Synchronization of plural video reproducing systems

Claim 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.

Claim 2

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.

Claim 13

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.

Claim 14

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.