Yes with all the terms you are some times talking Apples and Oranges. I have seen 1050 HD analog though not for several years. The first time I saw a live studio TV camera on a high quality NTSC monitor it was realy something. In this kind of setup NTSC can get very close to DVD quality.
Usualy what I do is refer to this link on cnet.
This link does a good job of covering the basics.
If anyone has questions after reading this I will be glad to answer. John
...There seems to be a great deal of confusion around here about these two terms (not unlike "healthy" and "low calorie" in the world of dieting....no, Virginia, they're not synonymous!). I'm pretty sure I understand the difference(s) but it might be helpful i some technically minded poster could post something briefly explaining that the two terms are really entirely independant.
High def is not digital and, more to the point, digital does NOT mean that what you're watching is necessarily "high def."