Archived from groups: alt.video.laserdisc (
More info?)
The DVL-909 is basically a CLD-D604 with a DV-505 DVD player inside and a
fancy mechanism to house the 604 and 505 pickups. The DVL-909 service
manual even states on the cover to refer to the DV-505 service guide for IC
information descriptions.
The LD signal is FM demodulated to composite analog, then goes to IC500
(D-Video Processor) on the CLDM board where it is digitized to an 8-bit
composite signal. It is then fed to the MYCB board to IC101 which is a
Pioneer design where the TBC/Digital Memory/ DVNR happens and then the 8-bit
signal is passed to IC301 which is the 3D comb Filter. The Analog Y/C
signals from that is fed to IC620 which is a relay that selects to output
the LD or DVD signal.
The DVD signal goes to the DVDM board and the Y/C is sent to the IC620 relay
on the MYCB board to output the DVD Y/C signal. Or if you have the
Component output enable the Y/Cr/Cb signal goes to the MYCB board and
immediately loops out to the ACVB board which are the terminal outputs(the
LD section has NO path to this output at all).
Now the Audio Section uses the same D/A's.
So as others are trying to tell you, the DVL series machines are actually
two separate players in one case Video wise. The only common circuitry is
the power supply and the common buffer output stages.
BTW, the composite signal is formed by mixing the Y/C signals you have
selected to output so in theory the Y/C should be a cleaner LD picture.
You are reading more in this than there is, what you are describing is not
there!! The LD section does not even have any separate Y/C signals you can
tap out in a digital domain, only signal available is the 8-bit parallel
composite. The board on top processes the DVD signals and the boards on the
bottom process the LD signals and the two shall never meet until output
selection and buffering. I'd suggest taking the Analog immediately after
the FM demodulation, but then again this would be a CLD-S201 and you didn't
like that suggestion.
Kurtis
"NEWman" <koREMOVETHISteANDTHIStsu@libero.it> wrote in message
news:d2l2h15q3f25mpfn7pupb96as3r8pgfash@4ax.com...
> On Sat, 27 Aug 2005 17:38:11 -0400, "Steve(JazzHunter)"
> <jazzhunterNotHere@internet.com> wrote:
>
>>Laserdisc, like C-format and Quad tape, (but not home consumer formats
>>or Betacam etc.) has the video recorded as composite. Period.
>
> Why do you people still insist on that point??????
> Nobody says the disc contains component data, what I'm TRYING to say
> is this: since the signal *IS* subject to some elaboration before
> going out there should be an advantage in tapping the signal before
> the last step.
>
> I have a question: how do the V-DNR, Freeze frame and "special
> effects" for CLV discs work?
> Don't you think that at some point there should be an AD conversion?
> Don't you think that to do that, the composite signal should be at
> least separated in Chroma and Luma parts?
>
> Then comes the theoretical part regarding the output:
> Since the unit, besides being an LD player, is ALSO a DVD player don't
> you think that maybe would be logical to use the same DA conversion
> circuit that is being used for the DVD?
>
>>Outputting the compsite to the TV then
>>using the TV to detect the colour has the same number of steps as
>>demodulating to RGB at the player and outputting that to an RGB
>>monitor.
>
> I disagree, we are speaking about a DVL 909 here, this unit doesn't
> have an unadulterated composite signal on the output plug.
>
>
/www.bde.de/rgb.htm
Facebook
Twitter