected from a central part of a returning light beam from a super-resolution optical disc and a second signal detected from a peripheral part of the returning light beam, the peripheral part being peripheral in a direction corresponding to a track direction on the super-resolution optical disc;
- and
- a signal processing unit configured to generate a reproduced signal by operating on the first signal and the second signal in combination or separately;
- wherein the signal processing unit comprises:
- a gain adjustment unit configured to adjust an amplitude of the first signal;
- a subtraction unit configured to generate a third signal by subtracting, from the second signal, the first signal with the amplitude adjusted by the gain adjustment unit;
- and
- a delay unit configured to generate a fourth signal by correcting a delay between the third signal and the first signal;
- and wherein
- the signal processing unit generates the reproduced signal by combining the first signal with the fourth signal output from the delay unit.
Dependencies are inferred from the claim text.