Importance

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Abstract

A real time frame grabbing system for substantially instantaneously providing a continuous video display of a selectably predetermined video frame of information on a video display means from continuously transmittable video information which is transmitted as a plurality of pseudo video scan lines wherein the selected frame being grabbed is updateable on a displayable-row-by-displayable-row basis. Each of the pseudo video scan lines has a television scan line format and comprises a complete self-contained packet of digital information sufficient to provide an entire displayable row of video data characters, the pseudo video scan line having an associated transmission time equivalent to that of a television video scan line. The packet of digital information comprises at least address information for a displayable row and data information for the displayable characters in the row. Each of these pseudo video scan lines further comprises a horizontal sync signal at the beginning thereof and a start bit pulse between the horizontal sync signal and the packet of digital information. The start bit pulse provides a unique synchronizing pulse for each transmitted pseudo video scan line for enabling precise determination of a sampling time for the received distributed pseudo video scan line to enable accurate determination of the binary state of the bits comprising the digital information packet, with the receiver being responsive to the occurrence of the start bit for each distributed pseudo video scan line for providing a reset signal for resetting the signal processing means in response to detection of the start bit to provide enhanced noise immunity and accurate signal information. The pseudo video scan lines are both transmitted and received through a conventional television distribution system. If desired, a local micro-processor may be utilized to control the functions of the receiver terminal and may be used in conjunction with a printer interface to enable both continuous high speed video display and real time pick off for hard copy printing.

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First Claim