Share your knowledge at the LQ Wiki.
Go Back > Forums > Linux Forums > Linux - Hardware
User Name
Linux - Hardware This forum is for Hardware issues.
Having trouble installing a piece of hardware? Want to know if that peripheral is compatible with Linux?


  Search this Thread
Old 07-16-2004, 04:50 PM   #1
Registered: Apr 2004
Distribution: Fedora Core 3
Posts: 73

Rep: Reputation: 15
Audio: Full duplex (playback/record)

I'm trying to do full duplex audio recording using Audacity. This involves listening to a previously recorded audio track while recording a new one. The program is configured to use /dev/dsp for both record and playback but I've gotten the impression from googleing that I need to use /dev/dsp for recording and /dev/dsp1 for playback. (Seems to make sense...)

When I try to do this in Audacity using the stock setup, it does indeed record a new track but the new audio track is very distorted (garbled) sounding.

I see both dsp and dsp1 device files in /dev but Audacity only lists /dev/dsp in it's dropdown menu of which device to use.

My sound hardware is built-in: Intel 82801DB-ICH4 which I'm pretty sure is capable of full duplex operation. Does anyone know if this is true and, if so, then what is missing on the software/os side?

How do I make use of both dsp and dsp1 devices?

BTW, I'm using the ALSA drivers, etc from "Planet CCRMA".

Thanks in advance,
Old 07-17-2004, 01:33 AM   #2
Senior Member
Registered: Nov 2002
Location: pikes peak
Distribution: Slackware, LFS
Posts: 2,577

Rep: Reputation: 48
LOL, you've been here long enough to know NOT
to double post............
Old 07-17-2004, 11:29 AM   #3
Registered: Apr 2004
Distribution: Fedora Core 3
Posts: 73

Original Poster
Rep: Reputation: 15
Oops. I didn't realize this was a no-no. And since my first post died of old age without any replies I figured it was placed in the wrong context. Sorry. It won't happen again.

Now, where was I?

Don't most /dev files "relate" to an actual peice of hardware? I'm trying to understand the theory behind device files and any enlightenment would really be appreciated. In this case, what hardware is /dev/dsp driving? My sound card?

It's critical to what I mainly want to use my linux box for to get this audio functionality working.

Thanks in advance for any help on this.



Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
full duplex chazzwozzer Linux - Networking 1 02-07-2005 02:11 PM
Audio: Full Duplex Playback/Record Utah Linux - General 0 07-16-2004 04:53 PM
Audio: Using two dsp devices for full duplex? Utah Linux - Software 0 07-14-2004 02:22 PM
Full duplex sound InSane103 Linux - Hardware 15 05-12-2004 11:58 PM
Audigy2 and Full Duplex ViN86 Linux - Hardware 0 04-19-2004 06:21 PM > Forums > Linux Forums > Linux - Hardware

All times are GMT -5. The time now is 02:28 PM.

Main Menu
Write for LQ is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
Open Source Consulting | Domain Registration