Re: Can anybody explain Progressive-PAL please?

"Paul Ratcliffe" <abuse@xxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:slrndh9skf.53h.abuse@xxxxxxxxxxxxxxxxxx
> On Tue, 30 Aug 2005 21:04:14 +0100, Roderick Stewart
> <rjfs@xxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>
>> I'm not sure exactly how SECAM is recorded on VHS, but PAL and NTSC
>> subcarriers
>> are definitely recorded as frequnecy-shifted but otherwise unchanged
>> versions
>> of the originals.
>
> SECAM is decoded to Y/C, as is PAL. That is recorded on tape using the
> "colour-under" method. This is why the tape can handle either - it doesn't
> know the difference between PAL and SECAM. The in/out signals are
> dependent
> on the machine, not the tape.

So does that mean that the format on VHS tape is independent of the colour
encoding system used for the baseband video - ie that a PAL/SECAM 625/50
tape would *in theory* play back on an NTSC 525/60 machine (complete with
regenerated NTSC subcarrier) if it wasn't for the "little" matter of the
different line/frame rates? Or, more realistically, that a US 525/60 NTSC
tape would play back in a Brazilian VCR and generate a true 525/60 PAL
signal?

When UK VCRs play back US tapes, they generate 525/60 PAL rather than 525/60
NTSC, don't they, which suggests that the tape format doesn't retain the
colour system and the native Y/C to composite conversion of the VCR is used.


Do French and Russian TV studios use special SECAM equipment (going back to
the days before digital TV production) or do they use PAL and just convert
to SECAM at the transmitter?


.

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