Variable Sample rate clock as a varispeed control in DAW?

Poolhouse · 14th May 2005

I hope this is the place to post this...

Is this as simple as it seems? Can you just manually vary the sample
rate of a master clock and get, in effect, a varispeed control for a
multitrack DAW? Certainly playing back a 96k recording at 88.2k slows
and lowers the pitch (approx. a whole-step) so it should be that
simple. Are there issues of additional jitter or other sorts of
distortion of the clock signal? Finally, does anyone make a clock with
manually variable sample rate?

TIA

**DrDeltaM** · 14th May 2005

Yes, this is possible. I know RME cards do this and Lynx pretty sure as well. Probably others too, but can't say for sure.

Poolhouse · 15th May 2005

I actually use a pretty extensive RME rig and since I clock it with the first ADI-8ds the only choice I have is a 44.1/48k button. I'll look through the Digiface documentation to see what I can do with that as the master.

**DrDeltaM** · 15th May 2005

Here's the info about RME's 'SteadyClock': http://www.rme-audio.com/english/tec...teadyclock.htm

Seems it's only available in recent models: ADI-648, HDSP 9632, HDSP MADI, ADI-2, ADI-4 DD and Fireface 800

Poolhouse · 17th May 2005

I went looking and I'll post a Q in the RME forum but it looks like the new clock is still only selctable between the old favorites. Thanks though...

Anybody else?

jabney · 17th May 2005

hi poolhouse,

Are you using a Hammerfall card with a 9-pin ADAT sync in port? If so, you might pick up an Alesis BRC on ebay and control its bnc word-clock-in with your RME ADI DS's clock-out and the sound card with the BRC's ADAT 9-pin sync. The BRC re-clocks through a PLL and lets you vary the clock speed coming out of it.

Will it work for you? I don't know. It would for me, but I have CreamWare Scope and Pulsar cards that have analog outs as well as ADAT outs, so if my RME AEs choked on the weird speeds, I could always fall back on analog ins and outs. Be aware, the BRC is old technology, and won't work above 50k.

theother · 17th May 2005

I vari-speed my setup (RME 9652 and Apogee AD/DA-16-X's) with the Apogee Big Ben.

Before that I used a Sony professional CD player with vari speed and synced the rig from the AES/EBU output. Of course the quality of the Apogee is much much better.

14th May 2005	#1
Poolhouse Gear interested Joined: Mar 2005 Location: Boulder, CO Posts: 19 Thread Starter	Variable Sample rate clock as a varispeed control in DAW? I hope this is the place to post this... Is this as simple as it seems? Can you just manually vary the sample rate of a master clock and get, in effect, a varispeed control for a multitrack DAW? Certainly playing back a 96k recording at 88.2k slows and lowers the pitch (approx. a whole-step) so it should be that simple. Are there issues of additional jitter or other sorts of distortion of the clock signal? Finally, does anyone make a clock with manually variable sample rate? TIA

14th May 2005	#2
DrDeltaM Moderator Joined: Sep 2003 Location: Belgium Posts: 4,347	Yes, this is possible. I know RME cards do this and Lynx pretty sure as well. Probably others too, but can't say for sure. __________________ Mathijs Indesteege aka Mathew Lane mixing - mastering - audio restoration - plugins http://www.mathewlane.com DrMS. Focus on your stereo field. - NEW v3.2 OUT NOW! DrMS spatial processor - native RTAS/AU/VST plugin » Digital Audio Product Support Joystick Audio - Benelux High End Distributor http://www.joystick.be

17th May 2005	#6
jabney Gear addict Joined: May 2004 Posts: 450	hi poolhouse, Are you using a Hammerfall card with a 9-pin ADAT sync in port? If so, you might pick up an Alesis BRC on ebay and control its bnc word-clock-in with your RME ADI DS's clock-out and the sound card with the BRC's ADAT 9-pin sync. The BRC re-clocks through a PLL and lets you vary the clock speed coming out of it. Will it work for you? I don't know. It would for me, but I have CreamWare Scope and Pulsar cards that have analog outs as well as ADAT outs, so if my RME AEs choked on the weird speeds, I could always fall back on analog ins and outs. Be aware, the BRC is old technology, and won't work above 50k. __________________ doggedly determined contributor to the song glut

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread starter	Forum	Replies	Last Post
Best clock for varispeed	jacob	So much gear, so little time!	1	12th November 2005 05:07 AM
Sample Rate	A Fak	Rap + Hip Hop engineering & production	8	9th November 2005 10:49 AM
Sample rate conversion	Recording David	So much gear, so little time!	11	12th March 2005 10:18 PM
Sample Rate	Sanford	So much gear, so little time!	11	29th March 2004 06:22 PM
Master clock for outputting 1/2 sample rate?	Mike H	High end	3	24th February 2004 08:54 PM

15th May 2005	#3
Poolhouse Gear interested Joined: Mar 2005 Location: Boulder, CO Posts: 19 Thread Starter	I actually use a pretty extensive RME rig and since I clock it with the first ADI-8ds the only choice I have is a 44.1/48k button. I'll look through the Digiface documentation to see what I can do with that as the master.

17th May 2005	#7
theother Lives for gear Joined: Dec 2004 Location: London, UK Posts: 2,089	I vari-speed my setup (RME 9652 and Apogee AD/DA-16-X's) with the Apogee Big Ben. Before that I used a Sony professional CD player with vari speed and synced the rig from the AES/EBU output. Of course the quality of the Apogee is much much better.