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Method and apparatus for stop-motion playback of a record disc
| Details |
Inventors: Dakin, Wayne R.;
Assignee: Discovision Associates (Costa Mesa, CA)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:
A video record medium, such as a record disc, for recording a composite video and audio signal suitable for stop-motion playback, with accompanying audio. Discrete segments of an analog audio signal are digitized and compressed in time and recorded on alternate tracks on the disc, and corresponding frames of a video signal are recorded on the tracks located therebetween. During playback of the disc, a selected audio track is scanned initially and the digital audio data recovered therefrom is entered into a memory device, after which the track for recording the corresponding video frame is scanned in a repeated fashion, to produce a stop-motion display of the frame, while the stored audio data is extracted from the memory device and converted back to an analog format, for simultaneous playback at its original speed. |
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DETAILED DESCRIPTION The present invention is embodied in a record medium for recording a specially-formatted composite signal that includes both a video signal, representative of a video frame, and a corresponding audio signal, wherein the medium is suitable for use with special playback apparatus for displaying the video frame, in a repeated fashion, while accompanied by a playback of a corresponding analog audio signal.
In accordance with the invention, the audio signal is recorded in a special time-compressed format on a first portion of the medium, and the video signal is recorded on a second portion of the medium, whereby apparatus for playing the record medium can operate to re-create the analog audio signal corresponding to the time-compressed audio signal, while the video frame is being displayed, repeatedly, a prescribed number of times.
More particularly, a record medium in accordance with the present invention is in the form of a record disc having a succession of substantially circular and concentrically arranged recording tracks.
The special time-compressed audio signal is recorded on alternate tracks on the disc, and the corresponding frames of the video signal are recorded on the tracks therebetween.
The audio signal is preferably in a digital format, and is arranged in a succession of bit packets that are interleaved with conventional periodic video synchronization signals, whereby the recorded audio signal has the appearance of a conventional video signal with a luminance value that alternates between white and black levels.
Additionally, the bit rate of the successive bit packets in the recorded digital audio signal is synchronized with the frequency of periodic chrominance burst signals included in the video synchronization signals, thereby further simplifying detection during playback.
The recorded disc is suitable for playback in a stop-motion fashion, wherein each of the recorded video frames is displayed, in a repeated fashion, a prescribed number of times, while, simultaneously, the corresponding digital audio signal is converted back to an original analog format, for playback at its original speed
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