v. To convert a product or system to a higher standard or version.
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Some local stations for the other networks also plan similarly to "upconvert" their analog programming to simulate HDTV.
—Joel Brinkley, “The Dawn of HDTV, Ready or Not,” The New York Times, October 26, 1998
An upconverter that can recognize this distinctive 3-2 pulldown process can reconstruct the original film frame and upconvert the complete frame without introducing temporal artifacts….

Downconversion has its own set of problems. Whereas upconversion has the unique problem of trying to create more than what was there, downconversion attempts to display an HD image using fewer lines.
—Kenneth Hunold, “HD in the USA: Understanding HD/SD conversion,” World Broadcast News, September 01, 1998
1991 (earliest)
To expand the range of applications, Mitsubishi built a video scan converter into the 37-inch monitor. With the converter, the XC-3725C is the only high-resolution monitor that up-converts standard NTSC, PAL, SECAM or S-VHS video to 31.5 kHz non-interlaced, and simultaneously broadens the compatibility range and improves the signal quality.
—“Mitsubishi creates new computer monitor category with the introduction of the world's largest auto-scanning high-resolution-compatible color display monitor,” Business Wire, April 29, 1991
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