摘要:
Information file recording method and apparatus are devised to have high recording efficiency. In parallel with the recording of an information file on a recording medium, file management data relating to the information file is once recorded in a memory. The file management data is retrieved from the memory and recorded in a predetermined area of the recording medium.
摘要:
A rotation control apparatus which can maintain an accurate rotating state even in a high density optical disk (DVD) having a structure such that parts of the sync signal are recorded at an interval different from that of the other sync signal parts. The apparatus has: a unit period signal generator for generating a period signal of a unit period; a pre-pit detector for detecting a pre-pit from the DVD; a phase difference detector for detecting a phase difference between the detection timing of the pre-pit and the unit period signal; and a holding circuit for holding the phase difference detected. The rotation of the DVD is controlled on the basis of the phase difference held at the holding circuit.
摘要:
A pattern input apparatus designed to improve the operational easiness comprises a plurality of contact detecting device, arranged on a detection surface, each for generating a detection signal upon contact with an object. A pattern drawn by the object moving in contact with the detection surface is discriminated, using the locus or the amount of displacement vector of a point located approximately at the center between at least two adjoining ones of the plurality of contact detecting devices on the detection surface, when the detection signals are output from the at least two adjoining ones of the plurality of contact detecting devices.
摘要:
By the control information recording method, control information to control at least one of recording and reproducing operations of record information on an information record medium is recorded onto a guide track of the information record medium. The control information recording method is provided with the steps of: generating a control information timing signal one after another at an interval corresponding to a length of a control information unit equal to an N (N: predetermined integer not less than 2) multiple of a length of a record information unit of the record information; and recording the control information onto the guide track of the information record medium, on the basis of a timing corresponding to the control information timing signal.
摘要:
An information recording apparatus includes: a unit for applying a predetermined processing to record information divided into error correction units and generating processed record information including a plurality of record units; and a unit for recording the processed record information on an information record medium; a unit for recording, after the recording of the processed record information, predetermined dummy information of an information amount corresponding for the plurality of record units, on the information record medium, subsequent to the processed record information recorded.
摘要:
On an optical disc, a record mark having a variable length according to pit data DP is formed at a displaced position to which the record mark is displaced, in a direction crossing the reading direction thereof, according to a wobble signal WB obtained by modulating wobble data DW in a predetermined modulating method. A second wobble synchronization signal D-SYNCw, as a dummy, is recorded on the optical disc, away from the start position of the wobble data DW.
摘要:
On a disc master DS, a record mark having a variable length according to the first data is formed at a displaced position to which the record mark is displaced, in a direction crossing the reading direction thereof, according to a wobble signal obtained by modulating the second data in a predetermined modulating method. The original data is recorded in such a manner that the original data is divided into the first data and the second data.
摘要:
A rotation control apparatus which can maintain an accurate rotating state even in a high density optical disk (DVD) having a structure such that parts of the sync signal are recorded at an interval different from that of the other sync signal parts. The apparatus has: a unit period signal generator for generating a period signal of a unit period; a pre-pit detector for detecting a pre-pit from the DVD; a phase difference detector for detecting a phase difference between the detection timing of the pre-pit and the unit period signal; and a holding circuit for holding the phase difference detected. The rotation of the DVD is controlled on the basis of the phase difference held at the holding circuit.
摘要:
A system comprising a recording apparatus for recording record information onto a recording medium and a reproducing apparatus for reading the record information from the recording medium and outputting it to reproduce, is provided. The record information includes: image information; a first identification information which represents any one of never copy, one copy and copy free; and a second identification information which represents either the never copy or the one copy. The never copy indicates copying is prohibited. The one copy indicates copying is once permitted. The copy free indicates copying is permitted. The recording apparatus controls recording the record information, and determines whether or not the record information is to be encrypted based upon the first identification information and the second identification information. The reproducing apparatus controls outputting the record information based upon the first identification information and whether the record information has been encrypted or not.
摘要:
An apparatus for recording first information onto a recording medium, successively to second information that has been already recorded on the recording medium is provided. The first and second information are divided into a plurality of blocks. Each block includes a synchronization signal. This signal is located at a predetermined position in each block. A plurality of pre-pits are pre-formed on the recording medium at intervals of the predetermined length or an integer times the predetermined length. A reference signal with a predetermined frequency is pre-recorded on the recording medium. The apparatus has: a write clock signal generating device for generating a write clock signal on the basis of the reference signal; a pre-pit detecting device for detecting the pre-pits and outputting a pre-pit signal at a first timing, which is equal to a timing that each pre-pit is detected; a synchronization signal generating device for generating the synchronization signal and outputting the synchronization signal at a second timing synchronized with the write clock signal, and which is set so as to place the synchronization signal at the predetermined position in each block; a time relationship detecting device for detecting a time relationship between the pre-pit signal and the synchronization signal; a shifting device for shifting a phase of the write clock signal so as to make the detected time relationship equal to a predetermined time relationship; and a recording device for recording the first information and the synchronization signal onto the recording medium in accordance with the second timing.