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Windows 7: Temporal, recurring noise on microphone (maybe an unwanted boost?)


04 Nov 2011   #1

Microsoft Windows 7 Ultimate 32bit
 
 
Temporal, recurring noise on microphone (maybe an unwanted boost?)

Hello,

I have recently upgraded to Windows 7 from XP, and there is a problem with microphone input when I record. Everything seems to work correctly, but after about a minute really loud noise breaks into the recording. The noise is similar to white noise, but it's more likely caused by overamplification. I recorded a sample using mp3DirectCut, but other common sound recording applications (like Windows Sound Recorder, Audacity, Sound Forge, etc.) also record like this from microphone.

Sample here: rcnoise.mp3
From 0:00-00:21 everything is okay, you can hear me typing this post.
At 0:22 the strange noise comes in and lasts until 1:44 when everything goes back to normal. I did nothing with audio settings during making this recording. This happens even if I don't touch the keyboard or the mouse and the computer is idle recording and follows this scheme (breaks for about a minute then goes away, then repeats).

Computer specifications:
CPU: DualCore AMD Athlon 64 X2, 2500 MHz (12.5 x 200) 4800+
Audio: Realtek ALC662 @ nVIDIA nForce 6100-430 (MCP61P) - High Definition Audio Controller
Motherboard: ASRock ALiveNF6P-VSTA (2 PCI, 1 PCI-E x1, 1 PCI-E x16, 2 DDR2 DIMM, Audio, Video, LAN)

It seems there is some kind of program that adjusts the volume unintentionally and puts the input of the microphone gain (or boost) really-really high. I'm kind of new to Windows 7, I don't know if this feature is built into the operating system.

The applications usually run are below (tasklist)
Code:
========================= ======== ================ =========== ============
System Idle Process              0 Services                   0         24 K
SYSTEM                           4 Services                   0        404 K
smss.exe                       280 Services                   0        288 K
csrss.exe                      380 Services                   0      1˙524 K
wininit.exe                    428 Services                   0        868 K
csrss.exe                      436 Console                    1      5˙168 K
services.exe                   484 Services                   0      3˙984 K
lsass.exe                      504 Services                   0      3˙940 K
lsm.exe                        516 Services                   0      1˙416 K
winlogon.exe                   568 Console                    1      1˙188 K
svchost.exe                    652 Services                   0      3˙252 K
svchost.exe                    728 Services                   0      3˙336 K
svchost.exe                    816 Services                   0      8˙428 K
svchost.exe                    868 Services                   0     17˙644 K
svchost.exe                    896 Services                   0     17˙916 K
audiodg.exe                    972 Services                   0      9˙096 K
svchost.exe                   1056 Services                   0      4˙028 K
svchost.exe                   1172 Services                   0      6˙812 K
spoolsv.exe                   1324 Services                   0      3˙088 K
svchost.exe                   1352 Services                   0      6˙160 K
ekrn.exe                      1456 Services                   0     35˙472 K
taskhost.exe                  1540 Console                    1      3˙228 K
dwm.exe                       1612 Console                    1     42˙256 K
explorer.exe                  1648 Console                    1     28˙252 K
FsUsbExService.Exe            1704 Services                   0      1˙028 K
mdm.exe                       1748 Services                   0      1˙780 K
NBService.exe                 1820 Services                   0      2˙220 K
IoctlSvc.exe                  1900 Services                   0        760 K
svchost.exe                   1920 Services                   0      1˙520 K
egui.exe                      2024 Console                    1      3˙516 K
NMIndexStoreSvr.exe           1812 Console                    1      3˙712 K
msnmsgr.exe                   2120 Console                    1     27˙744 K
NPSAgent.exe                  2176 Console                    1      3˙044 K
NMIndexingService.exe         2736 Services                   0      2˙996 K
SearchIndexer.exe             2776 Services                   0      5˙240 K
svchost.exe                   2992 Services                   0      1˙920 K
svchost.exe                   3032 Services                   0      2˙084 K
wlcomm.exe                    3664 Console                    1     11˙692 K
ServiceLayer.exe              3564 Services                   0      3˙000 K
NclUSBSrv.exe                  712 Services                   0      1˙840 K
NclRSSrv.exe                  1596 Services                   0      1˙360 K
conhost.exe                   3568 Console                    1      2˙372 K
chrome.exe                    3920 Console                    1     65˙388 K
mscorsvw.exe                  2824 Services                   0      2˙572 K
chrome.exe                    2640 Console                    1     86˙440 K
svchost.exe                   1992 Services                   0      3˙348 K
rundll32.exe                  2868 Console                    1      3˙728 K
chrome.exe                    2712 Console                    1     77˙724 K
chrome.exe                    3424 Console                    1     46˙592 K
chrome.exe                    2068 Console                    1     55˙140 K
tasklist.exe                   556 Console                    1      4˙352 K
WmiPrvSE.exe                  1184 Services                   0      4˙900 K
Thank you,
hmate


My System SpecsSystem Spec
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 Temporal, recurring noise on microphone (maybe an unwanted boost?)




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