It's possible, but not likely. The Sony can double incoming analog transmissions to 960i, and the HDTV STB can usually scale incoming analog transmissions to 1080i. But remember that the HDTV box will be outputting 16:9 at 1080i. So the Sony will end up squeezing it and you'll have the picture box effect.
Most HDTV boxes that can output 4:3 properly are outputting either 540p or 480p (or 480i) when they output 4:3. So then there's no real advantage.
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