Re: Can anybody explain Progressive-PAL please?

"charles" <charles@xxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:4da2bb1437charles@xxxxxxxxxxxxxxxxxxxxxxxxxx
> In article <4314c87a$0$97106$ed2619ec@xxxxxxxxxxxxxxxxxxxxxxxxxx>,
> Martin Underwood <a@b> wrote:
>> "Eric Putt" <putte@xxxxxxxxxxxxx> wrote in message
>
>> As a matter of interest, does SECAM suffer any artifacts from colour and
>> luma information overlapping in same the way that PAL and NTSC suffer
>> cross-colour?
>
> probably not - but its years since I worked with Secam. The subcarrier
> being FM should avoid cross-colour problems. Secam did have another
> problem
> in that the output of the colour part was at a fixed level while link
> fading
> could change the luminance component; the result was varying colour
> saturation. Mind you a decent agc circuit should stop that.

Ah. I'd forgotten that SECAM's colour info was FMed rather than DSB-AMed
onto the subcarrier. Does SECAM use the same subcarrier as PAL - 4.43 MHz?
How come SECAM can accomodate FM whereas PAL and NTSC can't?


.

Relevant Pages

  • Re: Can anybody explain Progressive-PAL please?
    ... >> probably not - but its years since I worked with Secam. ... >> being FM should avoid cross-colour problems. ... > with PAL because the chroma is fixed amplitude rather than variable. ... The subcarrier is fed through a bell-shaped filter ...
    (uk.tech.broadcast)
  • Re: Can anybody explain Progressive-PAL please?
    ... > As a matter of interest, does SECAM suffer any artifacts from colour and ... > luma information overlapping in same the way that PAL and NTSC suffer ... probably not - but its years since I worked with Secam. ... being FM should avoid cross-colour problems. ...
    (uk.tech.broadcast)
  • Re: Can anybody explain Progressive-PAL please?
    ... >>> and luma information overlapping in same the way that PAL and NTSC ... >> probably not - but its years since I worked with Secam. ... >> being FM should avoid cross-colour problems. ... > onto the subcarrier. ...
    (uk.tech.broadcast)
  • Re: Will an Aussie VHS play back on a French vhs/tv?
    ... >> My nephew asked me. ... >France uses SECAM so normally it wouldn't ... hetrodyning the subcarrier down to its lower frequency for recording, ... playback on a SECAM machine. ...
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