5.1 to 2.0 digital converter?

rx7691 · 25th May 2011, 11:56 PM

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

frenzic · 26th May 2011, 11:23 AM

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.

frenzic · 26th May 2011, 11:30 AM

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.

SoNic_real_one · 01:15 PM

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...

rx7691 · 26th May 2011, 03:03 PM

ok, thanks for the input

I was keeping my eye open at the reuse stores, but havent seen any yet

Ken

rx7691 · 26th May 2011, 05:53 PM

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

25th May 2011, 11:56 PM	#1
rx7691 diyAudio Member Join Date: Apr 2011 Location: Eugene, Oregon	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

26th May 2011, 01:10 PM	#4
SoNic_real_one diyAudio Member Join Date: Jan 2008 Location: Virginia	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 01:15 PM.

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26th May 2011, 11:23 AM	#2
frenzic diyAudio Member Join Date: May 2003 Location: http://www.last.fm/user/frenzicatlast	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.

26th May 2011, 11:30 AM	#3
frenzic diyAudio Member Join Date: May 2003 Location: http://www.last.fm/user/frenzicatlast	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.

26th May 2011, 03:03 PM	#5
rx7691 diyAudio Member Join Date: Apr 2011 Location: Eugene, Oregon	ok, thanks for the input I was keeping my eye open at the reuse stores, but havent seen any yet Ken

26th May 2011, 05:53 PM	#6
rx7691 diyAudio Member 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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