---------------------------------------------------------- XDP4000X-List Digest Archive --- Total Messages Posted Fri 10/21/05: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 11:00 PM - Sony mobile ES optical inputs, GNUnilink, etc (Ethan) ________________________________ Message 1 _____________________________________ Time: 11:00:25 PM PST US From: Ethan Subject: XDP4000X-List: Sony mobile ES optical inputs, GNUnilink, etc --> XDP4000X-List message posted by: Ethan 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