Recombination of low- and high-resolution segments of an extende

Details Recombination of low- and high-resolution segments of an extende Recombination of low- and high-resolution segments of an extende

1984-12-21

1987-09-15

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 37, 358166, 358 12, 358141, H04N 964, H04N 708, H04N 1120, H04N 5208

Patent

active

046943285

ABSTRACT:
A television (TV) system having provision for automatically compensating for signal distortion which would cause artifacts at the point where high- and low-resolution portions of an extended aspect ratio, high-definition TV display are joined together. Compensation parameters are calculated at the TV receiver in response to a known test pattern transmitted during the vertical retrace interval of the TV display and then accessed and utilized to compensate received active display signals. The compensation parameters are calculated by first converting Y, I, and Q signals for the test pattern into digital samples and then processing these digital samples in a digital signal processor unit. After the compensation parameters have been calculated by the digital signal processor, they are stored in a memory. The received active display signals are compensated by accessing the stored compensation parameters during the active display time. Each accessed compensation parameter is converted to an analog signal and is multiplied with received Y, I, and Q edge signals and combined with the center signals to compensate for distortions. In addition, the stored parameters are also averaged over a period of time to stop transient conditions from affecting the stored value of a compensation parameter.

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