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After pulling the "I2S" signals out of a computer CDROM, and not getting any sound after connecting the 3 signals to Metro, I decided to read the spec and do some experimentation. Switched the input mode to "Right Justified, 16 bit" and voila! Music... Thanks TPA's Brian and Russ! (Now I need to figure out a easy way to switch between 24bit I2S and RJ-16bit)
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Excellent work!
Its time you harnessed the incredible power of the microcontroller. That would be the easiest way to do what you need. :)
Cheers!
Russ
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Would it be hard to adapt the AC1 to control a CD-Rom drive and extract the I2S directly into either the buffalo/opus. Be interesting if we could get the AC1 to display track info and everything and have a FF/RW and Skip controls. Guessing we'd have to write our own firmware even if there was a way to do it. Not sure what's involved in writing FW for the AC1.
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I purchased a controller kit from the vendors section in diyaudio. By "extracting" the "I2S" signal I meant I looked up the datasheet of the controller chip and noticed that it had an audio output in the form for of LRClock, BClock and Digital Data. I figured this is the same as I2S. Then I soldered wires to traces/vias and routed them out the analog plug in the back of the CDROM (perfect since it has 4 pins). I reused the analog CDROM cable you find in computers since it has 3 signal cables and a ground shield and connected the signal wires to the appropriate location in Metro. I later figured that OPUS can also be configured to accept 16-bit right justified, but I already had the Metro in the stack. Edit: Now that I think about it, even though OPUS can accept 16-bit right justified data, I still did not have a clock (master clock?) signal since I did not know where to pull it off the controller chip, so Metro was the only solution. Here is a picture: http://picasaweb.google...._Qdg?authkey=XPCnSxjQnD8Edited by user Tuesday, December 16, 2008 1:07:25 PM(UTC)
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Rank: Administration
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Joined: 10/24/2006(UTC)
Posts: 3,979
Location: Nashville, TN
Thanks: 25 times
Was thanked: 89 time(s) in 83 post(s)
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Dougie085 wrote:Would it be hard to adapt the AC1 to control a CD-Rom drive and extract the I2S directly into either the buffalo/opus. Be interesting if we could get the AC1 to display track info and everything and have a FF/RW and Skip controls. Guessing we'd have to write our own firmware even if there was a way to do it. Not sure what's involved in writing FW for the AC1. I think it is possible, but i have not looked very closely. I would have to know the protocol the CD-Rom speaks. :)
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Rank: Administration
Groups: Administration, Customer
Joined: 10/24/2006(UTC)
Posts: 3,979
Location: Nashville, TN
Thanks: 25 times
Was thanked: 89 time(s) in 83 post(s)
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glt wrote:I purchased a controller kit from the vendors section in diyaudio. By "extracting" the "I2S" signal I meant I looked up the datasheet of the controller chip and noticed that it had an audio output in the form for of LRClock, BClock and Digital Data. I figured this is the same as I2S. Then I soldered wires to traces/vias and routed them out the analog plug in the back of the CDROM (perfect since it has 4 pins). I reused the analog CDROM cable you find in computers since it has 3 signal cables and a ground shield and connected the signal wires to the appropriate location in Metro. I later figured that OPUS can also be configured to accept 16-bit right justified, but I already had the Metro in the stack. Here is a picture: http://picasaweb.google...._Qdg?authkey=XPCnSxjQnD8 That is a very very cool mod! Nice work!
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Rank: Advanced Member
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I agree, I think I'm going to have to order one of the little kits :) 38 bucks to my door is not bad.
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