IPB

Welcome Guest ( Log In | Register )

 
Reply to this topicStart new topic
RME 9632 Windows 7 no longer bit perfect
simonind
post Dec 17 2012, 13:51
Post #1





Group: Members
Posts: 3
Joined: 17-December 12
Member No.: 105227



Having sat down to listen to music for the first time in ages I noticed that I am no longer getting bit perfect output from my RME card. I'm not sure what has happened, I'm guessing some sort of Windows update, but I couldn't see anything wrong last night.

I'm using the WASAPI interface in Widows 7 x64, co-axial S/PDIF out and tried both XBMC and Foobar2000 to play Apple Lossless files. I have a Natalie Merchant album (Ophelia) which is HDCD encoded and therefore I know all is well as the little light comes on on my DAC. Last night it was sometimes on using XBMC and didn't come on at all when playing through Foobar.

Everything still sounds fine but I know it should be able to pass a bit perfect stream to the DAC so I'm puzzled as to why this is no longer the case.

Has anyone else experienced this or got any advice on how I can get back to where I was?

Thanks
Simon

Go to the top of the page
+Quote Post
DVDdoug
post Dec 17 2012, 18:56
Post #2





Group: Members
Posts: 2534
Joined: 24-August 07
From: Silicon Valley
Member No.: 46454



QUOTE
Having sat down to listen to music for the first time in ages I noticed that I am no longer getting bit perfect output from my RME card...

.... I know all is well as the little light comes on on my DAC.
And you think the red light means "bit perfect"? I don't think is possible for the DAC to know if the S/PDIF stream contains bit-perfect data or not. (It would know if it's uncompressed PCM or Dolby AC3, if the DAC can handle compressed files.)
Go to the top of the page
+Quote Post
bryant
post Dec 17 2012, 19:50
Post #3


WavPack Developer


Group: Developer (Donating)
Posts: 1290
Joined: 3-January 02
From: San Francisco CA
Member No.: 900



QUOTE (DVDdoug @ Dec 17 2012, 09:56) *
And you think the red light means "bit perfect"? I don't think is possible for the DAC to know if the S/PDIF stream contains bit-perfect data or not.

Because the HDCD info is encoded into the LSB of the PCM stream, it actually is a very good way to verify a "bit perfect" stream because basically any modification of the audio scrambles the LSB.
Go to the top of the page
+Quote Post
A_Man_Eating_Duc...
post Dec 17 2012, 19:52
Post #4





Group: Members
Posts: 925
Joined: 21-December 01
From: New Zealand
Member No.: 705



Sorry to go on a tangent here,

Why wouldn't you use the DAC on the soundcard instead of SPDIF to an amp?

Wouldn't the DAC on this soundcard be extremely good?




--------------------
Who are you and how did you get in here ?
I'm a locksmith, I'm a locksmith.
Go to the top of the page
+Quote Post
bryant
post Dec 17 2012, 20:00
Post #5


WavPack Developer


Group: Developer (Donating)
Posts: 1290
Joined: 3-January 02
From: San Francisco CA
Member No.: 900



More recent versions of Foobar2000 have built-in HDCD detection and will convert to 24-bit. I'm not sure if this is standard or by default, but if it was happening it would certainly explain the light being off.
Go to the top of the page
+Quote Post
simonind
post Dec 17 2012, 21:29
Post #6





Group: Members
Posts: 3
Joined: 17-December 12
Member No.: 105227



I've got a TAG AV32R for surround duties and that's a fairly handy DAC, and a Cambridge Isomagic (if anyone remembers them) for audio - this has the HDCD light. The Cambridge has an onboard clock with a sync output which I can slave the RME's S/PDIF to, in theory reducing/removing jitter. Either way in the past they've both sounded better than the RME's analogue out.

I'll check Foobar to see if I can find any mention of HDCD.

There's still something odd going on, and I've bot changed anything so this does seem odd,
Go to the top of the page
+Quote Post
simonind
post Dec 18 2012, 00:40
Post #7





Group: Members
Posts: 3
Joined: 17-December 12
Member No.: 105227



It's WASAPI up to no good.

I just installed ASIO support in Foobar and sure enough, HDCD is and therefore bit-perfect playback is steady as a rock.

So now I just need to get it into XBMC and I'm back to where I started, except perhaps using ASIO will protect me from more 'updates'

Thanks for being a sounding board guys

Simon
Go to the top of the page
+Quote Post
Porcus
post Dec 18 2012, 17:04
Post #8





Group: Members
Posts: 1842
Joined: 30-November 06
Member No.: 38207



QUOTE (bryant @ Dec 17 2012, 20:00) *
More recent versions of Foobar2000 have built-in HDCD detection and will convert to 24-bit. I'm not sure if this is standard or by default, but if it was happening it would certainly explain the light being off.


HDCD requires http://www.foobar2000.org/components/view/foo_hdcd .


--------------------
One day in the Year of the Fox came a time remembered well
Go to the top of the page
+Quote Post

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 July 2014 - 11:21