Abstract: An automatic playback overshoot correction system predicts the position in the program material where the user expects to be when the user stops the fast forward progression of the program material. The system determines the position where the program material was stopped and transitions to the new mode that the user selected, starting at the stopped position with an overshoot correction factor subtracted from it. The system uses a prediction method to correctly place the user within the program upon transition out of fast forward mode and determines if the speed of the fast forward mode and then automatically subtracts a time multiple to the frame where the transition was detected and positions the user at the correct frame. The time multiple is fine tuned if the user is consistently correcting after the fast forward mode stops.

Abstract: A method of driving an optical disc and an optical disc drive using the method is provided. The method includes rotating an optical disc by a spindle motor, transferring an optical pickup positioned to correspond to the optical disc by driving a sled motor, and decreasing a current supplied to the spindle motor while driving the sled motor.

Abstract: Reproduction of digital data using a fallback mechanism is disclosed. The digital data can be reproduced in a first mode and in an at least second mode, the operability of a selected mode is monitored and in a situation of failure, a switching between the mode in which a failure is detected to a mode which is operable can be made, so that least some functionality is ensured. An apparatus is disclosed, the apparatus being operable in a first mode where the digital data is accessed in a first format, and the apparatus being operable in an at least second mode where the digital data is accessed in at least a second format. Also a system, a method, a computer readable code and a data stream are disclosed.

Abstract: In one embodiment the present invention includes a circuit comprising a switch and a switch driver. The switch is configured to provide synchronous rectification switching of a back-EMF voltage. The synchronous rectification switching produces a source voltage. The switch driver is configured to receive the back-EMF voltage and the source voltage. The switch driver provides a control signal to a control terminal of the switch. The control signal has a frequency. The frequency is used to control an amount of the synchronous rectification switching. Accordingly, the frequency reduces a dissipated power associated with the synchronous rectification switching.

Abstract: A method and an apparatus for controlling data access rate of an optical disc player are disclosed. The method includes steps of (1) utilizing a micro-controller to decide whether an action of an instruction of a predetermined data processing is an extraction operation or a play operation; (2) driving the spindle motor and a pick-up head to retrieve data from an optical disc at a first data access rate by the micro-controller while the action of the instruction of the predetermined data processing is an extraction operation; and (3) driving the spindle speed and the pick-up head to retrieve data from the optical disc at a second data access rate which is less than the first data access rate by the micro-controller while the action of the instruction of the predetermined data processing is a play operation.

Abstract: When an optical disk player is switched on, a controller obtains information of a sampling frequency or sampling frequencies that are supported by an appliance that is connected to the optical disc player through an HDMI cable. Then, when a playing start command is input, it is judged whether the connected appliance supports the audio output or not. When the connected appliance supports the audio output, and the sampling frequency of a sound source is larger than the sampling frequency or frequencies that the connected appliance supports, the audio signals are down-sampled to fit the connected appliance. Output of the audio signals is then started.

Abstract: To provide an optical disk device, an optical disk control method and an integrated circuit, which are capable of writing a recordable mark by changing the reflectance ratio of a reflective film formed on concave-convex pits without using an industrial special device or a high-power laser light source. A data reproduction controller (103) sets a first rotation speed in a disk rotation speed switching unit (108) and a first laser power in a laser power switching unit (107) when reproducing the concave-convex pits. When writing the recordable mark, a mark recording controller (104) sets in the disk rotation speed switching unit (108) a second rotation speed that is slower than the first rotation speed and the lowest rotation speed at which the concave-convex pits can be reproduced, and sets a second laser power greater than the first laser power in the laser power switching unit (107) in accordance with the emission timing.

Abstract: An optical disc reproducing apparatus includes: a decode processing circuit configured to generate decoded data by decoding encoded data read out from an optical disc such that the decoded data is written into a buffer memory, and to output a write signal to indicate a data rate when the decoded data is written in the buffer memory. A data processing circuit converts the decoded data read out from the buffer memory into an output data, and outputs a read signal to indicate a data rate when the decoded data is read out from the buffer memory. An optical disc rotation control circuit controls a number of rotations of the optical disc based on the write signal and the read signal.

Abstract: A recording apparatus includes: a first strategy calculating device (SCD) for calculating a first optimum strategy allowing jitter recorded at a first speed to satisfy a desired condition by adjusting a first standard strategy; a second SCD for calculating a second standard strategy at a second speed by performing clock cycle conversion according to a difference between the first and second speeds on the first standard strategy; a second power calculating device for calculating a second optimum power used at the second speed; a third SCD for calculating a second optimum strategy allowing jitter recorded at the second speed to satisfy a desired condition, by adjusting the second standard strategy; and a fourth SCD for calculating a third optimum strategy at a third speed, based on each of a difference between the first standard and optimum strategies and a difference between the second standard and optimum strategies.

Abstract: A disc recording device has a mode control unit for switching the device either to a read mode or to a write mode. Reading and writing can be alternated for simultaneous recording and reproducing of video. A rotation speed control unit sets the rotation speed of the record carrier, and has a speed selector for selecting one of at least two speed settings for the read mode in dependence on an actual rotation speed of the record carrier during the write mode when switching from write mode to read mode. By setting the read speed to one of a limited number of settings the difference in rotation speed between said actual rotation speed and the speed in the read mode is limited. Due to the limited differences power dissipation is limited, while the performance of access time and playability of real-life discs is at a high level.

Abstract: An access method for use when switching from recording into an optical disk to reproduction from the optical disk or vice versa is disclosed that comprises a step of calculating a rotating speed n2 of a motor for rotating the optical disk given that linear velocities in a first access position before the switching and a second access position after the switching are equal, a step of determining whether n2 satisfies a pair of expressions n2>n0 and n2>n1 or a pair of expressions n2<n0 and n2<n1 where n0 and n1 are rotating speeds of the motor before and after the switching, a step of changing a control mode from CLV to CAV and the rotating speed from n0 to n1 if one of the pairs of expressions is satisfied, and a step of shifting a position to be accessed from the first access position to the second access position.

Abstract: Embodiments of method and apparatus for controlling a data read speed of an optical disc can reproduce data with greater accuracy. An embodiment of a method for controlling data read speed can determine whether the optical disc is finalized or in an open state, and a playback speed can be controlled by the determined result. If the optical disc is in an open state, a data-recorded section can be divided into at least two areas, and different speeds are applied to individual areas. If the optical disc is finalized, a relatively high speed or maximum speed is applied to all areas of the optical disc. Therefore, data of an unfinalized open-state disc can be reproduced at high speed. Further, increased resistance to surface vibration, eccentricity, or defects of the optical disc can be achieved.

Abstract: An optical disk device for recording data in an optical disk under ZCLV control is provided. The optical disk device divides the optical disk into a plurality of zones, and drives said optical disk at a linear velocity fixed in each zone but varied among the zones. At least one of the linear velocity and the number of zones of the optical disk is controlled in accordance with the amount of data to be recorded. Data recording time is reduced by dynamically changing at least one of the linear velocity and the number of zones of the optical disk in accordance with the amount of data to be recorded, rather than fixing the number of zones and the linear velocity thereof.

Abstract: An operation for recording a recording signal onto a disk (1) is interrupted, when an amount of signal data stored in a buffer RAM (11) for temporarily storing the recording signal is less than an interruption setting value during performing of the recording operation. Moreover, when the amount of signal data stored in the buffer RAM (11) increases and indicates a resumption setting value, the signal recorded on the disk (1) before interruption is reproduced, and the recording operation is resumed based on the reproduced signal. Moreover, recording properties are detected by the signal reproduced before resumption of recording.

Abstract: A discontinuous position detecting device for detecting a discontinuous position at which date and time information indicative of date and time of recording on a recording medium is discontinuous, the discontinuous position detecting unit including, a scanning unit that scans the recording medium in a first direction and in a second direction that is different from the first direction, a first detecting unit that detects a temporary discontinuous position located in a vicinity of the actual discontinuous position while the scanning unit scans the recording medium in the first direction, a second detecting unit that detects the actual discontinuous position while the scanning unit scans the recording medium in the second direction, and a scan controller that controls the scanning unit to scan the recording medium at a first scan speed except while the second detecting unit detects the actual discontinuous position, and to scan the recording medium at a second scan speed while the second detecting unit detects

Abstract: An optical disc device records data on an optical disc by projecting a laser beam on the optical disc such that a linear density of the data becomes substantially constant. The optical disc device comprises velocity judging means, velocity changing means, recording velocity detecting means, and recording velocity transmitting means. The velocity judging means is for judging a recordable velocity for an optical recording medium inserted into the optical disc device. The velocity changing means is for changing a recording velocity designated from a host. The recording velocity detecting means is for detecting the recording velocity during a recording. The recording velocity transmitting means is for transmitting information concerning the detected recording velocity to the host.

Abstract: The present invention provides an optical disk reproducing apparatus capable of providing special reproducing (replay) mode using a jog dial in a manner similar to the special reproduction using an analog record player such as scratching etc. When the operation disk is rotating at a same predetermined speed as the rotation speed of the disk, the normal reproducing (replay) is performed. The special reproducing (replay) such as scratching is performed when the operation disk is turned, and the turning speed and direction of the operation disk are detected.

Abstract: The information medium of the present invention is provided with a lead-in region and a data region in which information signals can be recorded, wherein the lead-in region has a recordable portion in which information signals can be recorded. An identifier I1 specifying a recording speed that can be adopted when recording information signals to the data region is provided in the recordable portion of the lead-in region, increasing the precision with which the recording speed is specified.

Abstract: 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 velocity, a disc motor 16 for rotating the information disc 2, a digital signal processing means 7 for digitizing data according to the playback format of the information disc 2, an interface means 19 for transmitting the digitized data to an external device and a buffer memory 18 for temporarily containing the data, and further includes a means for detecting the linear velocity and track pitch of the information disc 2 to decide the reference value for the velocity control of the disc motor 16 on the basis of the detected values of the linear velocity and track pitch and the value of the maximum radius of the data record area. According to the so-constructed disc playback system, the maximum playback velocity of the system can be obtained even in the case of discs having different track pitches.

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: Reproducing method and apparatus for reproducing highly efficiently encoded data from a record medium composed of spectrum data and scale factor data determines if address of changed highly efficient encoded data and stores it. The method and apparatus determines whether or not the address of highly efficient encoded data whose scale factor data is changed corresponding to the operating mechanism and stores it in a memory store apart from the write address by a predetermined distance. By partly changing the scale factor values and filtering process is accomplished.

Abstract: A user-interactive program assists a user in locating files on optical media discs such as CD-ROMs and DVDs to enhance file-transfer rates and program installation times in computers with a Constant Angular Velocity (CAV) optical media disc drive. In addition, an application program calculates an optimal location for files and/or directories on an optical media disc so that the files are located near the location with the highest data transfer rate. This program may be used to compute an image file that defines where data will be located on an optical disc, or may be used to control transfer of data to the optical media disc.

Abstract: Optimum power control also known as OPC is performed while changing a recording speed and a recording laser power level. Signal recorded through the optimum power control is reproduced for measurement of reproduced signal quality. Recording speed achieving a recording laser power level that can provide reproduced signal quality falling within a predetermined acceptable range is displayed as a recommendable recording speed so that a user can set the displayed speed as a recording speed for use in actual recording.

Abstract: This invention provides method and apparatus for controlling a reproduction speed of an optical disk, which detects the condition of an optical disk and changes the reproduction speed automatically to a pre-determined speed corresponding to the detected disk condition. The method according to this invention comprises the steps of detecting the condition of an optical disk through the characteristics of an RF signal reproduced from the optical disk; adjusting the reproduction speed of the optical disk to a pre-determined speed appropriate for the detected disk condition.