Method and apparatus for standardizing nonstandard video signals
First Claim
1. A method of correcting color video signals represented in digital form having a horizontal scan frequency which is an even harmonic of the color subcarrier to an N.T.S.C. interlaced color video signal having N.T.S.C. luminance and chrominance components and being compatible with and superimposable on other N.T.S.C. color video signals comprising the steps of:
- (a) writing the digitized signals into at least one line memory at selected memory locations;
(b) means for resetting the source of the video signals to be corrected once during each N.T.S.C. vertical field to synchronize said source to the N.T.S.C. vertical frame rate;
(c) reading out the digitized video signals from selected memory locations in said line memories at a clock rate synchronized with an N.T.S.C. source;
(d) extracting luminance and chrominance information from the read out signals including the step of shifting the signal sampling window every other horizontal line for either the chrominance or luminance information;
(e) combining the information extracted in step (d) to obtain corrected, analog color video signals.
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Abstract
A method and apparatus are disclosed for converting nonstandard video signals, such as generated by popular micro computers to N.T.S.C. video standard signals. The nonstandard video is digitized and temporarily stored in one or more line memories. The data is then removed from the line memories by a clock signal related to a N.T.S.C. source. A luminance and chrominance converter circuit converts the horizontal scan frequency from an even harmonic to an odd harmonic of the color subcarrier so that the luminance information is properly related to the horizontal timing and chrominance is properly related to the color subcarrier. The corrected signal can be gen-locked to an external video signal and superimposed on such external signal.
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Citations
18 Claims
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1. A method of correcting color video signals represented in digital form having a horizontal scan frequency which is an even harmonic of the color subcarrier to an N.T.S.C. interlaced color video signal having N.T.S.C. luminance and chrominance components and being compatible with and superimposable on other N.T.S.C. color video signals comprising the steps of:
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(a) writing the digitized signals into at least one line memory at selected memory locations; (b) means for resetting the source of the video signals to be corrected once during each N.T.S.C. vertical field to synchronize said source to the N.T.S.C. vertical frame rate; (c) reading out the digitized video signals from selected memory locations in said line memories at a clock rate synchronized with an N.T.S.C. source; (d) extracting luminance and chrominance information from the read out signals including the step of shifting the signal sampling window every other horizontal line for either the chrominance or luminance information; (e) combining the information extracted in step (d) to obtain corrected, analog color video signals. - View Dependent Claims (2, 3, 4, 5)
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6. Apparatus for correcting color video signals represented in digital form having a horizontal scan frequency which is an even harmonic of the color subcarrier to an N.T.S.C. interlaced color video signal having N.T.S.C. luminance and chrominance components and being compatible with and superimposable on other N.T.S.C. color video signals comprising:
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(a) at least one memory for storing a horizontal line of digitized video signals; (b) means for writing the digitized video signals into said line memory at selected memory locations; (c) means for resetting the source of the video signals to be corrected once during each N.T.S.C. vertical field to synchronize said source to the N.T.S.C. vertical frame; (d) means for reading out the digitized video signals from selected memory locations in said line memory at a clock rate synchronized with an N.T.S.C. source; (e) means for extracting luminance and chrominance information from the read out signals including means for shifting the signal sampling window every other horizontal line for either the chrominance or luminance information to establish the proper N.T.S.C. phase relationship of the chrominance information to the color subcarrier and luminance to horizontal scan frequency; (f) means for combining the information extracted by element (e) to produce the corrected color video signals. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification