Ralph Metzler wrote:
>Stephen R. van den Berg writes:
> > the BT848_COLOR_FMT_RAW VBI frame outputmode.
> > The Conexant PDF files only talk about "RAW 8X Data".
>"Raw 8x data" data is the raw composite signal sampled at the full
>sampling frequency of the Bt848 (~35MHz for PAL).
Interesting. Is this so obvious in TV-technology circles that they
don't feel the need to document this anywhere?
Or do you have access to documentation not everyone has?
>Just write the necessary frequency filters and extract the color information.
>The Bt848 data sheet shows the filters which are used in non-raw modes.
Somewhat, yes. A quick glance seems to indicate that the actual processing
power needed to perform this filtering is too large for real-time
postprocessing using regular Pentium-233 MMX like technology.
>But I think the raw data is only really useful if you want to sample
>VBI data or maybe for high quality still pictures.
Evidently, since filtering in software is prohibitively expensive.
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Sincerely, [EMAIL PROTECTED]
Stephen R. van den Berg (AKA BuGless).
"<Clarions sounding> *No one* expects the Spanish inquisition!"
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