I notice that you used arecord to record those audio samples. Arecord is part of ALSA. Do you get the same result if you use the parecord command to record via Pulseaudio?
PulseAudio does use ALSA, but by using arecord, you are effectively going to ALSA, and then to Pulse, and then back to ALSA, introducing extra bits in the chain, which could be the problem. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to pulseaudio in Ubuntu. https://bugs.launchpad.net/bugs/1100232 Title: [SBC-FITPC2, Realtek ALC662 rev1, Blue Line In, Rear] Recording has crackeling noise Status in “pulseaudio” package in Ubuntu: New Bug description: Please have a look at these two audio recordings: https://dl.dropbox.com/u/6520164/test.wav https://dl.dropbox.com/u/6520164/test1.wav These were recorded via $ arecord > test.wav $ arecord -r 48000 -f FLOAT_LE > test1.wav The signal should be a 50 Hz Sine wave, however specially in the second recording you will oberserve this: In regular intervalls the signum of the signal is flipped. This leads to a crackling noisy recording. ProblemType: Bug DistroRelease: Ubuntu 12.10 Package: pulseaudio 1:2.1-0ubuntu4 ProcVersionSignature: Ubuntu 3.5.0-21.32-generic 3.5.7.1 Uname: Linux 3.5.0-21-generic i686 ApportVersion: 2.6.1-0ubuntu9 Architecture: i386 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: sb 3534 F.... pulseaudio Date: Wed Jan 16 11:47:51 2013 InstallationDate: Installed on 2013-01-15 (0 days ago) InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release i386 (20120817.3) MarkForUpload: True SourcePackage: pulseaudio Symptom: audio Symptom_Card: HDA-Intel - HDA Intel MID Symptom_Jack: Blue Line In, Rear Title: [SBC-FITPC2, Realtek ALC662 rev1, Blue Line In, Rear] Pulseaudio fails to detect card UpgradeStatus: Upgraded to quantal on 2013-01-16 (0 days ago) dmi.bios.date: 12/24/2009 dmi.bios.vendor: Phoenix Technologies LTD dmi.bios.version: NAPA0001.86C.0000.D.0912241315 dmi.board.name: SBC-FITPC2 dmi.board.vendor: Intel Corporation dmi.board.version: 1.x dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 1 dmi.chassis.vendor: OEM dmi.chassis.version: N/A dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvrNAPA0001.86C.0000.D.0912241315:bd12/24/2009:svnCompuLab:pnSBC-FITPC2:pvrNotApplicable:rvnIntelCorporation:rnSBC-FITPC2:rvr1.x:cvnOEM:ct1:cvrN/A: dmi.product.name: SBC-FITPC2 dmi.product.version: Not Applicable dmi.sys.vendor: CompuLab To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1100232/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
