Entries |
Document | Title | Date |
20090034381 | RECORDING/REPRODUCING DEVICE, RECORDING CONDITION ADJUSTING DEVICE AND RECORDING/REPRODUCING METHOD - A calculation of a reliability value |Pa−Pb|−Pstd, representing represents a maximum likelihood decoding result on a portion which corresponds to a start or termination edge of a recording mark and has a high probability of error occurrence by a maximum likelihood decoding method, is performed on each combination of a predetermined mark length and a space length immediately before the mark and each combination of the mark length and a space length immediately after the mark. Based on the calculation result, a recording parameter is optimized, and recording reflecting the optimized recording parameter is performed. | 02-05-2009 |
20090296548 | METHOD FOR MEASURING AND OPTIMIZING RADIAL TO VERTICAL CROSSTALK - A method and system are provided, for reducing the amount of radial to vertical crosstalk in an error signal in an optical record carrier reader. The method comprises the steps of: measuring error signals in a plurality of error signal control loops of the reader, comprising a focus error signal control loop; calculating power dissipation in each error signal control loop for determining the amount of radial to vertical crosstalk in the focus error signal control loop. Countermeasures may be applied to the error signal control loops to minimize or optimize the radial to vertical crosstalk. | 12-03-2009 |
20100202265 | Optical Disc Reader - An optical disc reader comprising a controller that controls a read operation to read data recorded on an optical disc and a counter that counts the number of zero crossings in a tracking error signal. Between the completion of focusing operation and the start of tracking operation, the controller determines whether or not the light beam is properly focused on a data recording layer in the optical disc based on the number of zero crossings in the tracking error signal counted by the counter. If it is determined that the light beam is not properly focused, the controller causes the focusing operation to be performed again. Otherwise, if it is determined that the light beam is properly focused on the data recording layer, the controller causes the tracking operation to be performed and then starts the read operation. | 08-12-2010 |
20100232275 | DISK APPARATUS - Stable interlayer jump is realized by judging whether a signal is a false signal caused by noises, stray light, or interference of an adjacent layer or a true FE signal. | 09-16-2010 |