36 results about "Cd recording" patented technology

The present invention provides a CD recording device. In data recording, a laser output pulse is measured and a write strategy phase setting is corrected and recorded so as to output a pulse with a correct phase. While laser is emitting a constant power in a laser control system, a write strategy phase setting is changed. A multi-pulse emitted light as a laser mark portion is voltage-converted by a photo-detector and averaged by an LPF. Temporal change with respect to the phase setting is measured / detected by a voltage level and the phase setting of the write strategy generation circuit is corrected / updated so that the measurement level is an ideal level.

The invention provides a parameter method and device of stencil-CD, which comprises the following steps: First, setting an initial parameter of stencil-CD; second, testing the stencil-CD method of the relative parameters according to experimental design; finally, selecting the optimum parameter and the relation of stencil-CD quality according to the stencil-CD test results.

The invention discloses a monitoring and alarming method for safe recording of an optical disc. In the method of the present invention, firstly, the applicant logs in the CD recording client, submits the application for CD recording, and uploads the files to be recorded to the intranet server for approval; then, after the approval, the recording device performs the actual CD recording, and after the recording is completed, the CD is automatically stored in the CD-ROM safety cabinet, the applicant can only take the CD-ROM after passing the authentication of the applicant’s identity information. When the user uses a confidential CD-ROM on other computer terminals, he must first run a dedicated CD-ROM monitoring and browsing tool to check whether the use environment is safe and prevent illegal use of the CD-ROM , when the disc is used up, insert it into the disc recycling box for recycling. The invention better controls the behavior of recording the optical disc, ensures the security of secret-related files, effectively supervises the use of the optical disc, prevents the illegal use of the optical disc in time, and prevents the leakage of secrets during the use of the optical disc.

In apparatus for recording on a compact disc (1), sub-data strings are recorded so that the main data strings are reproducible by an optical pickup (13) for reproducing the main data strings, and the main data strings are protected from being copied illegally without any adverse effect on reproduction of the pit-and-land main data strings. The sub-data string (ED) is recorded by locally changing the reflectance of the reflection film in the form of irregularities such as pits or marks at a timing which does not affect the position information of the edge.

The invention relates to a method for realizing real-time CD recording in a digital video recorder, comprising the steps of: (1) the establishing process of a data buffer; (2) the process of writing video data files in the buffer: 21) searching for the initialized buffer files in subsection when a certain branch in a path Q needs to start real-time recording, initializing next buffer file and covering the first buffer file when all the buffer files are used up; 22) writing the video and audio data stream compressed in the branch in the data file found in the step 21) according to file serial number; (23) executing the process of reading the video data in CD when the video time reaches T minute and simultaneously, switching from the path Q to the step 21) for continuing the read-in processof buffer data files; and (3) the process of writing video data files in CD. The invention has the beneficial effects of ensuring the fast availability of recorded CD at the end of the whole process as the data is recorded to the CD in the video process.

The invention relates to a CD recording mainly in the audio signal that can simple replay by the user, and enable real-time management becomes simple. Its format doesn't include VTS but only form by ATS, which comprises the Audio Management (AMG), the audio management menu (AMGM) of audio video and audio and ATS1 managed by the AMGI of AMG.

In using an optical disc such as a digital versatile disc (DVD), if a track jump occurs, it is sometimes desirable to detect the track jump as soon as possible after it occurs. The optical disc format includes a pre-groove track structure which provides frames in which data can be written to or read from the disc. The structure of the pre-groove track is designed to detect the possible occurrence of an inadvertent track jump as quickly as possible and in a time shorter than that required to detect a track jump using only disc addressing data. The pre-groove track structure can be adjusted to enhance track jump detection, such as by position coding in the data line segment of the track, or a coding scheme for the period of addressing data dibits.

An optical disk apparatus for recording information of copyright on an optical disk where desired data are recorded by repetition of pits or marks. The apparatus comprises a recording means for recording the copyright information by irradiating a laser beam onto the optical disk in such a manner as to repeatedly form, in a predetermined area of the optical disk, local regions which cause greater changes in the return-light receiving result as compared with the pits or marks. On the optical disk, the existence ratio of the local regions for recording the copyright information is set to be less than 0.3 in the circumferential direction of the disk. In a reproduction mode, the copyright information recorded like a bar code for example can be exactly reproduced with certainty.

An optical disc recording / reproduction apparatus for recording and / or reproducing a data by applying a beam from an optical head unit through a substrate onto / from a recording layer of the optical disc through, wherein the substrate of the optical disc is 0.3 mm or below; the optical head unit comprises: an objective lens for converging an incident beam and emitting the beam toward the optical disc; a forward lens for converging the beam introduced through the objective lens and applying the beam to the optical disc; a lens holder where the objective lens and the forward lens are fixed; and an actuator for driving the objective lens and the forward lens as a unitary block and controlling at least focusing, the objective lens and the forward lens having a total numerical aperture of 0.8 or above.

The present invention relates to a high-density disk that is structured to prevent a collision of an optical pickup's objective lens with the high-density disk if the disk is placed upside down in a disk device that is able to record and reproduce signals to / from the high-density disk. A high-density disk recording medium according to the present invention is structured such that, wherein a recording layer having high-density pit patterns is offset from a center plane of disk thickness, a center hole of the disk recording medium is asymmetric in shape with respect to the center plane where, for example, both entrances of the center hole have mutually different diameters.