Abstract: An optical disc drive has a spindle motor for rotating an optical disc; an optical pick-up which can move at least in a radial direction of the optical disc; a sensor for detecting the rotation of the motor; and a spindle servo for controlling the rotation number of the spindle motor based on signals from the sensor. This spindle servo is adapted to be operated at the time of changing the rotation number of the spindle motor, e.g. at the time of changing rotation speed of the spindle motor in multiple steps given by integral multiples of 1 or at the time of changing rotation speed when the optical pick-up moves in the radial direction of the optical disc. According to this optical disc drive, it takes a relatively short time until the rotation speed of the motor reaches the target rotation speed and its rotation becomes stable.

Abstract: A method for setting a rotational speed for rotational readout of useful data stored on a disc-shaped storage medium in a playback device, permitting utilization of a maximum possible data transfer rate at a constant rotational speed. The useful data is stored approximately in data tracks arranged concentrically with an axis of rotation of the disc-shaped storage medium. An outermost data track which is opposite the axis of rotation and has been written with useful data on the disc-shaped storage medium is determined. A value is determined for the amount of data stored in the outermost data track. The rotational speed is set as a function of the amount of data thus determined and a data transfer rate, where the data transfer rate indicates a maximum amount of data that can be read out by the playback device per unit of time, so that the useful data stored in the outermost data track can be read out at the data transfer rate in playback of the disc-shaped storage medium.

Abstract: Disclosed herein are a method for reproducing contents information in an interactive optical disc device and a method for providing contents information in a contents provider server. The interactive optical disc device is connected with the contents provider server via the Internet to receive a variety of contents information provided from the contents provider server. When the sending of the contents information from the contents provider server to the interactive optical disc device is suspended or delayed due to a network connection loss on the Internet or an insufficient storage capacity of a buffer memory in the interactive optical disc device, contents information re-sent from the contents provider server and a data stream read from an interactive DVD are re-synchronized and reproduced. Therefore, a user of the interactive optical disc device can normally watch more various contents information.

Abstract: Systems and methods of distributing multimedia marketing content and collecting marketing data by generating a plurality of autoloading storage devices, providing a multimedia content serving system, sending the storage devices to remote users, causing automatic linking through a network between remote users and the content serving system, updating the static content of a remote user's storage device such as a CD-ROM or DVD by passing variable data, text, pictures, audio and video through a Local-Area Network or Wide-Area Network such as the Internet and to join that data to the contents of the CD-ROM or DVD in a seamless manner to the CD-ROM or DVD user. Further systems and methods for embedding data collection on a storage device such as a CD-ROM or DVD that is used to pass information through a Local-Area Network or Wide-Area Network, such as the Internet. The data collection forms or variable data are stored on the CD-ROM or DVD in a computer software program.

Abstract: A system and method for use in a data storage system which provides a combined phase lock loop (PLL) that utilizes a common Voltage Controlled Oscillator (VCO) and common integrator/loop-filter, but which is operational in a wobble-mode and a data-mode to provide most optimum operation and quick capture. Digital circuitry is primarily used in addition to the VCO and a loop-filter for acquiring frequency and phase lock while the optical disc drive is writing and reading. A digital Phase-detector for operation in the wobble-mode employs a down-counter that can be configured for both Frequency-Lock and Phase-Lock in a way that offers a large capture range and can adapt quickly to the multiple data-zones of the media-format.

Abstract: An optical disc controller of the present invention servo-controls an optical disc device which comprises a disc motor rotating an optical disc and an optical head emitting a light beam for recording data on the optical disc and/or reproducing data from the optical disc. The optical disc controller comprises: a variable clock output section for outputting a plurality of clock signals of different frequencies, and a control section which receives from the optical head a signal indicating a deviation from a predetermined target value to servo-control the light beam of the optical disc device and performs an operation according to the signal indicating the deviation so as to obtain and output a signal indicating a control amount.

Abstract: An information storage medium includes an area in which updated disc-related information and recording-related information updated with a change in at least one of a disc version number and a recording speed is recorded along with existing disc-related information and recording-related information. The existing disc-related information and recording-related information are recorded, and the updated disc-related information and recording-related information is recorded in an area in which the existing disc-related information and recording-related information is recorded. Accordingly, data can be recorded/reproduced on/from a new version of information storage medium even using an existing drive.

Abstract: A clock adjustment device for a data reproduction apparatus includes an edge detection part detecting an edge of a reproduced signal corresponding to a predetermined synchronization pattern based on a state of change of sampled values obtained in synchronism with a clock signal from the reproduced signal, a timing signal output part outputting a timing signal in a given cycle determined by the synchronization pattern from a timing at which the edge of the reproduced signal is detected, and a phase adjustment part adjusting a phase of the clock signal when the edge of the reproduced signal is detected and every time the timing signal is output.

Abstract: When performing writing and/or reading of information to/from an optical disk provided with a wobble including time axis information, an occurrence of a reading error of the time axis information from the wobble is suppressed so that disabled reading of information from the optical disk and an occurrence of a writing error can be prevented. Evaluated parameters such as a CRC error rate of an ATIP signal, an FMDT jitter amount and a phase error between an ATIP synchronization signal and a frame synchronization signal of writing data are evaluated based on a range of set values. When the evaluated parameter is deviated from the range of set values, writing and reading speeds are changed, thereby increasing the reading accuracy of the wobble signal.

Abstract: An optical recording medium for accurately deriving the address information or the disc rotation control information despite narrow track pitch and for recording signals to a high density, and a method and apparatus for recording and/or reproducing such optical recording medium. The optical recording medium has a wobbled groove and pits formed at a pre-set interval in an area between turns of the wobbled groove. The recording/reproducing method includes controlling rotation of the optical recording medium by a wobbled signal from the groove and detecting the position on the optical recording medium of a recording signal by pit signals detected from the pits. The recording/reproducing apparatus includes a detection device for detecting the wobbled signal from the groove and a detection device for detecting pit signals from the pits.

Abstract: A circuit and a method of preventing errors in recording. The circuit includes a first detector to generate a detection pulse by determining whether or not a counted value, which is obtained by counting a cycle of an input wobble signal based on a system clock signal, is in the permissible range of a constant write rate. The circuit further includes a second detector to generate a recording control signal to allow or prohibit a record operation after determining whether the detection pulse meets a predetermined lock condition or a predetermined unlock condition. The circuit prevents errors in recording prevents errors in reproduction data caused by errors in recording, by prohibiting recording if the rotation speed of a disc is not at a desired constant rate in an optical recording and/or reproducing apparatus in which data can be reproduced at a constant or a variable rate and must be recorded at a constant rate. Thus, data can be stably recorded, thereby enhancing recording quality.

Abstract: The present invention provides a method and system for window realignment to correct the data frame boundaries of data from an optical media. The present invention includes: determining if a sync pattern for a data frame is within a sync window; opening an extended sync window, if the sync pattern for the data frame is not within the sync window; determining if the sync pattern for the data frame is within the extended sync window; and realigning the sync window to the sync pattern in the extended sync window, if the sync pattern is within the extended sync window. The present invention utilizes an extended sync window to realign the sync window when the number of missing sync patterns in a data stream has exceeded a threshold number. In the preferred embodiment, the width of the extended sync window and the threshold number are programmable. In this manner, the sync window can be realigned before shifting of the data renders the data uncorrectable.

Abstract: An optical disc system for recoding data onto an optical disc while the optical disc is rotating at a constant angular velocity. The optical disc system includes a PLL for extracting a carrier frequency of a wobble signal outputted from an optical pick-up, a channel synthesizer electrically connected to the PLL for generating a channel clock according to the carrier frequency and a rotating factor of a spindle motor, a data encoder for encoding inputted data according to the channel clock, and a driving circuit for controlling the optical pick-up to record data onto the optical disc according to the encoded data.

Abstract: As the result of the detection of the runaway of the optical disc when the light pickup cannot detect sync signal in the reproducing signal sent from the optical disc, the control circuit turns off the tracking servo mechanism which controls the tracking of the optical disc by the light pickup. The direction of rotation of the optical disc that is running away is detected by comparing the initial mirror count value obtained by counting for a predetermined period of time the mirror pulse detected in correspondence with the RF signal based on the reproducing signal, with the mirror count value during braking obtained by counting the mirror pulse for the predetermined period of time when the spindle motor is applied with the brake pulse. The brake signal working in the direction opposite to the detected direction of rotation is applied to the spindle motor so as to stop the rotation of the optical disc.

Abstract: A tuned circuit is used to detect wobble clock inversions. The tuned circuit reacts to a wobble inversion with a change in amplitude that may be detected by a threshold detector. A bandpass tuned circuit is used to detect wobble clock inversions. The output of the bandpass tuned circuit is input to a saturating high-gain amplifier such as a comparator. The output of the saturating high-gain amplifier reacts to wobble inversions with a half-cycle that has an increased duration as compared to half-cycles without wobble inversions.

Abstract: A wobble-signal detecting device detects a wobble signal based on a signal which is the difference between outputs of two divisions of a light receiving device. These two divisions are located on both sides of a line parallel to a target portion of an information recording track. This light receiving device receives light reflected by a recording medium as a result of an optical beam being incident on the recording medium. This recording medium contains the information recording track, which wobbles at a predetermined frequency, and has pre-pits formed at predetermined intervals in areas between the information recording tracks.

Abstract: The optical disk recording apparatus of this invention includes: a first detection section for detecting a ID address cycle based on a timing of detection of an ID section of an optical disk; a second detection section for detecting a wobble cycle based on a wobble clock; and a state determination section for determining a state of the wobble clock based on the ID address cycle and the wobble cycle.

Abstract: A process of writing sector header data in the form of a stream of digital bits producing features located at varying radial positions on a master recording disk. Synchronized with rotation of the disk, a variable delay having a duration which varies with the radial positions of the bits on the disk is introduced into a clock signal. In the preferred embodiment, using the clock signal, a highly accurate, variable time delay is generated between the rotation of a master recording spindle and the recording of sector header data on a master disk mounted on the spindle. Thus, optical disks manufactured from the master disk have arc-shaped sector header spokes exhibiting maximum spatial accuracy and resultant maximal timing accuracy.

Abstract: An optical disk device that records and reproduces information on/from a recordable optical disk is provided.

Abstract: An optical recording medium for accurately deriving the address information or the disc rotation control information despite narrow track pitch and for recording signals to a high density, and a method and apparatus for recording and/or reproducing such optical recording medium. The optical recording medium has a wobbled groove and pits formed at a pre-set interval in an area between turns of the wobbled groove. The recording/reproducing method includes controlling rotation of the optical recording medium by a wobbled signal from the groove and detecting the position on the optical recording medium of a recording signal by pit signals detected from the pits. The recording/reproducing apparatus includes a detection device for detecting the wobbled signal from the groove and a detection device for detecting pit signals from the pits.

Abstract: An optical disc is described for recording data, which disc has a recording area subdivided in coaxial annular zones comprising circular or spiral tracks. Each track within one of the zones is arranged for storing a same predetermined amount of data, and the first track of each zone stores an amount of data proportional to the radial position, resulting on average in a substantially constant density, the so called CLV (Constant Linear Velocity) density. The tracks comprise periodic characteristics, e.g. a wobble, which are radially aligned within each one of the zones, the periodicity being indicative of the track recording density for the track concerned. Hence the data recording and reading speed can be synchronised to the periodic characteristics, whereas any cross-talk of the periodic characteristics of neighbouring tracks is avoided.

Abstract: A method and related circuit for synchronizing a writing clock with a wobble clock of a compact disk (CD) drive. The CD drive is capable of rotating a CD that has a data track for recording data and a wobble track. The CD drive is capable of generating the wobble clock according to movement of the wobble track while the CD is rotating. Also the CD drive is capable of writing data on the data track according to the writing clock. The method includes adjusting the frequency of the writing clock so as to synchronize the writing clock and the wobble clock.

Abstract: An optical disc is described for recording data, which disc has a recording area for recording data encoded in optical marks at a recording density. The recording area has circular or spiral tracks provided with a servopattern comprising headers alternating with track portions. The headers contain position information encoded in preformed marks. The track portions comprise periodic characteristics, e.g. a wobble, to synchronise the data writing and reading operations. For reliably detecting the headers the phase of the periodic characteristics comprises a phase jump at a predetermined distance before each header.

Abstract: A method and device for controlling a rotation speed of a spindle of an optical disk drive includes a frequency detector, two phase detectors, a frequency divider, a low pass filter, a switch circuit, and a drive circuit. The method uses a wobble signal, an encoder EFM frame synchronization (EEFS) signal, an encoder subcode frame synchronization (ESFS) signal, and other related signals to generate five control signals for controlling the rotation speed of a motor connected to the spindle of the optical disk drive. Using the five control signals, the method limits the phase difference between the Absolute Time in Pre-groove (ATIP) sync and the ESFS to be within a predetermined value, and thus improves an update rate and a writing efficiency.

Abstract: A tracking error signal generating apparatus having an inexpensive and simple configuration for a disc-shaped information recording medium driven in conformity with a given system, such as the CAV system, CLV system or ZCLV system, is provided.

Abstract: An apparatus which records/reproduces data with respect to an optical recording medium, includes a data processing unit which detects a phase difference between a phase reference signal and a groove wobble signal detected from the optical recording medium, and compensates for the phase difference and performs a signal processing to record data on or reproduce data from the optical recording medium in response to the phase difference being equal to or greater than a predetermined reference value. By detecting a phase difference between a phase reference signal and a wobble signal and compensating for the phase difference, a recording of data on and a reproducing of data from the optical recording medium can be more accurately performed.

Abstract: An optical recording medium for accurately deriving the address information or the disc rotation control information despite narrow track pitch and for recording signals to a high density, and a method and apparatus for recording and/or reproducing such optical recording medium. The optical recording medium has a wobbled groove and pits formed at a pre-set interval in an area between turns of the wobbled groove. The recording/reproducing method includes controlling rotation of the optical recording medium by a wobbled signal from the groove and detecting the position on the optical recording medium of a recording signal by pit signals detected from the pits. The recording/reproducing apparatus includes a detection device for detecting the wobbled signal from the groove and a detection device for detecting pit signals from the pits.

Abstract: A disk drive system comprises control circuitry and a disk device. The disk device transfers an analog signal representing servo data and user data from a disk device to the control circuitry. The servo data includes servo synch marks. The control circuitry processes the analog signal to generate a digital signal representing the user data. The control circuitry includes Viterbi circuitry and servo circuitry. The Viterbi circuitry interleaves and sums samples of the analog signal. The Viterbi circuitry then processes the sums using two states, an even magnet length constraint, a D=1 constraint, and a sliding threshold algorithm to generate a bit sequence. The servo circuitry processes the bit sequence to detect the servo synch marks.

Abstract: An optical disc is formed with a guiding groove from an inner periphery side toward an outer periphery side of the optical disc at constant groove width and constant groove intervals, and the optical disc can detect a predetermined frequency by forming a wobble on an end of the guiding groove. When the wobble is rotated at constant linear velocity, a plurality of constant frequencies are obtained with respect to a predetermined recording position of the guiding groove.

Abstract: An wobble signal detection circuit that is provided on an optical disk device and can detect a wobble signal having high accuracy and stability at least when recording information on an optical disk. This wobble signal detection circuit can be applied to plural types of optical recording media. With the wobble signal detection circuit, during a period for forming a space region, a first voltage signal provided from a first light receiving element is sampled and amplified to be a target voltage, a second voltage signal provided from a second light receiving element is sampled and amplified to be the target voltage. The difference between the two amplified signals are output as the wobble signal. The first and second light receiving elements are divided from each other in the direction tangential to a recording region on the optical recording medium.

Abstract: An apparatus for carrying out a fine servo control and a rough servo control with respect to the rotation of a motor for rotating a recording medium in accordance with information recorded on the recording medium. A fine servo signal is generated on the basis of a reproduction clock, filtered by a first filtering device, and used for the fine servo control. A rough servo signal is generated on the basis of a frame synchronizing signal, filtered by a second filtering device, and used for the rough servo control. The first filtering device has a first frequency band, and the second filtering device has a second frequency band. The upper limit of the second frequency band is lower than that of the first frequency band.

Abstract: In an optical disc recording method conducted by irradiating an optical beam for recording onto an optical disc to form pits on the lands thereof, when a recording speed is lower than a predetermined recording speed, the sampling/holding operation of a light receiving signal for detecting a wobble signal is performed during a power-off period of a recording signal. On the other hand, when the recording speed is higher than the predetermined recording speed, the sampling/holding operation is performed during a power-on period of the recording signal. Therefore, a wobble signal can be detected at all times at good C/N ratio independently of the speed recording.

Abstract: Servo control circuitry 300 includes a digital to analog converter 402 for converting digital servo control data into a pulse width modulated signal. A first conductor transmits the pulse width modulated signal to an external device 409. A second conductor transmits a reference signal derived from the clock signal to external device 409, external device 409 differentially receiving the pulse width modulated signal with respect to the reference signal.

Abstract: A disk reproducing device comprising: clock signal extracting means for extracting a regenerative clock signal from a reproduced signal; synchronization detecting means for detecting a synchronizing signal from the reproduced signal; extracted clock signal verification means for verifying that the regenerative clock signal is correctly extracted; signal processing means for performing variable linear velocity reproduction; target reproducing speed setting means for setting a target reproducing speed; reproducing speed verification means for verifying that a reproducing speed reaches the target reproducing speed; and signal processing start command generating means for outputting a signal processing start command referring outputs of said extracted clock signal verification means and said reproducing speed verification means.

Abstract: A control apparatus and method for controlling a velocity of a spindle motor included in an optical disk reproducing system to prevent a forward or backward overrun of a spindle motor are disclosed. A widest signal detector of the apparatus detects the widest pulse width of an eight-to-fourteen modulation (EFM) signal according to a main clock signal and generates a first status signal representing a status of the pulse width of the detected signal according to a frame clock signal, which is divided by a first predetermined number j. A narrowest signal detector of the apparatus generates a second status signal representing a status of the narrowest pulse width of the first status signals according to the frame clock signal divided by a second predetermined number k, where k is greater than j. An overrun controller increases or decreases or holds a previously counted result according to the frame clock signal divided by the second predetermined number and the second status signal.

Abstract: A receiving apparatus including a receiving circuit for receiving data synchronized with a predetermined clock signal; a data detection circuit, for detecting values of at least three bits of received data in a cycle defined by a period started from a desired position and corresponding to a cycle of the clock signal; and a selecting circuit for selecting from the received data with the detected values the received data with the least change of the value with respect to the received data of values detected immediately before and after substantially in each cycle and outputting the value of the received data.

Abstract: An optical recording medium for accurately deriving the address information or the disc rotation control information despite narrow track pitch and for recording signals to a high density, and a method and apparatus for recording and/or reproducing such optical recording medium. The optical recording medium has a wobbled groove and pits formed at a pre-set interval in an area between turns of the wobbled groove. The recording/reproducing method includes controlling rotation of the optical recording medium by a wobbled signal from the groove and detecting the position on the optical recording medium of a recording signal by pit signals detected from the pits. The recording/reproducing apparatus includes a detection device for detecting the wobbled signal from the groove and a detection device for detecting pit signals from the pits.

Abstract: An optical disc reproducing device (hereinafter referred to as a CD player) that reproduces a CD (Compact Disc) audio signal, and more particularly, an apparatus is provided, which is designed to accurately control the speed of a spindle motor by reflecting the gap between two points in a buffer where data is recorded and the recorded data is read respectively. The spindle motor speed control apparatus of the CD player which reproduces an audio signal using data reproduced by the disc and buffered on the buffer includes an EFM demodulator, a frequency error measurement unit, a buffer, a lead/lag detector and a motor control signal generator. The apparatus can dynamically control the speed at which data stored on the disc is read more easily and reliably by controlling the spindle motor speed.

Abstract: An optical recording medium for accurately deriving the address information or the disc rotation control information despite narrow track pitch and for recording signals to a high density, and a method and apparatus for recording and/or reproducing such optical recording medium. The optical recording medium has a wobbled groove and pits formed at a pre-set interval in an area between turns of the wobbled groove. The recording/reproducing method includes controlling rotation of the optical recording medium by a wobbled signal from the groove and detecting the position on the optical recording medium of a recording signal by pit signals detected from the pits. The recording/reproducing apparatus includes a detection device for detecting the wobbled signal from the groove and a detection device for detecting pit signals from the pits.

Abstract: Disclosed is a disk-like recording medium, a disk recording apparatus and a disk recording method, and a disk playback apparatus and a disk playback method. Disk ID is recorded over a circle of a burst cutting area on an optical disk. The circle is divided into n blocks, each of the blocks is divided into m frames, and ID information is recorded in each of the frames with k channel bits.

Abstract: Disclosed is a disk-like recording medium, a disk recording apparatus and a disk recording method, and a disk playback apparatus and a disk playback method. Disk ID is recorded over a circle of a burst cutting area on an optical disk. The circle is divided into n blocks, each of the blocks is divided into m frames, and ID information is recorded in each of the frames with k channel bits.

Abstract: An rotation speed controlling apparatus of an optical recording medium having a wobbled track includes an optical pickup for irradiating a light beam to generate a reading signal according to a wobbling shape of the track; a filter having a predetermined frequency band to pass a wobble reference frequency therethrough for extracting a wobble signal from the reading signal; a generator for generating a wobble reference signal; a detector for detecting the difference between the wobble signal frequency and the wobble reference frequency; a controller for controlling the rotation speed on the basis of the difference between the frequency of the extracted wobble signal and the wobble reference frequency; and a discriminator for discriminating that the wobble signal frequency lies outside the frequency band of the filter; wherein the controller controls the rotation speed in accordance with the detected frequency difference when the wobble signal frequency lies outside the frequency band of the filter.

Abstract: An optical disc record carrier having at least one wobbled groove that permits information recording on both groove and land tracks is provided. Each groove has a sync wobbling modulated with a continuous signal and an address wobbling. The address wobbling includes an address portion including address information of each sector. The address portion comprising presence of a first predetermined number of wobbles and absence of a second predetermined number of wobbles. The presence and absence correspond to respective logical values of binary system. The grooves and lands are substantially the same in width throughout and wobble in phase.

Abstract: An optical recording medium for accurately deriving the address information or the disc rotation control information despite narrow track pitch and for recording signals to a high density, and a method and apparatus for recording and/or reproducing such optical recording medium. The optical recording medium has a wobbled groove and pits formed at a pre-set interval in an area between turns of the wobbled groove. The recording/reproducing method includes controlling rotation of the optical recording medium by a wobbled signal from the groove and detecting the position on the optical recording medium of a recording signal by pit signals detected from the pits. The recording/reproducing apparatus includes a detection device for detecting the wobbled signal from the groove and a detection device for detecting pit signals from the pits.

Abstract: This invention directs to an optical disc assembly configured to receive an analyte which can be detected by a standard optical disc reader or an optical disc reader modified therefrom. The optical disc assembly may preferably be designed so that the optical disc reader can track the disc and detect the analyte concurrently and discriminably. The optical disc assembly contains or encodes optically readable features which are trackable by the optical disc reader and which have encoded speed information enabling the optical disc reader to rotate the optical disc assembly at a determinable speed. The optical disc assembly also includes an analyte section capable of receiving the analyte that can be detected by the optical disc reader.

Abstract: In a wobble-format type optical recording medium 10 involving a guide groove 11 wherein the guide groove is allowed to meander over substantially the whole length thereof to form wobble, and wobbled intermittent sections 12 where there are no meandrous area are placed at predetermined positions in the wobble; a first wobbled intermittent section 12a for determining reference position is disposed at at least one reference position A in the optical recording medium, and furthermore, a second wobbled intermittent section 12b is disposed selectively at each predetermined position B apart from each reference position by a predetermined distance.

Abstract: An interface circuit that is suitable for use in a recording system and a system for manufacturing optical disks, which is provided with this interface circuit, have an analog-side interface circuit 100A and a digital-side interface circuit 100B, these interface circuits being optically linked, either acoustically, or electromagnetically, so as to enable mutual transmitting and receiving of a digital signal therebetween. The interface circuits 100A and 100B, which serve as a receiving side with respect to the other sides, detect the logic of the digital signal with a timing that does not include the jitter component that is included in the transmitted digital signal, the detected digital signal logic being used as the basis for generating a new digital signal.

Abstract: An optical disc is described for recording data, which disc has a recording area for recording data encoded in optical marks at a recording density. The recording area has circular or spiral tracks provided with a servopattern comprising headers alternating with track portions. The headers contain position information encoded in preformed marks. The track portions comprise periodic characteristics, e.g. a wobble, to synchronise the data writing and reading operations. For reliably detecting the headers the phase of the periodic characteristics comprises a phase jump at a predetermined distance before each header.

Abstract: A device has a first operational state for writing information onto a record carrier and a second operational state for reading information from a record carrier. The device includes a phase-locked loop for generating a clock signal from a reference signal and a control unit for generating a pulsed transducer control signal in response to an information signal and the clock signal. The device also includes a generating transducer for generating physically detectable patterns in the record carrier in response to the transducer control signal and a read transducer for generating a read signal in response to physically detectable patterns in the record carrier in the second operational state that includes a radiation source. The device further includes a power supply which supplies the radiation source with an electric power. The phase-locked loop includes a memory for memorizing, in the first operational state, a memory value which is a measure of the supplied clock signal.

Abstract: An optical disk device that records and reproduces information on/from a recordable optical disk is provided.