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Old 05-11-2008, 12:13 PM   #1
chadwick
Member
 
Registered: Apr 2005
Location: At the 100th Meridian where the great plains begin
Distribution: Debian Testing on T60 laptop
Posts: 105

Rep: Reputation: 17
alsa settings for buzzy microphone


I'm trying to use Skype but it seems that my microphone is not working properly. I'm testing it by calling my regular phone and listening to myself talk. At the speaker of the regular phone, my voice is reproduced at a normal volume, but it comes out being distorted, sounding slightly metallic but mostly it picks up a kind of buzzing. I've been playing around a lot with alsamixer and haven't been able to fix it, although bringing down the <Digital> volume bar did diminish it a bit. I'm now a bit stuck since blindly fiddling with alsamixer is about the extent of my audio troubleshooting skills. In the hope that someone could see something obvious, or inform me of something that I haven't checked, here is what my alsamixer is set as:

Code:
 ------------------------------------------------------------[AlsaMixer v1.0.16 (Press Escape to quit)]------------------------------------------------------------
| Card: HDA Intel                                                                                                                                                  |
| Chip: Analog Devices AD1981                                                                                                                                      |
| View:  Playback  Capture [All]                                                                                                                                   |
| Item: Master [dB gain=-10.50, -10.50]                                                                                                                            |
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|          ----           ----           ----           L----R                         ----                          L    R                                        |
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|         86<>86         7 <>77        100<>100        100<>100         0<>0                                         33<>33                        27<>27          |
|       < Master >        PCM             CD             Mic          Mic Boos        IEC958        IEC958 P        Capture          Mix          Digital          |
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 ------------------------------------------------------------------------------------------------------------------------------------------------------------------
 
Old 05-11-2008, 01:57 PM   #2
Beads
Member
 
Registered: Nov 2004
Location: Washington
Distribution: Mint
Posts: 104

Rep: Reputation: 17
Your audio input is "clipping". Clipping is the distortion you are hearing. First, lower your microphone input to the mixer by going to the input section of the mixer. Find the microphone slide bar, and begin reducing it while listening to the audio.

If this doesn't reduce the distortion, the problem is physical. Either your mic capsule is damaged; or your cord/plug arrangement is damaged.

Try lowering the input first.
 
Old 05-11-2008, 07:09 PM   #3
chadwick
Member
 
Registered: Apr 2005
Location: At the 100th Meridian where the great plains begin
Distribution: Debian Testing on T60 laptop
Posts: 105

Original Poster
Rep: Reputation: 17
Thanks for your reply. I tried as you suggested and lowered the microphone slide bar. The distortion's still there. I installed audacity in order to play around a bit and investigate. When recording and playing back using the audacity gui with the same microphone, the playback sounds normal. I also can't see any clipping of the waveform. Perhaps audacity is smarter than skype somehow?
 
  


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