Mcdonnell Douglas Corporation

Atlantic Richfield Company

Videonics of Hawaii, Inc.

Jonathan A Jerome

Frank D Neu

Peter G Wohlmut

Geoffrey T Faraghan

A system and apparatus is disclosed for retrieving analog or digital information stored on an optically sensed disc. In a preferred embodiment, a video disc is disposed between a flooding light source and a matrix array of photosensitive elements, there being provided optical focusing means so that the illuminated data tracks of the video disc are imaged onto the photosensitive array. Circuitry is provided for sensing output signals from selected elements of the array and in response thereto selecting those elements of the array onto which the selected track (or tracks) is best imaged. In this manner the apparatus of the present invention can provide data track following, conventional data retrieval and parallel simultaneous and sequential data retrieval. Alternative circuitry provides signal stream manipulation to compensate for fluctuations in rotational velocity of the data disc and to provide improved signal-to-noise ratios as well as frequency response enhancement. Other alternative circuitry permits compensation for lost data.

Information retrieval system and apparatus

TV playback apparatus and method for a record having track sets comprising video track analogs and a plurality of audio track analogs disposed between the video tracks. All tracks in a respective track set are sensed for playback by a movable reading head incorporating a combination of video and audio sensing elements and including tracking of homing elements flanking the video reading element. A track set switching signal is sensed from the audio signal by an audio reading element for a controller means which very quickly slews the reading head to roughly position the video reading element for next video track. Such video track is sensed by any reading element in the reading head and determined through a multiplexer and controller means. Reading head is further stepped as necessary until video track sensing element is reading video track as controller receives video signal through band pass filter video sensing element. Position adjustment further made by controller, only as necessary, responsive to respective signals by tracking elements. The entire switching cycle from one video track to next is completed in substantially less time than attainable by any previously known prior art method or apparatus.

Video track transfer system and method

System, method and record medium for the reproduction of pictures and related audio information on a television receiver or monitor. Video information for discrete frames of the picture is recorded in spaced apart tracks on the record medium, and extended audio information for each frame is recorded in a plurality of individually transcribable tracks between the video tracks. The information is read simultaneously from one of the video tracks and from all of the audio tracks for one frame, and the information from successive ones of the audio tracks is processed sequentially to provide extended sound during repeated reproduction of the picture.

System and method for reproducing pictures and related audio information

An information carrier, and a method of recording thereon, wherein information containing signals are recorded in discrete tracks along with a unique address signal for each track. An identification code signal is also recorded at preselected locations between adjacent tracks.

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Palo Alto, CA, United States of America

Jonathan A Jerome