5.1 to 2.0 digital converter? - diyAudio
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Old 26th May 2011, 12:56 AM   #1
rx7691 is offline rx7691  United States
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Default 5.1 to 2.0 digital converter?

Hi all.

I have built a DAC using a dir9001 decoder and a TDA 1543A 16-bit DAC IC to convert the audio from my TV to analog for my old stereo system. Unfortunately, it can only convert 2 channel digital, not 5.1. I am gettin my TV via OTA, and the only audio output on the TV is TOSLINK, the reason for my project.

Sadly, I can not change the audio output format on my TV from 5.1 to 2 channel PCM (dumb, right!?) so my DAC doesnt work. It works for my CD player, and my DVD player when I choose stereo output, so I know it's not my DAC.

My main question, is if anybody knows of a product to convert 5.1 to 2 channel PCM for me to use between my TV and my DIY DAC... I've read alot of places that dolby has a lot of licensing on the tech, so it may be near impossible to get a chip for me to build a DIY....any inputs or ideas?

Again, unfortunately, my TV will ONLY output 5.1 when gettin OTA signals. I can hook my DVD player through the TV, pull the audio out from the TV, and my DAC works because I am able to choose stereo on the DVD player. I am quite sad right now. Any help would be awesome.

Ken
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Old 26th May 2011, 12:23 PM   #2
frenzic is offline frenzic  Netherlands
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I am thinking that it should be possible to hook up an external tuner. There should be models that have a regular stereo analogue output besides the ac3/digital crap digital out. Did not research this but that would be my starting point.
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Old 26th May 2011, 12:30 PM   #3
frenzic is offline frenzic  Netherlands
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I see now you wanted digital out, in that case I would put a computer in between and use the sound cards outputs set to 2channel mode.
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Old 26th May 2011, 02:10 PM   #4
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There where HD tunners that had this conversion included in options... But wheren't the cheap SD, "rebate" ones.

I would look into an used digital receiver in a thrift store/cash converters/pawn store. That DAC that you have (with TDA1543) is not such a great DAC to begin with...

Last edited by SoNic_real_one; 26th May 2011 at 02:15 PM.
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Old 26th May 2011, 04:03 PM   #5
rx7691 is offline rx7691  United States
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ok, thanks for the input I was keeping my eye open at the reuse stores, but havent seen any yet


Ken
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Old 26th May 2011, 06:53 PM   #6
rx7691 is offline rx7691  United States
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Join Date: Apr 2011
Location: Eugene, Oregon
Hey, does anybody have any experience with this DAC IC? The WM8746?
DACs | WM8746 | Wolfson Microelectronics
IT says it is a 6-channel DAC, and I was thinking maybe I could use this. My TV manual says it puts out 5.1CH audio via TOSLINK, not specifying that it is Dolby. Since it is not Dolby, I don't have to find some ridiculously expensive IC to handle Dolby.
Any feedback would be great.

Ken
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