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Match Document Document Title
7362671 Optical disc recording and/or playing apparatus and method  
A data recording and/or playing method for recording or playing data to or from an optical disc having a first recording area, where a frame sync signal and the data are recorded, and a second...
7099247 Disk drive apparatus  
A disk drive apparatus drives, by means of a motor, a disk mounted thereon so as to reproduce signals recorded in the disk. The disk drive apparatus has an edge detecting unit for generating an...
7082086 Disc apparatus  
A disk apparatus ( 10 ) includes an optical pick-up ( 12 ) and a DSP ( 28 ), and irradiates a laser beam onto a recording surface of a disk recording medium ( 100 ) by the optical pick-up. In a...
7065018 CLV system and method using PSA lookup  
A system and method for controlling operation of a motor system that addresses the design challenges for the small form factor optical disk system. The control system can be operable to read a...
7042821 Disk drive apparatus for optimum motor control  
A disk drive apparatus drives, by means of a motor, a disk mounted thereon so as to reproduce signals recorded in the disk. The disk drive apparatus has an edge detecting unit for generating an...
6898170 PMAD/PSA digital feedback system  
A system and method for controlling operation of a motor system that addresses the design challenges for the small form factor optical disk system. The control system can be operable to obtain...
6751174 Disc reproducing system  
A disc playback system according to this invention, as shown in FIG. 1 , comprises a pickup 1 for reading information from an information disc 2 on which data are recorded at a constant linear...
6477124 Varying the rate at which data appear on an optical disc rotated at a constant linear velocity to prevent unauthorized duplication of the disc  
Apparatus and method for recording data to an optical disc to prevent unauthorized duplication of the disc. The disc includes a data placement zone to which first data are written at a first data...
6424608 Optical apparatus used for optical disk recording and reproducing apparatus  
An optical apparatus for an optical disk recording/reproducing apparatus including a recording laser light emitting device emitting a recording beam for recording data on an optical disk, a...
6356523 Apparatus for reproducing information recorded on optical disc  
An apparatus for reproducing information recorded on an optical disc which can favorably accomplish a time base correction for a read signal in a simple configuration. Also, the apparatus precisely...
6259661 Disk reading apparatus with rotary speed adjustment feature  
A disk reading apparatus for reading data recorded on a disk medium is disclosed. The disk reading apparatus comprises a motor for rotating the disk medium, a vibration sensor section for detecting...
6212143 Spindle motor control system for a disk player  
In a CLV control of a spindle motor, a clock extracting unit (5) extracts a clock component from the reproduction data, and a CLV control unit (6) controls the spindle motor (8) in accordance with...
6088315 Disc recording and/or reproducing apparatus and its motor drive control circuit  
A motor rotation control circuit of a disc recording and/or reproducing apparatus has first and second rotation control units and a switching circuit. Information extracted from data read out from...
6032276 Apparatus and method for reading data from a disk type recording media  
An apparatus and method for reading data from a disk-type recording medium. The present invention controls the number of revolutions at which the recording medium rotates at according to the...
6009056 Optical disc data reproducing method and optical disk driver  
In the operation to access data on a disk, the data reading operation is enabled before the rotary speed of the spindle motor of the disk is completely regulated to thereby minimize the access time...
5982728 Reading information from a disk-shaped recording medium that is rotatable at a plurality of speeds  
A reproducing apparatus for disk-shaped recording medium rotationally drives the disk-shaped recording medium at a particular speed to read information from a recording track disposed...
5946279 Servo circuit, digital PLL circuit and optical disk device  
A speed error detecting portion detects a speed error which is a frequency difference between a reproduced clock signal which is reproduced from a recording medium and a reference clock signal. A...
5910934 Disc reproducing apparatus and method with adjustment of rotation speed between read positions  
A disc reproducing apparatus such as a disc player and a method of the same which of the seek time can be shortened at the time of traverse of a pick-up, by calculating a line speed at a read...
5870363 Optical disk motor servo and method for closed loop speed control  
An optical disk drive in which changes in rotational speed are achieved under closed loop control, avoiding significant undershoots or overshoots in speed, increasing access time and reducing...
5835463 Spindle motor control system for use in an optical disk player  
In the case where a CPS unit (9) detects a period of clock components of reproduction data to be within a given range, the spindle motor (8) is driven in the CLV mode in stable and the mean value...
5825732 Rotation control circuit based on the mean value of run length code generation patterns reproducing apparatus equipped with the rotation control circuit  
Disclosed are a rotation servo circuit and a reproducing apparatus equipped therewith. In the rotation servo circuit, the average value of an inversion probability pattern of a run length code...
5774437 Rotation control apparatus and rotation control method for disk type information record medium  
On an information record medium, a plurality of synchronization signals are recorded by a predetermined record interval such that a record interval of two consecutive synchronization signals is...
5748587 Spindle servo circuit in high-speed optical disk reproducer  
A spindle servo circuit in an optical disc reproducing apparatus operates with enhanced stability at disc rotation speeds substantially higher than normal. The spindle servo circuit includes a...
5745457 Optical disk player with coarse and fine speed control  
An optical disk player utilizes an analog read signal generated from a pickup. The analog read signal is converted to a digital read signal consisting of a plurality of bits in synchronism with a...
5694380 Disc player apparatus having a disc rotational speed controller  
A disc reproduction apparatus, configured so that a voltage-controlled oscillator is used as a means of giving a reference frequency to an analog phase-locked loop circuit, a control voltage based...
5642342 Apparatus for controlling the rotational speed of an optical-disc  
A first servo unit controls a rotational speed of an optical disc using a reproduced signal obtained as a result of reading a signal previously written on the optical disc. A second servo unit...
5627811 Constant linear velocity optical disk apparatus having improved circuitry for speed data access  
An optical disk apparatus includes a disk servo unit which generates a servo signal based on a data signal read from an optical disk. The servo signal is supplied to a disk motor to control a...
5621710 CD-ROM Drive and a control method for optimally controlling the spindle motor  
CD-ROM drive, including a pick-up for detecting recorded data from a CD-ROM, a control signal generation part for generating a acceleration/deceleration control signal, a driving extent control...
5612933 Apparatus for reproducing recorded information with error detection and correction processing  
An apparatus for reproducing recorded information reads information from the track surface of a CD-ROM disk 1, performs error detection and correction processing on the read information to...
5592446 Dual mode recording and reproducing apparatus having two recording regions using differing reproduction principles  
A recording and/or reproducing apparatus for a disc shaped recording medium having a first recording region in which an information signal is recorded using pits and a second recording region in...
5590106 Disc player having a plurality of reading means for reading information on a disc  
A plurality of pickups are provided for reading information recorded on a disc. Each of the pickups is provided with a signal processing system and a control system. Each of the signal processing...
5583841 Apparatus for improved search on information storage member rotating at constant linear velocity  
In a data reproducing apparatus, an optical pick-up is radially movable with respect to, and recovers information from, an information storage member. A motor rotates an information storage member....
5561644 Short seeking time optical disc apparatus  
In an optical disk apparatus for recording and/or reproducing a predetermined data on/from a disk recording medium rotated by constant linear velocity (CLV) system, at seek operation for moving the...
5511061 Filter circuit, filtering method and disc rotation control method and apparatus  
A control signal relating to rotation of a disc or an output signal is selectively output. A selectively output signal is amplified at a first amplification factor. A signal amplified at the first...
5465244 Disc reproducing apparatus  
A disc reproducing aparatus is provided which is able to read out all of the data stored on the disc in a short time. The disk reproducing apparatus reproduces data stored on a disc and comprise a...
5432766 Circuit for varying a loop gain of a spindle servo  
In a spindle servo circuit for controlling rotation of a disc, a loop gain of a spindle servo can be varied and a reproduced synchronizing signal from the disc and a reference signal are compared...
5315571 Information recording and reproducing device providing faster access time to a recording medium  
An information recording and reproducing device has a first recording clock generation circuit which generates a clock based on pre-recorded information on a magneto-optical disk, a second...
5220551 Spindle control apparatus for disk player  
A spindle control apparatuses for a disk player allows a quick search of recorded data on a disk carrying a plurality of types of data that should be read out at different reading velocities. A...
5111305 Video disk player having CLV format  
In a video disk player during the scan reproducing mode, a jump of a calculated number of tracks is carried out so that, even when a video disk is recorded according to the constant linear format,...
5109369 Optical disk drive  
An optical disc drive is disclosed in which an optical disc on which pregrooves are formed for affording wobble signals frequency modulated by predetermined data signals is driven at a constant...
5107479 Optical recording/reproducing apparatus  
An optical recording/reproducing apparatus records an information signal on a rotary optical disk by irradiating an optical beam having an optical power such that an energy sufficient to cause...
5040076 Video disk player including signal switching synchronization  
In a video disk player, internal and external synchronization are based on comparing the phases of reproduced and reference pulses. The controlled frequencies responsive to the phase difference are...
4984227 Optical disc device  
An optical disc device includes a disc drive unit for driving an optical disc to rotate at a constant rotating speed, and an optical head for recording and reproducing data to and from the optical...
4896311 Disk apparatus  
An optical disk apparatus reads identification data recorded at a predetermined timing in a predetermined position of a loaded optical disk. The type of the optical disk is judged according to the...
4885644 Spindle servo device for data recording disk reproducing apparatus  
An apparatus for playing a composite disk containing separate audio-only and video-plus-audio portions, as well as an ordinary compact disk. It is first detected whether the disk being played is a...
4855978 Video/compact disk player having reduced track search time  
A player system for a video disk or a compact audio disk in which the time to move the pickup to the start of a playing position of a selection other than at the beginning of the disk is...
4855847 Video disk reproducing device having improved motor speed control  
A data reproducing device with which, in reproducing a digitized audio signal, the speed of movement of a data detecting point of a pickup relative to the recording medium is controlled with high...
4815063 Disc motor control circuit for controlling the rotation of a disc in a disc playing device  
In one aspect of the invention, a disc motor control circuit in a disc playback device comprises a rotation detection circuit for detecting the rotation speed of a disc motor and producing a...
4783774 Control system for optical information reproducing apparatus  
A control system for an optical disc information reproducing apparatus in which information data stored in an optical disc is read out during a rotation of the optical disc by a light spot of a...
4757489 Rotation control apparatus for controlling rotation frequency of an information recording disc which is to be rotated at a constant linear velocity  
A rotation control apparatus controls a rotation frequency of a disc which is to be rotated at a constant linear velocity. The rotation control apparatus comprises a circuit for obtaining a first...
Matches 1 - 50 out of 59 1 2 >