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Method and apparatus for recording and retrieving video information in two modes on a single laser recording disc
| Details |
Inventors: Sontheimer, Carl G.;
Assignee:
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:
There is disclosed method and apparatus for recording and retrieving video information in two modes on a single laser recording disc. An annular portion of the disc carries still frame information recorded at a constant angular velocity. One still frame occupies a track or groove extending around exactly one full revolution of the disc recorded at constant angular velocity. Thus, any given still frame is presented on the video screen by repeatedly scanning one track for so long as that particular still frame is desired to be shown on the video screen. Another annular portion of the disc carries video information, i.e. the dynamic parts of a video program, recorded at constant linear velocity along the track or groove being scanned on the disc. A scanning head may be selectively shifted beween the two annular regions in order to incorporate predetermined still frames into the video program at desired spots during the program. The disc drive speed is adjusted to provide the correct angular or linear velocity depending upon the portion of disc being played back at any instant. If desired, a controller automatically can fill the video screen with pertinent or interesting presentations during the brief time intervals whenever the scanning head is being shifted fron one portion of the disc to another. |
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DETAILED DESCRIPTION In my thinking, there are certain circumstances under which it is desirable to combine the advantages on one laser disc of longer playing time, achievable with constant linear velocity, with the ability of displaying still frames interspersed into the program appropriate critical moments in the drama, or travel story or instructional presentation, etc.
through use of constant angular velocity for achieving dramatic impact, suspense, transitions, emphasis in advertising or sales presentations, for enhancing retention of vital information in educational or instruction programs, for showing clearly medical procedures, and for many other worthwhile reasons.
Accordingly, it is a primary object of the present invention to provide method and apparatus for combining the advantages of constant angular velocity storage and constant linear velocity storage utilizing the same storage disc and to provide a novel laser disc record.
Other objects, features, and advantages will become understood from a consideration of the following description and appended claims.
In practicing this invention there is the storage of video information in at least two modes on a single laser recording memory disc.
First video information relating to still frame video presentations is stored on the disc in a first annular region at a substantially constant angular velocity.
The second video information relating to the main dynamic video presentation or main body of the program is then stored on the same disc in a second annular region at a substantially constant linear velocity.
A microprocessor controller at the appropriate moments shifts the scanning head from the main program (constant linear velocity region of the disc) over to the still frame presentations (constant angular velocity region of the disc preferably nearer the disc's axis).
This controller can also automatically show appropriate text or displays or designs, or other appropriate video material, on the video screen during the brief time intervals while the scanning head is being shifted from one region of the disc to the other
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