electro-music.com   Dedicated to experimental electro-acoustic
and electronic music
 
    Front Page  |  Articles  |  Radio
 |  Media  |  Forum  |  Wiki  |  Links  |  Store
Forum with support of Syndicator RSS
 FAQFAQ   CalendarCalendar   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   LinksLinks
 RegisterRegister   ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in  Chat RoomChat Room 
 Forum index » Discussion » Schmooze
Direct recording of digital audio signals
Post new topic   Reply to topic
Page 1 of 1 [5 Posts]
View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
Author Message
audiodef



Joined: Sep 05, 2011
Posts: 629
Location: Behind you
Audio files: 40

PostPosted: Fri May 11, 2012 6:45 am    Post subject: Direct recording of digital audio signals
Subject description: Bypass the D/A step?
Reply with quote  Mark this post and the followings unread

I was just reading "Principles of Digital Audio" (I've read the third edition and was reading the sixth edition for the first time) when I was struck by a thought.

After I picked myself up and reported the thought to the police for assault and battery...

Most of my synths are digital. Be they analog modeling or otherwise, just before the audio outs, the signal is already digital. The signal goes through a D/A converter, travels to my mixer, where it is then re-sampled by Ardour when I record.

Is it just me, or is there a completely unnecessary step in here? Is there any way to simply send the already digitized audio signal to Ardour and bypass the need to re-sample a signal that was already a sampled signal to begin with? Or is my understanding of digital synth technology completely off (if it is, please be gentle!).

_________________
Audiodef
Synthetronica
Gentoo Studio
Back to top
View user's profile Send private message Visit poster's website
Blue Hell
Site Admin


Joined: Apr 03, 2004
Posts: 20730
Location: The Netherlands, Enschede
Audio files: 158
G2 patch files: 318

PostPosted: Fri May 11, 2012 7:20 am    Post subject: Reply with quote  Mark this post and the followings unread

Sure, could do that ... for instance the capybara has digital I/O only and needs an external converter to get analog auudio from it (or it can render to a file) ... also audio interfaces tend to have digital I/O more and more ... but there would be some syncing issues for an all digital solution, like you'd probably want a central clock to sync up all devices involved (or otherwise you'd still have to resample to iron out speed differences ... also with consumer grade digital audio clock loops are quite interesting Wink ).

It's just not very practical right now I think as people tend to have loads of analog stuff.

_________________
Jan
Back to top
View user's profile Send private message Visit poster's website
Antimon



Joined: Jan 18, 2005
Posts: 3744
Location: Sweden
Audio files: 277
G2 patch files: 97

PostPosted: Fri May 11, 2012 9:52 am    Post subject: Reply with quote  Mark this post and the followings unread

Some synths and stuff have S/PDIF jacks, which are digital. As Jan says there are sync issues, and you run into them quickly.

E.g. if I want to hook up my Line6 Pod X3 to the computer using S/PDIF, I have to change the sync settings on the sound interface for my computer so that the Pod is master. Otherwise I get regular spikes in the sound as the Pod loses sync and realigns.

Then, when I turn off the Pod I have to remember to turn the sync back to using the computer as a master, or there is no sound. I spent quite some time (on several occasions) in the beginning being frustrated at my computer for being completely silent before realizing that it was slaved to S/PDIF with no master around.

Also, I've heard stories about synths (I think it was the Origin) that use some standard clock frequency on the S/PDIF (e.g. 44.1 kHz) which is lower than what is used in the D/As that are connected to the analog outputs (e.g. 96 kHz), meaning that resolution is actually lost when transferring sound digitally rather than as analog sound.

So the idea about sending sound digitally is a great one, and it's sometimes possible, but there are enough practical hurdles to make you want an analog alternative around - for now.

/Stefan

_________________
Antimon's Window
@soundcloud @Flattr home - you can't explain music
Back to top
View user's profile Send private message Visit poster's website
audiodef



Joined: Sep 05, 2011
Posts: 629
Location: Behind you
Audio files: 40

PostPosted: Thu May 24, 2012 7:01 am    Post subject: Reply with quote  Mark this post and the followings unread

What's the Pod? iPod?

Maybe this is an idea I can take with me to grad school in audio tech. Assuming I get in, of course.

_________________
Audiodef
Synthetronica
Gentoo Studio
Back to top
View user's profile Send private message Visit poster's website
Antimon



Joined: Jan 18, 2005
Posts: 3744
Location: Sweden
Audio files: 277
G2 patch files: 97

PostPosted: Thu May 24, 2012 1:02 pm    Post subject: Reply with quote  Mark this post and the followings unread

Line6 Pod - guitar amp simulator and stuff.
_________________
Antimon's Window
@soundcloud @Flattr home - you can't explain music
Back to top
View user's profile Send private message Visit poster's website
Display posts from previous:   
Post new topic   Reply to topic
Page 1 of 1 [5 Posts]
View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
 Forum index » Discussion » Schmooze
Jump to:  

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum
e-m mkii

Please support our site. If you click through and buy from
our affiliate partners, we earn a small commission.


Forum with support of Syndicator RSS
Powered by phpBB © 2001, 2005 phpBB Group
Copyright © 2003 through 2009 by electro-music.com - Conditions Of Use