Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Wataru Masuda

Masatsugu Tanji

Shinji Kubota

Hironori Masuda

Takafumi Sugano

Shigeo Shimada

Nobuyuki Ogawa

Hiromi Nakase

Hideaki Inoue

Yoshimitsu Nakamura

Hideto Kobayashi

Shunji Kagamibashi

Kiyoshi Tominaga

Haruhiko Tada

Atsuo Tsuji

Yuko Yamahara

Yasunobu Matsuo

Shoji Hagihara

In an information signal editing device, when a user specifies a desired reproduction section or reproduction start position, a management information file recorded in a memory is rewritten into a second management information file which is created on the basis of the specified information, and a second information file is set on the basis of the second management information file. The information signal editing device constructed as described performs arbitrary virtual editing when a DVD-RAM disk is non-rewritable, whereby the user can obtain a desired reproduction signal.

Information signal edition apparatus, information signal edition method, and information edition program

An optical disk device comprises a power ratio setting circuit for setting ratio of recording power to erasing power in a predetermined ratio, a recording start point detection circuit for detecting a recording start point by performing at least two cycle recording over the same area in a predetermined test region to detect a recording power and an erasing power of the recording start point, and a power setting circuit for setting a final recording power and erasing power for recording in a user region of the optical disk by multiplying the recording power and the erasing power of the recording start point by predetermined values respectively.

Optical disk device and method for setting recording power and erasing

Simultaneous recording on and playback from both sides of a double sided disk is achieved Sector addresses on both sides of the disk are read by respective scanners. One of address is renumbered according to a preset conversion rule which minimizes a time difference between instructions (for recording and playback on both disk sides) to be output to respective modems. Recording and playback operation are controlled according to the renumbered sector address.

Apparatus for recording on and playback from both sides of a disk shaped

A method of simultaneous recording on and playback from both sides of a double sided disk in which sector addresses on both sides are read by scanners, one of them is renumbered according to a conversion rule determined to minimize a time difference between instructions for recording and playback on both sides to be output to modems and recording and playback operation is controlled according to the renumbered sector address.

Method for simultaneous recording and playback from both sides of a

An optical recording and reproducing apparatus records the audio and video signals to an optical disk by dividing the audio and video signals for one frame into top and bottom audio and video signal components. The top and bottom audio signal component are recorded to a predetermined track on disk sides A and B referenced to the rotation position detection information preformatted thereon, respectively. A mode set panel produces a mode signal for switching the operating mode. A mode determiner produces the head operation mode signal for determining the operating mode of the optical heads based on the signal. Top and bottom heads record and reproduce audio and video signals to or from the two sides A and B, respectively. Top and bottom vertical synchronization mark generators produce the vertical synchronization marks from the sector of the optical disk preformatted for recording and reproducing audio and video signals. Head actuators drive the pickup. The top head operating mode determiner, to which the operating mode data and the vertical synchronization mark signal are input, determines the operating mode of the top optical head. The bottom head mode determiner, to which the operating mode data and the bottom vertical synchronization mark signal are input, determines the operating mode of the bottom optical head.

Optical recording and reproducing apparatus having discrete optical

A method and an apparatus having a memory device for recording a time-varying image in an optical information record medium having an address of a code track corresponding to the image and reproducing the image therefrom, includes the steps of storing data into the memory device of the relationship between the address of the code track and an address of a time code in correspondence with the image, inputting the address of the time code in correspondence with the image to be recorded or reproduced, converting the inputted address of the time code into the address of the code track based on the data stored in the storing step, and accessing to the medium based on the address of the code track obtained by the converting step to record or reproduce the image in correspondence with the inputted address of the time code.

Method and apparatus for recording and reproducing a time-varying image

A write laser power setting device for setting a write laser power for writing data on a recording medium, includes first and second oscillators and for producing carrier signals having high frequencies f1 and f2. The carrier signals are added with each other to produce a sum signal which is applied to a laser driver for producing a laser drive signal. The power of the laser drive signal is changed to various levels. Using the laser drive signal, the write/read head writes test signals at preselected areas on the recording medium such that different writing power levels are applied to different preselected areas, respectively. After writing the test signals, the write/read head reads the recorded test signals. From the read signal, an unwanted signal having a frequency f1-f2 is filtered, and the level of the unwanted signal is detected and stored. A minimum level of the stored levels is selected, and a preselected area at which the minimum level reading is obtained is detected. Then, the writing laser power is set at a writing power level corresponding to the level used for writing the test signal in the detected preselected area.

Write laser power setting responsive to a series of written test signals

An apparatus is provided for recording and/or reproducing video information and code data simultaneously on a video disc recording medium. The video information is recorded on the recording medium as FM-modulated carrier signals. The recording of such FM-modulated carrier signals is intermittently interrupted to record the code data. The interrupted or unrecorded portions of the otherwise recorded FM-modulated carrier signals is utilized to represent the video disc code data.

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Hirakata, Japan

Wataru Masuda