Re: Can anybody explain Progressive-PAL please?

"Tony Quinn" <tony@xxxxxxxxxxxxxxxxxxxx> wrote in message
news:7+5sL1GaIDFDFwr+@xxxxxxxxxxxxxxxxxxxxxxx
> In message <df1964$jdk$1@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>, John
> <JohnZIZnospam@xxxxxxxxxxxxxxxxxxx> writes
>>Tony Quinn wrote:
>>
>>
>>> >>> I wonder if it's sloppy usage, with "PAL" denoting 625/50 (or
>>> >>> rather 625/25!) rather than the colour standard.
>>> > >
>>> > > Confusing, isn't it? I was discussing the misuse of the term
>>> > > 'PAL' the other day, in another newsgroup, and was labelled by
>>> > > one person as 'pedantic'.
>>> > >
>>> > > I'd say it means 625/25, as well.
>>> >
>>> > It does, PAL is a system, not a technical standard.
>>> .
>>> Tell the Brazilians that....
>>
>>
>>Why are you worrying over what the Brazilian's get upto ?
>
> Merely to point out that PAL does NOT mean 625/50 (Brazil uses 525/60 with
> a 3.58 CSC). PAL is a colour encoding system that, if required, could work
> on 405/50 (the BBC did do some experiments with 405/50 NTSC IIRC) or
> 819/50 , the line standard is something else entirely.

"PAL" and "NTSC" are commonly used as convenient (if not completely
accurate) shortcuts for "625/50 with PAL colour" and "525/60 with NTSC
colo(u)r", since these are the two most common standards in the world. But I
agree that they are, strictly speaking, wrong if they are used to define the
number of lines and/or the field rate. But no-one has come up with a better
*non-technical* way of referring to these line/frame standards for purposes
of implying which TVs and VCRs tapes will play on.

Am I right that VHS tapes recording on a PAL-compatible VCR (eg in the UK)
will play perfectly on a SECAM-compatible VCR/TV? Isn't the signal on tape
indistinguishable (eg SECAM video signals translated to PAL on tape and vice
versa) and that it's only the tuner/modulator and the video in/out circuitry
that differs between the various 625-line variants of PAL and SECAM.

Does VHS actually encode the phase-alternating aspect of PAL? In other
words, could a US NTSC tape play on Brazillian equipment or does the fact
that Brazil and the US use a different colour system (although the same
line/frame/CSC rate) mean that the colour would be missing/corrupted? Is
that how European VCRs play US programmes: by producing PAL 525/60 rather
than true NTSC 525/60 so the TV only needs to handle a difference frame rate
and not a different colour standard as well?

Assuming that a DVD isn't region-encoded, how compatible are DVD players
around the world? Can most players play "foreign standard" discs, as long as
your TV can handle the "foreign" line/frame rate, or is there the same
situation as with VHS that most modern European equipment can handle NTSC
525/60 but US equipment that can handle PAL 625/50 (even for black-and-white
only) is rarer? I'm most impressed that my Panasonic VCR and TV auto adjust
between PAL 625 and NTSC 525 tapes perfectly: even the picture size adjusts
so both formats fill the whole screen.


.

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