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1. 11:00 PM - Sony mobile ES optical inputs, GNUnilink, etc (Ethan)
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| Subject: | Sony mobile ES optical inputs, GNUnilink, etc |
--> XDP4000X-List message posted by: Ethan <telmnstr@757.org>
Hello all,
A few months ago I purchased an el-cheapo mobile DVD player to hook to my
XT-40V, DSP210EQ and MD-8900. I tested a el-cheapo home DVD player on an
inverter and it worked okay.
The unit I picked (TView) had EVERYTHING I wanted. Remote sensor, small
enough, slot load... I'm fairly happy with it with one really bad
exception. Audio quality. It's bad. I've tracked it down, and the output
from the DAC seems to be fine, but the JRC opamp output has distortion.
Everything is surface mount, so changing the values of the bias resistors
would be a horrible hassle. I'm guessing it's engineering error, but maybe
mine is defective (Model 1005 I think).
The unit features a SPDIF output. I could easily add a TOSLINK output, I
even have spare LED transmitter modules in a drawer. This would allow me
to connect the DVD player to the 210EQ, assuming I could get the digital
input to go active.
A while ago I was looking into this, and I realized I could hook a
Phillips DVD player to my Minidisc deck, and as long as the video wasn't
in the dolby mode I believe I was able to get audio (5.1 versus
2 channel?).
So my train of thought is to try to get the GNUnilink adaptor working in
place of my analog CD changer. If I can get the device built and in place,
I can log the data bus and contribute much information to the Unilink
hackers, such as 210EQ operation and XT-40v operation. Also, if I can come
up with schematics to my CD changer I should be able to modify it so that
it becomes a higher model that supports optical output by shorting out the
one controller chip pin that tells the bus controller IC it's in digital
mode. With this byte it should be possible to get GNUnilink to emulate the
digital changer, thus making the digitial input availible.
One question though. Is the 210EQ optical input standard TOSLINK 2
channel? The schematic for the 210EQ shows a sample rate converter, so I'm
assuming (which can be bad) that it's a full implementation of a TOSLink
interface? The TOSLink input in the 210EQ immediately hits an IC with
microcontroller control so my idea of perhaps swapping the internal data
from the digital input and analog input (past the DAC) when the DVD player
is on is no good. I'm guessing that the digital inputs will be turned off
under microcontroller control (but not 100% positive).
Has anyone with a Sony optical car changer ever tried to plug another
device (minidisc player, dvd player, etc) into the optical input on the
210EQ while the CD player was playing? If so, could you share your
results?
The last issue is that sitting on CD changer to get DVD audio will cause
the TVs to all sit on the blue screen showing the blank track information.
My fix for this is to have the remote output (like an amp output) switch
the video input to the screens from the XT-40V to the DVD player when the
DVD player is on.
Any insight would be appreciated!
--
// Ethan O'Toole
// http://users.757.org/~ethan
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