Optical disk device and phase-locked loop circuit
A technology of optical disc device and light beam, which is applied in the direction of electrical components, head configuration/installation, optical recording/reproduction, etc., and can solve problems such as long start-up time
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no. 1 example
[0065] FIG. 1 is a block diagram illustrating the structure of an optical disc device 100 according to the first embodiment of the present invention.
[0066] In the operation performed by the optical disc device 100, the optimal combination of cutoff frequency and increment is determined as follows. The variables x and y are given as variables that can change the jitter, and the best combination of X and Y that minimizes the jitter is determined. To simplify the description, in this embodiment, the variable x represents the cut-off frequency and the variable y represents the increment. The X-Y plane defined by the variables x and y is divided into a plurality of first regions at a prescribed ratio. Among the plurality of first regions, the region where the jitter is the minimum is determined. The determined first area is further divided into a plurality of second areas. Among the plurality of second areas, the area where the jitter is the minimum is determined. By repeating this ...
no. 2 example
[0159] FIG. 17 is a block diagram showing the structure of an optical disc device 500 according to the second embodiment of the present invention. The optical disc device 500 is used for reproducing various types of optical discs. The same elements as those in FIG. 1 discussed earlier use the same reference numerals, and detailed explanations thereof are omitted.
[0160] The optical disc device 500 generally performs the functions described below. An x-y plane defined by variables x and y as an initial area is divided into a plurality of first areas having the same rectangle. According to the type of the disc loaded on the optical disc device 500, one of the plurality of first areas is selected. The selected first area is further divided into a plurality of second areas, and each second area has a jitter measurement point at the center of gravity. A second area is determined from the plurality of second areas, and the jitter measured at the jitter measurement point of the area is...
no. 3 example
[0188] FIG. 21 is a block diagram showing the structure of an optical disc device 600 according to the third embodiment of the present invention. The same elements as those in the aforementioned FIG. 1 use the same reference numerals and detailed descriptions thereof are omitted.
[0189] In a type of optical disc, the information stored in its inner zone will be reproduced at a reproduction rate, and the information stored in its outer zone will be reproduced at a different reproduction rate. In order to continuously reproduce the information stored in the inner zone and the outer zone of such an optical disc, the optical disc device 600 dynamically changes the reproduction rate. Such an optical disc device 600 is used as, for example, a CAV (constant angular velocity) reproduction device.
[0190] The optical disc device 600 generally performs the functions described below. An x-y plane defined by the variables x and y as an initial area is divided into a plurality of first area...
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