Slow scan television scan converter
First Claim
1. A system for storing video information at both a slow scan rate and a fast scan rate, and for retrieving video information signals from said stored information at both the slow scan rate and the fast scan rate, comprising:
- a random access memory for storing information provided by digital video information signals;
an addressing means for addressing a selected location in the memory;
slow scan counting means for providing a count at the slow scan rate, wherein said slow scan count is provided to the addressing means for indicating a said selected location to be addressed in the memory when either storing or retrieving information at the slow scan rate;
fast scan counting means for providing a count at the fast scan rate, wherein said fast scan count is provided to the addressing means for indicating a said selected location to be addressed in the memory when either storing or retrieving information at the fast scan rate; and
address selection control means responsive to the fast scan counting means for causing the addressing means to address said selected locations in the memory indicated by the count provided by the fast scan counting means during intervals corresponding to one line of video information provided at the fast scan rate, and to address said selected locations in the memory indicated by the count provided by the slow scan counting means during blanking intervals between said video line intervals.
1 Assignment
0 Petitions
Reexamination
Accused Products
Abstract
A system for storing video information at both a slow scan rate and a fast scan rate, and for retrieving video information signals from the stored information at both the slow scan rate and the fast scan rate. A random access memory stores information provided by digital video information signals. An address selector addresses a selected location in the memory. A slow scan counter provides a count at the slow scan rate. The slow scan count is provided to the address selector for indicating the selected location to be addressed in the memory when either storing or retrieving information at the slow scan rate. A fast scan counter provides a count at the fast scan rate. The fast scan count is provided to the address selector for indicating the selected location to be addressed in the memory when either storing or retrieving information at the fast scan rate. An address selection control responds to the fast scan counter for causing the address selector to address the selected locations in the memory indicated by the count provided by the fast scan counter during intervals corresponding to one line of video information provided at the fast scan rate, and to address the selected locations in the memory indicated by the count provided by the slow scan counter during blanking intervals between the video line intervals.
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Citations
10 Claims
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1. A system for storing video information at both a slow scan rate and a fast scan rate, and for retrieving video information signals from said stored information at both the slow scan rate and the fast scan rate, comprising:
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a random access memory for storing information provided by digital video information signals; an addressing means for addressing a selected location in the memory; slow scan counting means for providing a count at the slow scan rate, wherein said slow scan count is provided to the addressing means for indicating a said selected location to be addressed in the memory when either storing or retrieving information at the slow scan rate; fast scan counting means for providing a count at the fast scan rate, wherein said fast scan count is provided to the addressing means for indicating a said selected location to be addressed in the memory when either storing or retrieving information at the fast scan rate; and address selection control means responsive to the fast scan counting means for causing the addressing means to address said selected locations in the memory indicated by the count provided by the fast scan counting means during intervals corresponding to one line of video information provided at the fast scan rate, and to address said selected locations in the memory indicated by the count provided by the slow scan counting means during blanking intervals between said video line intervals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification