sp-dif crackle

braincell · Post by **braincell** » Fri Sep 20, 2002 12:31 pm

When recording into wavelab from the luna II sp-dif source module I get a lot of crackle. While monitoring the audio it sounds fine but when I play it back after recording the wave it has a lot of pops like green wood in a fire.

DJATWORK · Post by **DJATWORK** » Fri Sep 20, 2002 1:01 pm

Had you turn the Luna into SLAVE?

Is the project sample rate the same as the original signal that is being recorded?

braincell · Post by **braincell** » Fri Sep 20, 2002 4:44 pm

The rates are the the same (they set automatically anyway) It was set as the CW to be the master. When I set it for the CW to be the slave it does not get a steady sync, however I *am* getting audio with the CW as the master (which I can hear) just not able to record it without the crackle. I would think if I could hear the audio clearly from the sp-dif, I should be able to record it cleanly. This is odd.

[ This Message was edited by: braincell on 2002-09-20 17:44 ]

DJATWORK · Post by **DJATWORK** » Fri Sep 20, 2002 11:23 pm

If you record from a digital source, that digital source must be MASTER or receive a word clock signal...
Otherwise, there will be crackles and jitter...

You should set the Luna as SLAVE and choose the digital input that will be master. You have to shoose the SPdif as master.

That ocurr with wavelab ONLY when recording from SPDIF source?

[ This Message was edited by: DJATWORK on 2002-09-21 00:25 ]

braincell · Post by **braincell** » Sat Sep 21, 2002 9:55 am

Yes "ONLY when recording from SPDIF".

If it is required that I use the Luna in slave mode I can't record because the SFP does not lock on to the signal (hour glass on and off). It's odd that it would let me record any of the Luna sp-dif source while the Luna is in Master mode. You would think it would shut it off totally rather than give you a bad recording.

[ This Message was edited by: braincell on 2002-09-21 10:57 ]

DJATWORK · Post by **DJATWORK** » Sun Sep 22, 2002 11:36 pm

Some machines lets you record the signal that comes from a digital In, if its in sync or not, bot some other machines, MUTES all signal that is not syncronized.

I don´t really know what does the CW Hardware do, because I correctly sync my devices.

That happens with Wavelabs even if you choose ASIO drivers or Waev drivers? (mme or wdm)

Try to use another software to record from the SPDif IN and then you´ll know it you have to contact Steinberg Tech Support or Creamware´s...

boz_h · Post by **boz_h** » Wed Sep 25, 2002 9:52 am

You probably have already thought of this, but are you using 75ohm cables. I had the same problem with Spdif crackles and my Pulsar, I replaced my cables and the problem vanished.

Cheers

Boz

braincell · Post by **braincell** » Wed Sep 25, 2002 9:18 pm

In my case I don't know if I am using " 75ohm cables" but I can tell you that I am using a heavy duty cable designed specifically for sp-dif. I would also like to add that I did not have this problem with older versions of the Pulsar software. I think version 2.0 was the last one that worked (It was a long time ago), also I have the exact same problem if I am using the Pulsar sp-dif in or the Luna sp-dif in. I'm using the same type of shielded "digital" cable for the Pulsar sp-dif out with no problems whatsoever.

braincell · Post by **braincell** » Wed Sep 25, 2002 9:22 pm

DJATWORK:

I just read your post. I am about to try switching audio drivers in wavelab. I'll post my result in a few minutes.

braincell · Post by **braincell** » Wed Sep 25, 2002 9:50 pm

Well it seems that there are 3 choices for audio in Wavelab.

Microsoft WDM
Creamware WDM
Scope ASIO

None of them would record the audio without crackle. Switching drivers in Wavelab does not solve a basic problem that the SFP does not sync as a slave to the external SP-DIF. It's trying to sync but doesn't get a solid enough sync, hence the crackle.

Something about my system must be different from everybody elses because this doesn't seem to be a common problem although I did notice at least one other has this problem. CW support simply didn't answer my emails about this. I had hoped that future updates to the platform would fix it but they didn't. This is sad for me.

[ This Message was edited by: braincell on 2002-09-25 22:51 ]

DJATWORK · Post by **DJATWORK** » Wed Sep 25, 2002 9:54 pm

Are you trying to record from a tape digital source?? (ADAT or DAT maybe?)

Is that machine good capable for clocking?
Does the tape have any scratch or something?

braincell · Post by **braincell** » Wed Sep 25, 2002 11:00 pm

It's an MD recorder and it worked fine before. I have tried different disks.

It just occured to me that I might be using a mini stereo male to two stereo female outs rather than a stereo to two mono outs on the Luna. Could this be my problem?

I have to buy a new y-cable or adaptor to try this. Does anyone know for sure if this is the problem?

braincell · Post by **braincell** » Wed Sep 25, 2002 11:05 pm

Woops it is a stereo male to two stereo females. That might be the problem.

braincell · Post by **braincell** » Wed Sep 25, 2002 11:09 pm

Have to go to the store tomorrow and buy a new y-cable or adaptor and see if it fixes it.

[ This Message was edited by: braincell on 2002-09-26 00:10 ]

braincell · Post by **braincell** » Thu Sep 26, 2002 12:51 pm

Got the mini stereo to two mono adaptor and that did not solve the problem. Still bad sync. I can't think of anything else to try.

DJATWORK · Post by **DJATWORK** » Thu Sep 26, 2002 1:22 pm

Wait a minute!!!
What´s going on here?

"MINI" stereo male?

Havn´t you got RCA Coaxial connections?

braincell · Post by **braincell** » Thu Sep 26, 2002 1:51 pm

The Luna has a mini female phone plug for the sp-dif i/o.