View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0003515 | ardour | bugs | public | 2010-10-31 19:17 | 2020-04-19 20:14 |
| Reporter | deva | Assigned To | paul | ||
| Priority | normal | Severity | major | Reproducibility | always |
| Status | closed | Resolution | no change required | ||
| Target Version | 3.0-beta1 | ||||
| Summary | 0003515: "Auto Input" builds up noise signal. | ||||
| Description | In projects with many (I have tested it with 16) channels, enabling "Auto Input" will make the master channel play a white-noise-like signal louder and louder. It appears to be some kind of loop, since it can be stopped by turning the level down on the master bus. Disabling the "Auto Input" button makes it stop immediately. Creating a project with only a few (I have tried it with 1) tracks does not make the noise. It can be reproduced by simply creating a new project with 16 channels and enabling "Auto Input". after creation (if it is not on by default) | ||||
| Tags | No tags attached. | ||||
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Well, I would say that was a normal and expected thing to happen. I would guess that each of your channels is connected to your soundcard's inputs. These will generate noise (all electronics does). The more inputs you have the more the noise adds up. Then I would guess that your master output is connected to your soundcard's output, then one of its settings is probably set to feed the output back to the inputs for monitoring, hence the gradual increase in the noise level; feedback. I don't believe this to be a bug. |
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No. It is not static from the soundcard. I don't even have 16 channels on my soundcard. Like I wrote it builds up and increases to infinity. |
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I didn't say it was static, I said it was noise, Johnson noise. ie the self noise generated by the inputs. You don't need 16 channels, Ardour automatically routes however many inputs you have until they are exhausted then starts again. So if you have 2 inputs you will see ch1=in1, ch2=in2, ch3=in1, ch4=in2 and so on. What is you're setup ? What soundcard etc |
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I have an M-Audio Audiophile 192, with 2 channels in and 2 channels out. The chip shows up in ALSA with many more channels, I never really understood why. It appears that the noise buildup starts when I create the 11th track with "Auto Input" enabled. I can stop the noise by either disconnecting the input to the newly created channel, disabling "Auto Input" or by disconnecting the master output channel from the physical outputs on the sound card. NOTE: I do not have anything connected with the input channels on the soundcard. The loop happens in software. Futhermore, I noticed that channel 1 and 2 on the soundcard (which are the only physical inputs) are not connected until track 11 and 12 are created. Should the input channel assignment not use these two ports fro track 1 and 2? (Currently they start with sound card channel number 3 and 4 for track 1 and 2). I am not really sure what or where the issue is here. It might even be in jack or ALSA. I'll be happy to look more into it if somebody will tell me where to look... |
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You will need to use other forums/mailing lists to get help with your Audiophile. You probably have the internal hardware mixer set up to create a feedback loop, but without access to one of these cards, its impossible to know what settings to play with. This is definitely NOT a bug in JACK or Ardour and does not happen to other users with the same h/w or other users with different h/w. |
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I can confirm that changing the parameters of the hardware monitoring inside the Audiophile did indeed change the behavior of the feedback I have been experiencing. I therefore conclude that the problem somehow lies in ALSA or the control surfaces built on top of that. |
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Issue has been closed automatically, by Trigger Close Plugin. Feel free to re-open with additional information if you think the issue is not resolved. |
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2010-10-31 19:17 | deva | New Issue | |
| 2010-10-31 19:48 | oofus | Note Added: 0009330 | |
| 2010-10-31 21:18 | deva | Note Added: 0009331 | |
| 2010-10-31 21:25 | oofus | Note Added: 0009332 | |
| 2010-11-01 09:18 | cth103 | cost | => 0.00 |
| 2010-11-01 09:18 | cth103 | Target Version | => 3.0-beta1 |
| 2010-11-01 10:38 | oofus | Note Edited: 0009330 | |
| 2010-11-03 11:00 | deva | Note Added: 0009336 | |
| 2010-11-04 18:03 | paul | Note Added: 0009345 | |
| 2010-11-04 18:03 | paul | Status | new => resolved |
| 2010-11-04 18:03 | paul | Resolution | open => no change required |
| 2010-11-04 18:03 | paul | Assigned To | => paul |
| 2010-11-04 20:38 | deva | Note Added: 0009352 | |
| 2020-04-19 20:14 | system | Note Added: 0022256 | |
| 2020-04-19 20:14 | system | Status | resolved => closed |
