Project: Surround Sound decoder on an FPGA

kevpatts · 1st November 2004, 02:50 PM

Hey all, I'm new here but I think you guys could help me. I'm looking to implement a full Dolby Digital and DTS surround sound decoder on an FPGA. I'm starting from absolute scratch and I only decided to give it a try earlier today. I'm having problems finding out info on the specs and decoding algorithms for these standards. Could anyone point me in the right direction?

I'd say I'm going to need a lot of advice during the course of this project, especially on the analogue side or the circuitry. I'm gonna hopefully use this thread alot if you guys are keen to assist.

I work in the design department of leading FPGA company so that end of things I should be able to get assistance with in-house, but my main concerns are with the standards, algorithms and audio SNR.

Please post here if you're interested or have anything to offer (or if you've tried making this before!!)

rfbrw · 1st November 2004, 11:16 PM

Dolby AC3 spec. http://www.atsc.org/standards/a_52a.pdf
You can get the DTS spec from the ETSI website but it lacks the coefficients needed to make it all work.

vincentvdlocht · 2nd November 2004, 12:57 PM

Hi,

I'm also interested in a AC-3 decoder in hardware. I have been working with MPEG and Dolby AC-3 signals before. especialy muxing and demuxing but never decoded or encoded itself.

Could you keep me informed of your findings, and if you need helf please mail me .

macboy · 4th November 2004, 02:31 PM

Check out the open-source AC3Filter project. While this is a software implementation of an AC3 (Dolby Digital) decoder, it would be a good starting point, providing you with an algorithm to work with.

macboy · 4th November 2004, 05:35 PM

In addition to AC3Filter, check out the open-source libac3 and libdts. Note that libdts was re-named to libdca after DTS sent their lawyers after the developers. As a result of that, the sources are hard to come by, but can be found on Debian, here.

macboy · 8th November 2004, 02:11 PM

Given up already?
Here is a 140-page pdf courtesy of the advanced television standards concil (ATSC) that describes the ac-3 standard and the method to decode in great detail.

vincentvdlocht · 9th November 2004, 07:17 AM

I've got my platform almost ready now, so I will try to sart with making a decoder the end of this month.

Anyone who has some starting points for me, would be great.

1st November 2004, 02:50 PM	#1
kevpatts diyAudio Member Join Date: Nov 2004 Location: Dublin	Project: Surround Sound decoder on an FPGA Hey all, I'm new here but I think you guys could help me. I'm looking to implement a full Dolby Digital and DTS surround sound decoder on an FPGA. I'm starting from absolute scratch and I only decided to give it a try earlier today. I'm having problems finding out info on the specs and decoding algorithms for these standards. Could anyone point me in the right direction? I'd say I'm going to need a lot of advice during the course of this project, especially on the analogue side or the circuitry. I'm gonna hopefully use this thread alot if you guys are keen to assist. I work in the design department of leading FPGA company so that end of things I should be able to get assistance with in-house, but my main concerns are with the standards, algorithms and audio SNR. Please post here if you're interested or have anything to offer (or if you've tried making this before!!)

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1st November 2004, 11:16 PM	#2
rfbrw diyAudio Member Join Date: Oct 2001 Location: .	Dolby AC3 spec. http://www.atsc.org/standards/a_52a.pdf You can get the DTS spec from the ETSI website but it lacks the coefficients needed to make it all work.

2nd November 2004, 12:57 PM	#3
vincentvdlocht diyAudio Member Join Date: Nov 2004 Location: Beers	Hi, I'm also interested in a AC-3 decoder in hardware. I have been working with MPEG and Dolby AC-3 signals before. especialy muxing and demuxing but never decoded or encoded itself. Could you keep me informed of your findings, and if you need helf please mail me .

4th November 2004, 02:31 PM	#4
macboy diyAudio Member Join Date: Oct 2003 Location: Ottawa, Canada	Check out the open-source AC3Filter project. While this is a software implementation of an AC3 (Dolby Digital) decoder, it would be a good starting point, providing you with an algorithm to work with.

4th November 2004, 05:35 PM	#5
macboy diyAudio Member Join Date: Oct 2003 Location: Ottawa, Canada	In addition to AC3Filter, check out the open-source libac3 and libdts. Note that libdts was re-named to libdca after DTS sent their lawyers after the developers. As a result of that, the sources are hard to come by, but can be found on Debian, here.

8th November 2004, 02:11 PM	#6
macboy diyAudio Member Join Date: Oct 2003 Location: Ottawa, Canada	Given up already? Here is a 140-page pdf courtesy of the advanced television standards concil (ATSC) that describes the ac-3 standard and the method to decode in great detail.

9th November 2004, 07:17 AM	#7
vincentvdlocht diyAudio Member Join Date: Nov 2004 Location: Beers	I've got my platform almost ready now, so I will try to sart with making a decoder the end of this month. Anyone who has some starting points for me, would be great.

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