IPB

Welcome Guest ( Log In | Register )

Extract HDCD, How I Can extract HDCD by software?
SCIF
post Jan 27 2005, 08:34
Post #1





Group: Members
Posts: 5
Joined: 26-January 05
From: Vladivostok(RU)
Member No.: 19324



How I Can extract HDCD by software(EAC, WMP9...)?
Go to the top of the page
+Quote Post
 
Start new topic
Replies
Eric Carroll
post Feb 26 2007, 06:56
Post #2





Group: Members
Posts: 5
Joined: 26-February 07
Member No.: 40971



There has been a long running thread on the Slim Devices Audiophile forum where we have been working to decode HDCDs so we could play them back on our Squeezeboxen and Transporters. Best to read the thread backwards, its now 11 pages long!

We have reached the point where we definately have made progress. Using Windows Media Player 9, we can get the HDCD icon to light up, and we have successfully recorded bits using the Chronotron WAV Plugin for WMP9 (using a 24b audio card and the 24b option enabled).

The issue at hand is if the plugin is actually recording 20b and writing a 24b WAV (actually its WAVEX format) or just recording 16b and padding zeros to 24b.

The only other alternative I have found to date is to use Virtual Audio Cable (VAC) to see if it gets the same result as the plugin or something different. I have not yet tried this option.

If there is someone here who really understands HDCD, what is the expected result when comparing a 16b rip to a 24b WAV capture via WMP9? What should the waveforms look like if the decoder worked and the plugin actually captured 20b? Personally I would have expected increased dynamic range in accordance with the increased bit depth, and an unwinding of any range compression. So I should see spikier peaks and higher peak to average. Yes?

Here is my comparison of the 16b rip and the 24b capture:
The 16b rip is the trace on top and the 24b is the trace on the bottom. Closer inspection shows the peaks in the 24b capture are exactly 6dB down from the 16b capture. However, the peak to average seems about the same, thus the dynamic range did not increase. This suggests we don't actually have the HDCD decode captured.

This post has been edited by Eric Carroll: Feb 26 2007, 07:03
Go to the top of the page
+Quote Post

Posts in this topic
- SCIF   Extract HDCD   Jan 27 2005, 08:34
- - Garf   HDCD just uses the standard 16 bit CD Audio encodi...   Jan 27 2005, 10:28
|- - PoisonDan   QUOTE (Garf @ Jan 27 2005, 11:28 AM)For playb...   Jan 27 2005, 10:50
|- - SCIF   QUOTE (PoisonDan @ Jan 27 2005, 07:50 PM)But ...   Jan 28 2005, 03:31
- - Garf   Perhaps it could work when you mount the ripped wa...   Jan 27 2005, 11:44
- - precisionist   QUOTE (SCIF @ Jan 28 2005, 03:31 AM)QUOTE (Po...   Jan 28 2005, 11:17
|- - SebastianG   QUOTE (precisionist @ Jan 28 2005, 02:17 AM)M...   Jan 28 2005, 17:02
- - adlai   I was always under the impression that HDCD was si...   Jan 28 2005, 18:00
|- - SebastianG   QUOTE (adlai @ Jan 28 2005, 09:00 AM)I was al...   Jan 28 2005, 18:59
|- - krabapple   QUOTE (SebastianG @ Jan 28 2005, 13:59) Q...   Jun 27 2007, 20:44
|- - ProtectYaNeck36   QUOTE (SebastianG @ Jan 28 2005, 11:59) Q...   Oct 20 2007, 17:41
- - user   QUOTE (SCIF @ Jan 27 2005, 08:34 AM)How I Can...   Feb 1 2005, 11:31
|- - Night Rain   QUOTE (user @ Feb 1 2005, 02:31) QUOTE (S...   Mar 21 2007, 12:38
- - ShowsOn   I just noticed this thread, and given that I fina...   Feb 1 2005, 13:10
|- - user   as written above, normally 24 bit playback of audi...   Feb 1 2005, 13:45
- - precisionist   QUOTE (ShowsOn @ Feb 1 2005, 01:10 PM)I resta...   Feb 2 2005, 13:26
|- - user   QUOTE (precisionist @ Feb 2 2005, 01:26 PM)My...   Feb 3 2005, 12:02
|- - Pio2001   QUOTE (user @ Feb 3 2005, 01:02 PM)QUOTE (pre...   Feb 3 2005, 21:25
- - precisionist   QUOTE (Pio2001 @ Feb 3 2005, 09:25 PM)QUOTE (...   Feb 4 2005, 14:23
|- - SebastianG   QUOTE (precisionist @ Feb 4 2005, 05:23 AM)Th...   Feb 4 2005, 16:34
- - Pio2001   No software, exept maybe the combination of Window...   Feb 4 2005, 23:29
|- - krabapple   QUOTE (Pio2001 @ Feb 4 2005, 17:29) No so...   Feb 8 2007, 19:15
- - precisionist   QUOTE (SebastianG @ Feb 4 2005, 04:34 PM)Does...   Feb 7 2005, 17:01
- - Eric Carroll   There has been a long running thread on the Slim D...   Feb 26 2007, 06:56
- - markanini   Wow, I wish I knew about this plugin before. Final...   Feb 27 2007, 01:40
|- - Eric Carroll   QUOTE (markanini @ Feb 26 2007, 19:40) Wo...   Feb 27 2007, 04:42
|- - markanini   QUOTE (Eric Carroll @ Feb 27 2007, 05:42)...   Feb 27 2007, 05:26
- - markanini   Since I got too excited about this, here are the w...   Feb 27 2007, 06:31
|- - Eric Carroll   Thanks for looking into this. QUOTE (markanini ...   Feb 27 2007, 06:57
- - markanini   For the sake of visual comparison I adjusted the w...   Feb 27 2007, 07:08
|- - Eric Carroll   Well your results sure look like what I expected t...   Feb 27 2007, 07:14
- - markanini   I used WMP 10.   Feb 27 2007, 07:17
- - SebastianG   I recall someone mentioning on the audioasylum for...   Feb 27 2007, 09:49
|- - user   I have an alternative idea to capture the 2 stream...   Mar 21 2007, 11:41
- - SebastianG   I reviewed the papers about HDCD you can find on t...   Jun 28 2007, 11:21
|- - Christopher Key   I've had a go at understanding hdcd; see, htt...   Aug 22 2007, 10:57
|- - M   QUOTE (Christopher Key @ Aug 22 2007, 04...   Aug 22 2007, 15:33
||- - Christopher Key   QUOTE (M @ Aug 22 2007, 15:33) QUOTE (Chr...   Aug 22 2007, 17:54
|- - gabeg   QUOTE (Christopher Key @ Aug 22 2007, 03...   Aug 24 2007, 01:15
||- - Christopher Key   QUOTE (gabeg @ Aug 24 2007, 01:15) QUOTE ...   Aug 24 2007, 11:03
|- - MRC01   QUOTE (Christopher Key @ Aug 22 2007, 01...   Oct 18 2007, 06:14
- - SebastianG   Nice work! ... The infos about the LFSR are av...   Aug 22 2007, 13:50
|- - Christopher Key   QUOTE (SebastianG @ Aug 22 2007, 13:50) N...   Aug 22 2007, 14:04
- - eevan   You can find this link at Wikipedia. Take a look...   Aug 22 2007, 15:29
|- - Christopher Key   QUOTE (eevan @ Aug 22 2007, 15:29) You ca...   Aug 22 2007, 16:28
- - eevan   I've just tried your command-line decoder on o...   Aug 22 2007, 17:12
- - eevan   Thanks! Cheers   Aug 22 2007, 17:58
- - SebastianG   I didn't try but I'd guess the answer is: ...   Aug 24 2007, 09:15
- - dmckean   It works for me. I think the real solution needs t...   Aug 25 2007, 01:24
|- - Christopher Key   QUOTE (dmckean @ Aug 25 2007, 01:24) It w...   Aug 25 2007, 16:42
- - SebastianG   QUOTE (Christopher Key @ Aug 24 2007, 12...   Aug 27 2007, 08:21
|- - Christopher Key   QUOTE (SebastianG @ Aug 27 2007, 08:21) Q...   Aug 27 2007, 23:17
|- - Christopher Key   QUOTE (Christopher Key @ Aug 27 2007, 23...   Aug 29 2007, 19:12
|- - krabapple   QUOTE (Christopher Key @ Aug 29 2007, 14...   Aug 30 2007, 20:20
- - Walrusbonzo   Interesting stuff, I have 20~ HDCDs around here. ...   Aug 27 2007, 09:45
|- - adamjk   QUOTE (Walrusbonzo @ Aug 27 2007, 10:45) ...   Aug 27 2007, 11:36
- - Raiden   hdcd.exe < 16bit.wav > 24bit.wav   Aug 27 2007, 12:02
- - Walrusbonzo   Thanks guys.... Got it working.   Aug 27 2007, 13:44
- - Walrusbonzo   I've started to run all my known HDCD encoded ...   Aug 27 2007, 15:20
|- - bryant   QUOTE (Walrusbonzo @ Aug 27 2007, 07:20) ...   Aug 31 2007, 05:36
|- - SebastianG   QUOTE (bryant @ Aug 31 2007, 06:36) I als...   Aug 31 2007, 08:27
||- - bryant   QUOTE (SebastianG @ Aug 31 2007, 00:27) Q...   Sep 1 2007, 05:49
|- - Christopher Key   QUOTE (bryant @ Aug 31 2007, 05:36) Chris...   Aug 31 2007, 11:55
|- - bryant   QUOTE (Christopher Key @ Aug 31 2007, 03...   Sep 1 2007, 06:14
|- - Christopher Key   QUOTE (bryant @ Sep 1 2007, 06:14) I had ...   Sep 13 2007, 13:19
- - skamp   FLAC seems to support 20 bit audio. I don't su...   Aug 27 2007, 16:38
|- - Walrusbonzo   QUOTE (skamp @ Aug 27 2007, 16:38) FLAC s...   Aug 27 2007, 17:43
- - SebastianG   One could modify the decoder to output 24 bit samp...   Aug 27 2007, 18:10
|- - Walrusbonzo   QUOTE (SebastianG @ Aug 27 2007, 18:10) S...   Aug 27 2007, 18:30
|- - skamp   QUOTE (SebastianG @ Aug 27 2007, 19:10) S...   Aug 27 2007, 18:42
||- - lucas1985   I'm with SebastianG. This decoder should be re...   Aug 27 2007, 20:09
|- - SiriusB   QUOTE (SebastianG @ Aug 27 2007, 11:10) O...   Aug 30 2007, 03:38
|- - eevan   QUOTE (SiriusB @ Aug 30 2007, 04:38) Rega...   Aug 30 2007, 11:39
||- - skelly831   QUOTE (eevan @ Aug 30 2007, 03:39) When I...   Aug 30 2007, 15:33
|- - Christopher Key   QUOTE (SiriusB @ Aug 30 2007, 03:38) Hi g...   Aug 30 2007, 16:33
|- - krabapple   QUOTE (Christopher Key @ Aug 30 2007, 11...   Aug 30 2007, 19:56
|- - Christopher Key   [quote name='krabapple' date='Aug 30 2...   Aug 31 2007, 11:37
|- - SiriusB   QUOTE (Christopher Key @ Aug 31 2007, 04...   Aug 31 2007, 12:14
||- - Christopher Key   QUOTE (SiriusB @ Aug 31 2007, 12:14) Rega...   Aug 31 2007, 12:50
|- - Christopher Key   QUOTE (Christopher Key @ Aug 31 2007, 11...   Aug 31 2007, 17:35
|- - Christopher Key   QUOTE (Christopher Key @ Aug 31 2007, 17...   Aug 31 2007, 21:52
||- - SebastianG   QUOTE (Christopher Key @ Aug 31 2007, 22...   Sep 3 2007, 12:27
||- - gabeg   QUOTE (SebastianG @ Sep 3 2007, 05:27) Pe...   Sep 4 2007, 17:31
||- - SebastianG   QUOTE (gabeg @ Sep 4 2007, 18:31) So does...   Sep 5 2007, 08:29
||- - Christopher Key   QUOTE (SebastianG @ Sep 5 2007, 08:29) QU...   Sep 13 2007, 14:13
|- - SiriusB   QUOTE If anyone has access to a hardware decoder w...   Sep 1 2007, 00:36
|- - Christopher Key   QUOTE (SiriusB @ Sep 1 2007, 00:36) QUOTE...   Sep 1 2007, 16:09
|- - skamp   QUOTE (Christopher Key @ Sep 1 2007, 17:0...   Sep 1 2007, 18:50
|- - Christopher Key   QUOTE (skamp @ Sep 1 2007, 18:50) QUOTE (...   Sep 13 2007, 14:02
- - edwardar   Can I just say I'm very excited about this too...   Aug 27 2007, 23:05
- - Dynamic   The older foobar v0.8 series do allow Playback/Bit...   Aug 28 2007, 10:06
- - SiriusB   Yes, piping makes more sense than the way I did it...   Aug 31 2007, 13:20
- - Egor   FLAC --best compression results, 1.2.0 ICL compile...   Aug 31 2007, 14:38
|- - Christopher Key   QUOTE (Egor @ Aug 31 2007, 14:38) FLAC --...   Aug 31 2007, 22:40
- - Fool_on_the_hill   I did ABX on track Wag The Dog from Mark Knopfler...   Aug 31 2007, 21:19
|- - Dynamic   QUOTE (Fool_on_the_hill @ Aug 31 2007, 21...   Sep 1 2007, 01:13
- - Triza   Excellent work. Christopher. Well done. Any chan...   Sep 1 2007, 00:34
- - Fool_on_the_hill   QUOTE Dynamic Posted Yesterday, 18:13 QUOTE(...   Sep 1 2007, 20:32
- - Dynamic   Thanks for the info, FotH. I hadn't noticed th...   Sep 2 2007, 18:37
- - Cavaille   for heavens sake!!! itīs finally happe...   Sep 6 2007, 18:55
2 Pages V   1 2 >


Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 



RSS Lo-Fi Version Time is now: 22nd October 2014 - 01:41