[opendtv] Re: Digital vs. Analog Quality

  • From: "John Shutt" <shuttj@xxxxxxxxx>
  • To: <opendtv@xxxxxxxxxxxxx>
  • Date: Tue, 8 Jul 2008 14:37:06 -0400

As you noted, Betacam was a "4:2:2" analog component recording system. Those specs you cited were for the component video output, not the NTSC output.


Betamax and VHS were color-under recording systems, where the 3.58 MHz chroma signal was downconverted to 688 KHz for Betamax (and U-Matic) and 622 KHz for VHS. This fact alone guarantees that Betamax and VHS will always have extremely crappy chroma resolution, even if the luma resolution is decent (ala SuperBeta and SVHS.).

John


----- Original Message ----- From: "Cliff Benham" <flyback1@xxxxxxxxxxx>

I think there are several examples of wideband color difference signals being used in NTSC. As far back as the late 1970s, baseband NTSC has been capable of 120 lines of chroma resolution. This includes Laserdisk and later in the early 1980s, analog component recording formats, notably Betacam.

[Betacam]"provides a crisp, true broadcast quality product with 300 lines of horizontal luma resolution, and 120 lines chroma resolution (versus ~30 for Betamax/VHS)." http://en.wikipedia.org/wiki/Betacam





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