The "static" is continuous additional noise, which I would describe as a low hum with an additional bouncing crackle. But I've posted a 300 kilobyte .wav file that I recorded in a quiet room: http://www.unc.edu/~bapike/alsa/hum.wav and spectra here (using two different horizontal scales): http://www.unc.edu/~bapike/alsa/spectrum-log.png http://www.unc.edu/~bapike/alsa/spectrum-linear.png and a zoomed-in picture of the waveform in audacity: http://www.unc.edu/~bapike/alsa/waveform.png Thanks, Brian Pike On Wed, 13 Jul 2011, Bill Unruh wrote: > On Wed, 13 Jul 2011, Brian Pike wrote: > >> Hi, >> I've got a Compaq Presario 12XL505 laptop with a VT82C686 sound chip. >> Playing sound works fine. However, when I record sound using an external >> microphone, there is static recorded along with the sound. The microphone >> and microphone jack seem to be working fine, since there is no static when >> I have the microphone's input played immediately (i.e., when I change the >> Mic setting in the Playback view of alsamixer). The microphone also >> sounds fine when used on another computer. > > The immediate playback is internal to the sound chip, and has nothing to do > with what is actually sent to the computer. What kind of static? dropouts? > Additional noise? Can you look at the > recording of the static to see what it looks like? -- large noise spike? > Period of silence? discontinuity? Clipping? > >> >> I've tried recording with different settings and different programs, and I >> even compiled a newer version of alsa-driver (1.0.24) using >> alsa-compile.sh, but the problem remains. Any suggestions? >> >> By the way, the output of alsa-info.sh (when using the ALSA drivers >> included in Debian's linux-image-2.6.32-5-686 package) is available at >> http://pastebin.com/jSRzJLrW >> Please let me know if you want any other information. >> >> Thanks, >> Brian Pike >> > > ------------------------------------------------------------------------------ AppSumo Presents a FREE Video for the SourceForge Community by Eric Ries, the creator of the Lean Startup Methodology on "Lean Startup Secrets Revealed." This video shows you how to validate your ideas, optimize your ideas and identify your business strategy. http://p.sf.net/sfu/appsumosfdev2dev _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
