HDCD: Does anyone know how to decode it - diyAudio
Go Back   Home > Forums > Source & Line > Digital Line Level

Digital Line Level DACs, Digital Crossovers, Equalizers, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 6th March 2014, 06:23 AM   #1
diyAudio Member
 
Join Date: Jan 2014
Default HDCD: Does anyone know how to decode it

Hi, I've finished building a high quality DAC with it's own digital filter (in an fpga) and would like to decode HDCD. I've found all the patents, but they don't show how the exact encoding on the cd is done.

Does anyone have the exact encryption of the 'silent code' (what prbs is used, and how the command structure looks like) and the peak/low end extension functions (characteristics)? It must exist somewhere, but I cannot find it up till now.

Thanks for your help!

Hans R
  Reply With Quote
Old 6th March 2014, 02:23 PM   #2
Eldam is offline Eldam  France
diyAudio Member
 
Join Date: Sep 2012
Location: At home
Hi maybe in the HDCD opensoftware plugins for soft like Foobar, as it's open you can read the code and extract it ?

Maybe a fellow like Soundcheck which use Linux and all its subtilities with audio know the place where you can find what you are looking for ?
  Reply With Quote
Old 6th March 2014, 05:00 PM   #3
diyAudio Member
 
NorthStar's Avatar
 
Join Date: Oct 2012
Location: Vancouver Island, British Columbia - Canada
You don't need an HDCD decoder/filter chip for that; the Pacific Microsonics PMD-100 or PMD-200 chip from Microsoft?
__________________
~ Bob ~ Test Only Ω
  Reply With Quote
Old 6th March 2014, 05:44 PM   #4
Eldam is offline Eldam  France
diyAudio Member
 
Join Date: Sep 2012
Location: At home
Oh Yes, are you saying that HDCD is patented and can be only found in chips like the old excelent Pacific ones (out of stock nowadays ?) ?

Few days ago I saw on Foobar.org some plugins to read HDCD with Foobar. So my meaning is we are in open Linux world here and if you understand the code of the HDCD plugin ( which is free to obtain I suppose) you can program the DSD Sharc (not in Linux but abstract the datas of HDCD codec?).

Do you mean you need the reader (if non having the original disc recording in HDCD) and a HDCD chip before the DAC chip even in DIY (without paying the patent when you buy a Pacific Microsonics chip ?)

I supose than if you are able to read from a computer that means you was able to read it then rip it in wav, flac.... and then maybe no need of the decoder (soft or chip) in the electronic side of the DAC ?

Please, what do you wanted to mean Northstar ?
  Reply With Quote
Old 6th March 2014, 06:02 PM   #5
diyAudio Member
 
NorthStar's Avatar
 
Join Date: Oct 2012
Location: Vancouver Island, British Columbia - Canada
I only asked one question. ... ? That was the sign used @ the end of my short phrase.

You, you have way more questions though.
__________________
~ Bob ~ Test Only Ω
  Reply With Quote
Old 6th March 2014, 06:14 PM   #6
Eldam is offline Eldam  France
diyAudio Member
 
Join Date: Sep 2012
Location: At home
Please don't tell me what is a ?... just give up that !

I was more focusing of the sense behind it and try to understand the meaning of Microsoft with Microsonics... you make short I understood you wanted highlight something with a word-game !

Yo know sometimes a big ? is more powerfull than ?² x ?²....
  Reply With Quote
Old 6th March 2014, 06:51 PM   #7
diyAudio Member
 
NorthStar's Avatar
 
Join Date: Oct 2012
Location: Vancouver Island, British Columbia - Canada
You sir are not the type of people who I like to associate with; you are way too twisted in your head!

Ha!

* Friendliness is not part of your curriculum vitae.
__________________
~ Bob ~ Test Only Ω

Last edited by NorthStar; 6th March 2014 at 07:00 PM. Reason: *
  Reply With Quote
Old 6th March 2014, 08:26 PM   #8
Eldam is offline Eldam  France
diyAudio Member
 
Join Date: Sep 2012
Location: At home
Pfffffffff,

You seem to adore judging people, make lessons... too bad. Just asked humble questions to you.

Well I am happy you understand after your bad : "hé you can not read, bla bla what I wrote bla bla, it's a "?" bla bla" .... that you was not invited to be associated with me !
  Reply With Quote
Old 6th March 2014, 10:59 PM   #9
diyAudio Member
 
Join Date: Dec 2007
Many words, little information.

hanzablast, a guy on the doom9 forum released a software HDCD decoder. The discussion is here -
HDCD Software Decoder - Doom9's Forum
and the latest downloads are here -
Index of /
As well as Windows executables, there are some dev files available.
  Reply With Quote
Old 6th March 2014, 11:03 PM   #10
kevinkr is offline kevinkr  United States
diyAudio Moderator
 
kevinkr's Avatar
 
Join Date: Sep 2004
Location: Boston, Massachusetts
Blog Entries: 6
Some civility here folks or infractions they will be rolling in your direction. Northstar you might also want to make allowances for the fact that English is not everyone's native language. You have been warned.
__________________
"Extraordinary claims require extraordinary evidence." - Carl Sagan
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
DS/D Decode-1 dac? sharpi31 Digital Source 3 29th September 2011 09:48 PM
***** HDCD **** poynton Digital Source 12 8th September 2011 06:14 AM
No more HDCD with iTunes Aramys Digital Source 20 5th May 2008 10:04 AM
Any chips out there can decode SPDIF without a DAC? AkkerKid Digital Source 4 21st March 2008 11:23 AM
Doppler encode/decode Bill F. Multi-Way 3 8th January 2002 10:22 PM


New To Site? Need Help?

All times are GMT. The time now is 03:37 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2