Class / Patent application number | Description | Number of patent applications / Date published |
369440340 | Sampling servo system | 6 |
20080219112 | Software programmable timing architecture - An apparatus for generating a digital signal pattern may comprises a memory, a program sequencer, first and second circuits, and an event execution unit. The memory may have stored therein a plurality of instructions that, when executed, cause a digital signal pattern to be generated on a plurality of nodes. The program sequencer may be configured to control a sequence in which the plurality of instructions are retrieved from the memory and executed. The first circuit may sequentially step through a plurality of different output states in response to a clock signal. The second circuit may identify an output event when an output state of the first circuit corresponds to an output state identified by retrieved instructions of a particular type. The event execution unit may control states of signals on the plurality of nodes in a manner specified by the retrieved instructions of the particular type in response to the second circuit identifying an output event. | 09-11-2008 |
20080239894 | TRACKING CONTROL METHOD FOR READING/WRITING OPTICAL DISK - In a tracking control method for use in an optical disk drive to read/write an optical disk, an open-loop tracking control operation of the optical disk drive is first performed according to an input tracking error signal and a predetermined periodical offset to generate a dynamic offset. Afterwards, a closed-loop tracking control operation of the optical disk drive is performed according to the input tracking error signal calibrated with the dynamic offset. | 10-02-2008 |
20110211431 | SEMICONDUCTOR INTEGRATED CIRCUIT AND DISK RECORDING AND REPRODUCING DRIVE USING THE SAME - The present invention enables a comprehensive evaluation from both of data read from a disk and a servo signal of a servo controller. The present invention provides a semiconductor integrated circuit mountable to a disk recording and reproducing drive, which comprises a signal processor of an RF signal read from a pickup, a servo controller responsive to a servo error signal read from the pickup, a memory controller, and an external interface. The memory controller is supplied with read data and a servo signal and stores the read data and the servo signal in a buffer memory according to a time division process. The read data and the servo signal stored in the buffer memory can be transferred to an external device via the external interface by the memory controller. | 09-01-2011 |
20110261662 | LENS PULL-IN METHOD FOR NEAR-FIELD OPTICAL ACCESSING SYSTEM - A lens pull-in method is used in a near-field optical accessing system. When a lens is in a far-field range, the lens is driven to approach a surface of an optical disc in an open loop control state. If the lens enters a near-field range, a first GES level is inputted as a set value and the lens is driven in a close loop control state. When the gap error signal decreases to the first GES level, the set value is changed to a second GES level, which is higher than the first GES level. When the gap error signal increases to the first GES level, the set value is changed to a target GES level, so that the gap error signal is maintained at the target gap error signal. | 10-27-2011 |
20120134252 | METHOD OF GENERATING TRACKING ERROR SIGNAL, OPTICAL PICKUP DEVICE, AND OPTICAL DISC DRIVE DEVICE ADOPTING THE METHOD - A method of generating a 1-beam tracking error signal (TES), an optical pickup device, and an optical disc drive device adopting the method. A light-receiving element receives a single reflection beam and detects an alternating current (AC) component and a direct current (DC) component from each of areas formed on two sides of a data track. A servo unit generates a TES by adding and subtracting the AC component and the DC component. | 05-31-2012 |
20130028063 | OPTICAL DISK APPARATUS - The amplitude deviation of a tracking error signal in an optical disk apparatus is reliably corrected by processing signals at low costs. A servo signal generator generates a tracking error signal and a lens error signal from a photodetected signal. A lens error deviation signal memory circuit stores the lens error signal generated at the servo signal generator, and reproduces the one-turn deviation of the lens error signal. A tracking error signal corrector learns an amplitude correcting value for the tracking error signal from the tracking error signal detected in reproducing the one-turn deviation of the lens error signal, and stores the amplitude correcting value in a correcting signal generator. | 01-31-2013 |