Investigation into a novel mixing method for video signals
Abstract
A method for mixing video signals (nonadditive mixing) was introduced, in which an electronic switch controlled by the instantaneous value of the applied signals, always feeds the strongest signal to the output. In this way, the output signal can never be stronger than the strongest input signal, which is advantageous for use in mixers and faders. After explaining the principle, a simple circuit for utilizing the method was indicated. Designs were developed for equipment for the various functions of vision control, such as mixing and fading, special effects and caption inlay, and these were compared, as regards their cost and effect, with equipment of conventional design. Particular attention was given to operation with coded colour signals.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- November 1977
- Bibcode:
- 1977STIN...7824395F
- Keywords:
-
- Electric Pulses;
- Mixing;
- Video Equipment;
- Visual Signals;
- Image Processing;
- Signal Fading;
- Solid State Devices;
- Switching Circuits;
- Television Transmission;
- Communications and Radar