Key priority for a mix/effect bank having multiple keyers
US6421095B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 29, 1999 |
| Grant date | Jul 16, 2002 |
| Priority date | — |
| Expiry date | Jul 29, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/265
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A mix/effect bank has its capability doubled by increasing the number of keyers input from two to four. The outputs from the keyers are routed through a crosspoint matrix for form a current and a next stack representing the priority of the keyer outputs from highest to lowest. The current stack is input to a current priority combiner and the next stack is input to a next priority combiner. The output of the current priority combiner is a program video output bus and the output of the next priority combiner is a preview video output bus. The two buses are input to a transition mixer, the output of which is coupled through a program/preview switch to the program video output bus. The transition mixer passes the output of the current priority combiner to the program video output bus except when the transition is made between preview and program, at which point the transition product is provided to the program video output bus. At the completion of the transition the next stack is switched to the current stack in the crosspoint matrix and the transition mixer again passes the output from the current priority combiner to the program video output bus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.