Thomson-csf

Thomson-brandt

Thomson-csf Telephone

Le Materiel Telephonique Thomson-csf

Eduvision (societe Anonyme)

Georges J Broussaud

Claude Tinet

Erich Spitz

Pierre Oprandi

Sylvain Kretschmer

Jean-Pierre Lacotte

Jean Paul Peltier

Pierre Aigrain

Bahman Nabati

A method of storing high resolution images on a videodisk in which signals associated with partial images are stored on successive disk tracks, the partial images making up the high resolution images. The partial images have a horizontal overlap of one point per line, which points are subsequently eliminated during the process of reconstructing the high resolution image. An encoder and decoder for effecting the above process is also disclosed.

Process of storage of high resolution images on video disks encoder and

The invention provides a process for manufacturing optical disks by pressing and disks obtained by such a process, for improving the inherent flatness of the optical disk of the thick type, obtained by a process of pressing between a recorded master and another master, recorded or not depending on whether it is a question of a single or double side disk, this latter being formed from a stack of at least two thin sheets of thermoformable material subjected to a pressure-temperature cycle after which bonding together of the sheets and duplication of the information from the masters for information recording are obtained.

Process for manufacturing optical disks by pressing

The switching device includes an array (1) with space-division switching by directional couplers without signal memorization, directional couplers (2.sub.1, . . . 2.sub.r), detectors (3.sub.1, . . . 3.sub.r) and receivers (4.sub.1, . . . 4.sub.r) connected to a processor which controls the switching of the couplers of the array (1) via an interface circuit (6). The processor reinserts in the output channels switching control signals and synchronization signals via converters (8.sub.1, . . . 8.sub.s) and couplers (7.sub.1, . . . 7.sub.s).

Process for switching time-multiplexed signals transmitted on a carrier,

An optical switching system comprising two optical fiber arrays 4 and 5 facing one another. In the space between these two arrays, a propagation mode converter 6 or 7, deflector 9 or 11, a deflector control device 13 or 14 and control logic 15 or 16 controlled by a processor 19 are placed for each fiber.

Optical switch for a very large number of channels

An apparatus in which the video disk frames are reread while a shutter blocks the film in order to have during the rereading operation the time necessary for advancing the kinescope film without causing violent mechanical stresses. In order to pass from the television standard with 30 frames per second to the cinematographic standard of 24 frames per second, one frame out of five is not recorded on the film and the film advanced without any rereading.

Apparatus for the transcription of a video disk onto a cenefilm

The present invention relates to methods for protecting against drop-outs in a sound signal recorded on a video-disc. It consists in recording onto a video-disc the same sound signal through the sub-carriers with a constant delay from one to the other. On reading out this video-disc, the two sub-carriers are restored to synchronism and the sub-carrier not altered is chosen for playing the sound signal.

Method for protecting against drop-outs in a sound signal recorded on a

A method and apparatus for displaying a picture film via a video-disc which consists in analyzing the pictures of the film on a plurality of interlaced fields which are successively recorded onto a video-disc. These fields are then read simultaneously on this video-disc and the video signal thus obtained are used for modulating a display apparatus scanned according to a primary raster with a superimposed raster. A coding device is used for mixing the video signals and producing signals for synchronizing the display apparatus.

Method and device for displaying a picture film via a video-disc

A display device for producing polychromatic luminous images comprising a display panel containing gas cells, electrodes for ionization of the gas, and a photoconductive layer located between the electrodes and responsive to a scanning invisible radiating beam. Each cell further comprises luminophore emitting primary visible radiations at the time of ionization of the gas, the ionization being effected by rendering the photoconductive layer locally conductive.

Growing community of inventors

Colombes, France

Georges J Broussaud