MULTIPLE CHANNEL VIDEO SWITCHING SYSTEM

• US 3,736,377 A
• Filed: 05/10/1971
• Issued: 05/29/1973
• Est. Priority Date: 05/10/1971
• Status: Expired due to Term

• Current Assignee: Robert H. Warren Jr
• Original Assignee: Robert H. Warren Jr
• Inventors: Warren, Robert H. Jr.
• Primary Examiner(s): Richardson, Robert L.
• Application Number:
  US05/141,559
• Time in Patent Office: 750 Days
• Field of Search: 178/6,6.8,7.1,7.2,DIG.6
• US Class Current: 348/588
• CPC Class Codes: H04N 5/2624 for obtaining an image which is composed of whole input images, e.g. splitscreen

Abstract

composite display system for a plurality of television cameras in which one camera develops synchronizing signals and video waveform switching signals for the other cameras using delays from one-shot multivibrator circuits. The video switching is performed by a circuit having dual gate insulated insulated effect transistors with one gate of each being fed by a switching waveform signal and the other gate by the video signal from the corresponding camera.

Claims

1. A composite television display system comprising:

a. a first television camera having an output of synchronizing signals and a video signal output;

b. a second television camera having a video signal output;

c. means for generating synchronizing signals corresponding to the composite display portion of the second television camera and fed to the second television camera, the synchronizing signal generating means being fed by the synchronizing output of the first television camera;

d. means for generating a plurality of video switching waveforms corresponding to the composite display, the switching waveform generating means being fed by the synchronizing output of the first television camera; and

e. a video switching circuit fed by the video signals of the first and second television and the switching waveforms.

2. A composite television display system according to claim 1 where the means for generating synchronizing signals and the means for generating switching waveforms are one-shot multivibrator circuits.

3. A composite television display system according to claim 2 wherein the video switching circuit includes a plurality of dual gate field effect transistors with one gate of each transistor being fed by the waveform generator means and the other gate being fed by a corresponding video signal.