RECOMBINATION OF LOW- AND HIGH-RESOLUTION SEGMENTS OF AN EXTENDED ASPECT RATIO PICTURE

摘要

RECOMBINATION OF LOW- AND HIGH-RESOLUTION SEGMENTS OF AN EXTENDED ASPECT RATIO PICTURE A television (TV) system having provision for automatically compensating for signal distortion which would cause artifacts at the point where high- and lowresolution 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 by received, Y, I, and Q edge signals and combined with the center signals to compensate for distortions. In addition, the stored paramaters are also averaged over a period of time to stop transient conditions from affecting the stored value of a compensation paramater.