Digital video signal processor with distortion correction
First Claim
1. An apparatus for compensating for signal distortions in an input digital signal comprising a plurality of ones and zeros defining an information content for said input digital signal, said input digital signal having associated peak-to-peak signal levels, respectively, defining said ones and zeros wherein said signal distortions in said input digital signal comprise said respective peak-to-peak signal levels associated with at least some of said plurality of ones and zeros comprising said input digital signal differing from said respective peak-to-peak signal levels associated with others of said plurality of ones and zeros comprising said input digital signal, said peak-to-peak signal levels of said input digital signal resulting from zero-to-one and one-to-zero transitions in said input digital signal, said compensating apparatus providing a compensated output digital signal from said distorted input digital signal having the same information content as said input digital signal defined information content, said plurality of ones and said plurality of zeros comprising said compensation output digital signal all having the same respective peak-to-peak signal levels varying about a common base level, said compensating apparatus comprising means for tracking said zero-to-one and one-to-zero transitions in said input digital signal, first means operatively connected to said tracking means and responsive to each tracked zero-to-one transition in the peak-to-peak signal level of said input digital signal for clamping the level of said zero-to-one transition at a first predetermined signal level irrespective of any continued rise in said level of said distorted input digital signal zero-to-one transition and maintaining said clamped zero-to-one transition at said first predetermined signal level until the presence of a subsequent one-to-zero transition in said distorted input digital signal is detected whereby said signal level becomes unclamped, said tracking means tracking said subsequent one-to-zero transition in said unclamped signal, and second means operatively connected to said tracking means and responsive to said tracked subsequent one-to-zero transition for said unclamped signal for reclamping the level of said tracked subsequent one-to-zero transition at a second predetermined signal level irrespective of any continued fall in said level of said distorted input digital signal subsequent one-to-zero transition until the presence of a subsequent zero-to-one transition in said distorted input digital signal is detected whereby said signal level of said reclamped signal again becomes unclamped, whereby said compensated output digital signal is provided from said distorted input signal.
0 Assignments
0 Petitions
Accused Products
Abstract
An apparatus for compensating for signal distortions in an input digital signal, such as a pseudo video scan line having a television video scan line format and capable of comprising a complete self-contained packet of digital information sufficient to provide an entire video displayable row of video data characters, said signal comprising a plurality of ones and zeroes defining the digital information therein, the pseudo video scan line having associated peak-to-peak signal levels respectively defining the ones and zeroes wherein the signal distortion in the signal comprise the respective peak-to-peak signal levels associated with at least some of the plurality of ones and zeroes differing from the respective peak-to-peak signal levels associated with others of this plurality, the peak-to-peak signal levels resulting from zero-to-one and one-to-zero transitions in the signal, provides a compensated output digital signal from the distorted input digital signal having the same information content wherein the plurality of ones and the plurality of zeroes comprising the compensated output digital signal all have the same respective peak-to-peak signal levels varying about a common base level. The compensating apparatus comprises means for tracking both the zero-to-one and the one-to-zero transitions in the input digital signal operatively associated with means responsive to both the zero-to-one and one-to-zero transitions for providing the compensated output digital signal in which all ones and all zeroes are of the same respective levels.
-
Citations
42 Claims
- 1. An apparatus for compensating for signal distortions in an input digital signal comprising a plurality of ones and zeros defining an information content for said input digital signal, said input digital signal having associated peak-to-peak signal levels, respectively, defining said ones and zeros wherein said signal distortions in said input digital signal comprise said respective peak-to-peak signal levels associated with at least some of said plurality of ones and zeros comprising said input digital signal differing from said respective peak-to-peak signal levels associated with others of said plurality of ones and zeros comprising said input digital signal, said peak-to-peak signal levels of said input digital signal resulting from zero-to-one and one-to-zero transitions in said input digital signal, said compensating apparatus providing a compensated output digital signal from said distorted input digital signal having the same information content as said input digital signal defined information content, said plurality of ones and said plurality of zeros comprising said compensation output digital signal all having the same respective peak-to-peak signal levels varying about a common base level, said compensating apparatus comprising means for tracking said zero-to-one and one-to-zero transitions in said input digital signal, first means operatively connected to said tracking means and responsive to each tracked zero-to-one transition in the peak-to-peak signal level of said input digital signal for clamping the level of said zero-to-one transition at a first predetermined signal level irrespective of any continued rise in said level of said distorted input digital signal zero-to-one transition and maintaining said clamped zero-to-one transition at said first predetermined signal level until the presence of a subsequent one-to-zero transition in said distorted input digital signal is detected whereby said signal level becomes unclamped, said tracking means tracking said subsequent one-to-zero transition in said unclamped signal, and second means operatively connected to said tracking means and responsive to said tracked subsequent one-to-zero transition for said unclamped signal for reclamping the level of said tracked subsequent one-to-zero transition at a second predetermined signal level irrespective of any continued fall in said level of said distorted input digital signal subsequent one-to-zero transition until the presence of a subsequent zero-to-one transition in said distorted input digital signal is detected whereby said signal level of said reclamped signal again becomes unclamped, whereby said compensated output digital signal is provided from said distorted input signal.
- 26. An apparatus for compensating for signal distortions in an input digital signal comprising a plurality of ones and zeroes defining an information content for said input digital signal, said input digital signal having associated peak-to-peak signal levels respectively defining said ones and zeroes wherein said signal distortions in said input digital signal comprise said respective peak-to-peak signal levels associated with at least some of said plurality of ones and zeroes comprising said input digital signal differing from said respective peak-to-peak signal levels associated with others of said plurality of ones and zeroes comprising said input digital signal, said peak-to-peak signal levels of said input digital signals resulting from zero-to-one and one-to-zero transitions in said input digital signal, said compensating apparatus providing a compensated output digital signal from said distorted input digital signal having the same information content as said input digital signal defined information content, said plurality of ones and said plurality of zeroes comprising said compensated output digital signal all having the same respective peak-to-peak signal levels varying about a common base level, said compensating apparatus comprising means for tracking said zero-to-one and one-to-zero transitions in said input digital signal, first means operatively connected to said tracking means and response to each tracked one-to-zero transition in the peak-to-peak signal level of said input digital signal for clamping the level of said one-to-zero transition at a first predetermined signal level irrespective of any continued fall in said level of said distorted input digital signal one-to-zero transition and maintaining said clamped one-to-zero transition at said first predetermined signal level until the presence of a subsequent zero-to-one transition in said distorted input digital signal is detected whereby said signal level becomes unclamped, said tracking means tracking said subsequent zero-to-one transition in said unclamped signal, and second means operatively connected to said tracking means and responsive to said tracked subsequent zero-to-one transition for said unclamped signal for reclamping the level of said tracked subsequent zero-to-one transition at a second predetermined signal level irrespective of any continued rise in said level of said distorted input digital signal subsequent zero-to-one transition until the presence of a subsequent one-to-zero transition in said distorted input digital signal is detected whereby said signal level of said reclamped signal again becomes unclamped, whereby said compensated output digital signal is provided from said distorted input signal.
-
28. In a real time frame grabbing video display terminal for substantially instantaneously providing a continuous direct video display of a selectable predetermined video frame of information on a video display means from continuously receivable information remotely provided over a transmission media, said continuously receivable information comprising a plurality of pseudo video scan lines, each of said pseudo video scan lines having a television video scan line format and capable of comprising a complete self-contained packet of digital information sufficient to provide an entire displayable row of video data characters, said pseudo video scan line having an associated transmission time equivalent to said television video scan line, said packet of digital information comprising at least address information for said displayable row and data information for said displayable characters in said displayable row, said pseudo video scan line being a composite video signal, said terminal comprising microcomputer means for controlling the operation thereof, said microcomputer means being operatively connected to said transmission media for receiving said continuously receivable information and selection means operatively connected to said microcomputer means for variably selecting said predetermined video frame to be continuously displayed;
- the improvement comprising an apparatus for compensating for signal distortions in said received pseudo video scan line, said received pseudo video scan line comprising a plurality of ones and zeroes defining said digital information, said received pseudo video scan line having associated peak-to-peak signal levels respectively defining said ones and zeroes wherein said signal distortios in said received pseudo video scan line comprise said respective peak-to-peak signal levels associated with at least some of said plurality of ones and zeroes comprising said received pseudo video scan line differing from said respective peak-to-peak signal levels associated with others of said plurality of ones and zeroes comprising said received pseudo video scan line, said peak-to-peak signal levels of said received pseudo video scan line resulting from zero-to-one and one-to-zero transitions in said received pseudo video scan lines, said compensating apparatus providing a compensated output pseudo video scan line from said distorted received pseudo video scan line having the same information as said received pseudo video scan line defined information, said plurality of ones and said plurality of zeroes comprising said compensated pseudo video scan line all having the same respective peak-to-peak signal levels varying about a common base level, said compensating apparatus comprising means for tracking said zero-to-one and one-to-zero transitions in said received pseudo video scan line, first means operatively connected to said tracking means and responsive to each tracked zero-to-one transition in the peak-to-peak signal level of said received pseudo video scan line for clamping the level of said zero-to-one transition at a first predetermined signal level irrespective of any continued rise in said level of said distorted received pseudo video scan line zero-to-one transition and maintaining said clamped zero-to-one transition at said first predetermined signal level until the presence of a subsequent one-to-zero transition in said distorted received pseudo video scan line is detected whereby said signal level becomes unclamped, said tracking means tracking said subsequent one-to-zero transition in said unclamped signal, and second means operatively connected to said tracking means and responsive to said tracked subsequent one-to-zero transition for said unclamped signal for reclamping the level of said tracked subsequent one-to-zero transition at a second predetermined signal level irrespective of any continued fall in said level of said distorted received pseudo video scan line subsequent one-to-zero transition until the presence of a subsequent zero-to-one transition in said distorted received pseudo video scan line whereby said signal level of said reclamped signal again becomes unclamped, whereby said compensated pseudo video scan line is provided from said distorted received pseudo video scan line for providing said continuous direct video display.
- View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36)
-
37. In a real time frame grabbing video display terminal for substantially instantaneously providing a continuous direct video display of a selectable predetermined video frame of information on a video display means from continuously receivable information remotely provided over a transmission media, said continuously receivable information comprising a plurality of pseudo video scan lines, each of said pseudo video scan lines having a television video scan line format and capable of comprising a complete self-contained packet of digital information sufficient to provide an entire displayable row of video data characters, said pseudo video scan line having an associated transmission time equivalent to said television video scan line, said packet of digital information comprising at least address information for said displayable row and data information for said displayable characters in said displayable row, said pseudo video scan line being a composite video signal, said terminal comprising microcomputer means for controlling the operation thereof, said microcomputer means being operatively connected to said transmission media for receiving said continuously receivable information and selection means operatively connected to said microcomputer means for variably selecting said predetermined video frame to be continuously displayed;
- the improvement comprising an apparatus for compensating for signal distortions in said received pseudo video scan line, said received pseudo video scan line comprising a plurality of ones and zeroes defining said digital information, said received pseudo video scan line having associated peak-to-peak signal levels respectively defining said ones and zeroes wherein said signal distortions in said received pseudo video scan line comprise said respective peak-to-peak signal levels associated with at least some of said plurality of ones and zeroes comprising said received pseudo video scan line differing from said respective peak-to-peak signal levels associated with others of said plurality of ones and zeroes comprising said received pseudo video scan line, said peak-to-peak signal levels of said received pseudo video scan line resulting from zero-to-one and one-to-zero transitions in said received pseudo video scan lines, said compensating apparatus providing a compensated output pseudo video scan line from said distorted received pseudo video scan line having the same information as said received pseudo video scan line defined information, said plurality of ones and said plurality of zeroes comprising said compensated pseudo video scan line all having the same respective peak-to-peak signal levels varying about a common base level, said compensating apparatus comprising means for tracking said zero-to-one and one-to-zero transitions in said received pseudo video scan line, first means operatively connected to said tracking means and responsive to each tracked one-to-zero transition in the peak-to-peak signal level of said received pseudo video scan line for clamping the level of said one-to-zero transition at a first predetermined signal level irrespective of any continued fall in said level of said distorted received pseudo video scan line one-to-zero transition and maintaining said clamped one-to-zero transition at said first predetermined signal level until the presence of a subsequent zero-to-one transition in said distorted received pseudo video scan line is detected whereby said signal level becomes unclamped, said tracking means tracking said subsequent zero-to-one transition in said unclamped signal, and second means operatively connected to said tracking means and responsive to said tracked subsequent zero-to-one transition for said unclamped signal for reclamping the level of said tracked subsequent zero-to-one transition at a second predetermined signal level irrespective of any continued rise in said level of said distorted received pseudo video scan line subsequent zero-to-one transition until the presence of a subsequent one-to-zero transition in said distorted received pseudo video scan line is detected whereby said signal level of said reclamped signal again becomes unclamped, whereby said compensated pseudo video scan line is provided from said distorted received pseudo video scan line for providing said continuous direct video display.
- View Dependent Claims (38)
-
39. In a real time frame grabbing system for substantially instantaneously providing a continuous video display of a selectable predetermined video frame of information on a video display means from continuously transmittable video information comprising means for transmitting said video information as a plurality of pseudo video scan lines, each of said pseudo video scan lines having a television video scan line format and capable of comprising a complete self-contained packet of digital information sufficient to provide an entire displayable row of video data characters, said pseudo video scan line having an associated transmission time equivalent to said television video scan line, said packet of digital information comprising at least address information for said displayable row and data information for said displayable characters in said displayable row, each of said pseudo video scan lines further comprising a horizontal sync signal at the beginning thereof, said horizontal sync signal providing a record separator between adjacent pseudo video scan lines, said transmitting means further comprising means for providing a vertical sync signal after a predetermined plurality of pseudo video scan lines have been transmitted, said pseudo video scan line being a composite video signal, said system further comprising television signal distribution means for distributing said transmitted composite pseudo video scan line signals to said video display means for providing said continuous video display and receiver means operatively connected between said television signal distribution means and said video display means for processing said distributed composite pseudo video scan line signals and capable of providing a displayable video row signal to said video display means from each of said pseudo video scan line signals pertaining to said selected frame for providing said continuous video display;
- the improvement comprising an apparatus for compensating for signal distortions in said received pseudo video scan line, said receiver means comprising said compensating apparatus, said pseudo video scan line comprising a plurality of ones and zeroes defining said digital information, said received pseudo video scan line having associated peak-to-peak signal levels respectively defining said ones and zeroes wherein said signal distortions in said received pseudo video scan line comprise said respective peak-to-peak signal levels associated with at least some of said plurality of ones and zeroes comprising said received pseudo video scan line differing from said respective peak-to-peak signal levels associated with others of said plurality of ones and zeroes comprising said received pseudo video scan line, said peak-to-peak signal levels of said received pseudo video scan line resulting from zero-to-one and one-to-zero transitions in said received pseudo video scan line, said compensating apparatus providing a compensated output pseudo video scan line having the same information as said received pseudo video scan line defined information, said plurality of ones and said plurality of zeroes comprising said compensated pseudo video scan line all having the same respective peak-to-peak signal levels varying about a common base level, said compensating apparatus comprising means for tracking said zero-to-one and one-to-zero transitions in said received pseudo video scan line, first means operatively connected to said tracking means and responsive to each tracked zero-to-one transition in the peak-to-peak signal level of said received pseudo video scan line for clamping the level of said zero-to-one transition at a first predetermined signal level irrespective of any continued rise in said level of said distorted received pseudo video scan line zero-to-one transition and maintaining said clamped zeroone transition at said first predetermined signal level until the presence of a subsequent one-to-zero transition in said distorted received pseudo video scan line is detected whereby said signal level becomes unclamped, said tracking means tracking said subsequent one-to-zero transition in said unclamped signal, and second means operatively connected to said tracking means and responsive to said tracked subsequent one-to-zero transition for said unclamped signal for reclamping the level of said tracked subsequent one-to-zero transition at a second predetermined signal level irrespective of any continued fall in said level of said distorted received pseudo video scan line subsequent one-to-zero transition until the presence of a subsequent zero-to-one transition in said distorted received pseudo video scan line is detected whereby said signal level of said reclamped signal again becomes unclamped, whereby said compensated pseudo video scan line is provided from said distorted received pseudo video scan line for providing said continuous video display.
- View Dependent Claims (40)
-
41. In a real time frame grabbing system for substantially instantanteously providing a continuous video display of a selectable predetermined video frame of information on a video display means from continuously transmittable video information comprising means for transmitting said video information as a plurality of pseudo video scan lines, each of said pseudo video scan lines having a television video scan line format and capable of comprising a complete self-contained packet of digital information sufficient to provide an entire displayable row of video data characters, said pseudo video scan line having an associated transmission time equivalent to said television video scan line, said packet of digital information comprising at least address information for said displayable row and data information for said displayable characters in said displayable row, each of said pseudo video scan lines further comprising a horizontal sync signal at the beginning thereof, said horizontal sync signal providing a record separator between adjacent pseudo video scan lines, said transmitting means further comprising means for providing a vertical sync signal after a predetermined plurality of pseudo video scan lines have been transmitted, said pseudo video scan line being a composite video signal, said system further comprising television signal distribution means for distributing said transmitted composite pseudo video scan line signals to said video display means for providing said continuous video display and receiver means operatively connected between said television signal distribution means and said video display means for processing said distributed composite pseudo video scan line signals and capable of providing a displayable video row signal to said video display means from each of said pseudo video scan line signals pertaining to said selected frame for providing said continuous video display;
- the improvement comprising an apparatus for compensating for signal distortions in said received pseudo video scan line, said receiver means comprising said compensating apparatus, said pseudo video scan line comprising a plurality of ones and zeros defining said digital information, said received pseudo video scan line having associated peak-to-peak signal levels respectively defining said ones and zeroes wherein said signal distortions in said received pseudo video scan line comprise said respective peak-to-peak signal levels associated with at least some of said plurality of ones and zeroes comprising said received pseudo video scan line differing from said respective peak-to-peak signal levels associated with others of said plurality of ones and zeroes comprising said received pseudo video scan line, said peak-to-peak signal levels of said received pseudo video scan line resulting from zero-to-one and one-to-zero transitions in said received pseudo video scan line, said compensating apparatus providing a compensated output pseudo video scan line from said distorted received pseudo video scan line having the same information as said received pseudo video scan line defined information, said plurality of ones and said plurality of zeroes comprising said compensated pseudo video scan line all having the same respective peak-to-peak siganl levels varying about a common base level, said compensating apparatus comprising means for tracking said zero-to-one and one-to-zero transitions in said received pseudo video scan line, first means operatively connected to said tracking means and responsive to each tracked one-to-zero transition in the peak-to-peak signal level of said received pseudo video scan line for clamping the level of said one-to-zero transition at a first predetermined signal level irrespective of any continued fall in said level of said distorted received pseudo video scan line one-to-zero transition and maintaining said clamped one-to-zero transition at said first predetermined signal level until the presence of a subsequent zero-to-one transition in said distorted received pseudo video scan line is detected whereby said signal level becomes unclamped, said tracking means tracking said subsequent zero-to-one transition in said unclamped signal, and second means operatively connected to said tracking means and responsive to said tracked subsequent zero-to-one transition for said unclamped signal for reclamping the level of said tracked subsequent zero-to-one transition at a second predetermined signal level irrespective of any continued rise in said level of said distorted received pseudo video scan line subsequent zero-to-one transition until the presence of a subsequent one-to-zero transition in said distorted received pseudo video scan line is detected, whereby said signal level of said reclamped signal again becomes unclamped, whereby said compensated pseudo video scan line is provided from said distorted received pseudo video scan line for providing said continuous video display.
- View Dependent Claims (42)
Specification