Synchronization of plural video reproducing systems
First Claim
Patent Images
1. A method of synchronizing reproduction using a plurality of video information reproducing systems, comprising the steps of:
- (a) searching and detecting a required video position identifying signal among the various items of video information recorded on each recording medium of said plurality of reproducing systems;
as(b) picking up video signals at the same time performing said detection;
(c) integrating for each of said recording media synchronization pulse signals included in said video signals using said video position identifying signal as a starting point;
(d) determining the advance and delay of video information by comparing the respective integrated values;
(e) controlling the reproducing speeds of said respective recording media on the basis of the result of said determination in such a manner that said integrated values coincide with each other; and
(f) setting the reproducing speeds of said respective recording media in a steady state when said integrated values coincide with each other.
2 Assignments
0 Petitions
Accused Products
Abstract
A method of and an apparatus for synchronizing reproduction using a plurality of video information reproducing systems are arranged such that synchronization pulses contained in video signals are integrated for each recording medium using as a starting point a required video position identifying signal recorded on each recording medium, and integrated values are made to coincide with each other, thereby allowing the video information of all the recording media to be reproduced synchronously. Thus, since synchronization of reproduction is effected while the reproducing systems are operating, there is no need to temporarily stop the reproducing systems as has been done conventionally. Consequently, if it is possible to effect synchronous reproduction even in the case of a CLV-type disk which cannot be temporarily stopped. In addition, the time duration required for synchronization can be reduced.
-
Citations
15 Claims
-
1. A method of synchronizing reproduction using a plurality of video information reproducing systems, comprising the steps of:
-
(a) searching and detecting a required video position identifying signal among the various items of video information recorded on each recording medium of said plurality of reproducing systems;
as(b) picking up video signals at the same time performing said detection; (c) integrating for each of said recording media synchronization pulse signals included in said video signals using said video position identifying signal as a starting point; (d) determining the advance and delay of video information by comparing the respective integrated values; (e) controlling the reproducing speeds of said respective recording media on the basis of the result of said determination in such a manner that said integrated values coincide with each other; and (f) setting the reproducing speeds of said respective recording media in a steady state when said integrated values coincide with each other. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. An apparatus for synchronizing reproduction using a plurality of video information reproducing systems, comprising:
-
(a) a plurality of reproducing systems each adapted to detect a required video position identifying signal from a recording medium, separate synchronization pulse signals from video signals picked up at the same time that said detection is being performed, and control the reproducing speed of said recording medium on the basis of a signal representing the advance or delay of video information input from the outside; (b) counter circuits for integrating synchronization pulse signals for each of said recording media using said video position identifying signal as a starting point; (c) a determination circuit for comparing the integrated values and determining advance or delay of the video information of said respective recording media; (d) oscillating circuits for generating a signal of a frequency corresponding to the amount of advance or delay determined for each of said recording media; and (e) switches each adapted to change over a signal serving as a reference for the reproducing speed of said recording medium from an output of said oscillating circuit to an output of a reference clock generator. - View Dependent Claims (13, 14, 15)
-
Specification
-
- Resources
Litigation Campaign Assessment
Thank you for your request. You will receive a custom alert email when the Litigation Campaign Assessment is available.
×
-
Current AssigneeGroup-N Corporation, KAZUYUKI KIDO, 393, SHIRANECHO, ASAHIKU, YOKOHAMA, KANAGAWA, JAPAN
-
Original AssigneeGroup-N Corporation
-
InventorsHoriuchi, Harumi, Kido, Kazuyuki
-
Primary Examiner(s)RICHARDSON, ROBERT
-
Application NumberUS07/051,337Time in Patent Office637 DaysField of Search358/310, 358/335, 358/320, 358/321, 358/322, 358/342, 358/323, 358/337, 358/338, 358/148, 358/149, 358/181, 358/182, 358/183, 360/33.1, 360/36.1, 360/14.1, 360/26, 360/55US Class Current386/207CPC Class CodesG11B 19/28 Speed controlling, regulati...G11B 2220/20 Disc-shaped record carriersG11B 27/002 Programmed access in sequen...G11B 27/10 Indexing; Addressing; Timin...
