Page 2 of 5
Re: Records at high speed
Posted: Mon May 19, 2014 1:12 am
by steve
Ken Coburn wrote:None of the default input devices give any indication on the input level meter.
OK, but does Audacity play correctly when the defaults are selected? Try importing an audio file or generate a click track.
Re: Records at high speed
Posted: Tue May 20, 2014 6:56 pm
by Ken Coburn
The only working input is: SB Live! 5.1 (SB0060) Multichannel Capture/PT Playback (hw:0.2) Line:0
Re: Records at high speed
Posted: Tue May 20, 2014 7:41 pm
by steve
If you do not already have it installed, install "pavucontrol" (PulseAudio Volume Control).
Ensure that no other audio programs are running - particularly ensure that you have no web pages open that contain sound.
Open Audacity and set both the recording and playback devices to "Pulse".
Import a long audio file and start playing.
If sound is not heard, open pavucontrol while Audacity is playing and look in the "Playback" tab. Audacity should be listed and there should be an option to select which output to use and playback level.
Re: Records at high speed
Posted: Tue May 20, 2014 9:24 pm
by Ken Coburn
pavucontrol installed and recording and playback devices set to Pulse. No input. Screenshot attached.
/home/kenneth/Desktop/Screenshot-1.png
Re: Records at high speed
Posted: Tue May 20, 2014 10:07 pm
by steve
Ken Coburn wrote:/home/kenneth/Desktop/Screenshot-1.png
Use the "upload attachment" option below the message composing box.
Re: Records at high speed
Posted: Tue May 20, 2014 10:34 pm
by Ken Coburn
- Screenshot-1.png (47.76 KiB) Viewed 2131 times
Sorry about that.
However, I think we're on the wrong tack here. The problem seems to be time compression. A recording with a real time length of 3:35 is displayed as 1:36 as indicated by the time shown above the waveforms. The waveforms show very visible time compression. When played back, it does not appear that the pitch has changed. The sound is what you would hear if the phono stylus rapidly skipped grooves during playback. Since I monitor the music while recording, I know that is not the case.
Re: Records at high speed
Posted: Wed May 21, 2014 12:14 am
by steve
Ken Coburn wrote:A 100 second recording plays back in 43.5 seconds. In addition to the pitch being far too high, the recording appears to be full of holes or dropouts.
Ken Coburn wrote:When played back, it does not appear that the pitch has changed.
So which is it? The pitch is too high on playback or not too high?
Re: Records at high speed
Posted: Wed May 21, 2014 12:30 am
by Ken Coburn
I believe the pitch is correct. The playback skips so badly that I at first thought the pitch was higher. My apologies for the confusion.
Re: Records at high speed
Posted: Wed May 21, 2014 11:31 am
by steve
OK, so if you generate a 30 second 440 Hz tone, does it play back smoothly as a constant tone for 30 seconds?
While it is playing, what shows on the "Playback" tab in pavucontrol?
Re: Records at high speed
Posted: Wed May 21, 2014 3:29 pm
by Ken Coburn
- Screenshot-Volume Control.png (42.27 KiB) Viewed 2073 times
Yes, it plays back smoothly at a constant tone.