Digital Static Noise on Recording - Core Audio Bug?

I'm using a G5 DP 2.3, and when recording from the USB Audio Codec*, digital noise/static kicks in after a seemingly random period of time, anything from 3 mins to 15 mins. This occurs with any audio application.
The 'workaround' is to go into Audio MIDI Setup, and change the sample rate for USB Audio Codec to 48 KHz (rather than the standard 44.1 KHz). That seems to stop it in any application, except GarageBand, which changes the sample rate back to 44.1 KHz when it opens.
Anyone have any further news on this??
*should clarify - USB Audio Codec is what's used for USB audio input devices, e.g. USB turntable (Pro-Ject III USB in my case) and some USB mics. The issue doesn't occur when recording from the computers own (non-USB) audio input, or from a (FireWire) audio interface.
Message was edited by: Greg Cheasman

I think i posted this somewhere on here before, but this option has worked for me...and in garageband--at least for now. I have a "tube MP" usb device that i got and i was having this static problem. For some reason, which i do not understand, i've not had the issue lately by going in and changing to the 48KHz setting. Maybe i'm opening garageband first, then changing the setting? I don't know, but i do know i have to change the setting ever time i use it and i've got now static now for some time.
There is no doubt that something is wrong on Apple's end. It's been extremely disapointing for me to find that after switching to Mac because of the "user friendly" aspect that i've actually had more problems recording audio via usb with my mac than i ever thought about having with my PC.
What's even more unbelievable to me is that such an obvious problem would be ignored by Apple. Makes me kind of want to call up some PC companies and give them a suggestion for a real funny comercial for their PC: Have some guy speaking into a mic about how awesome apple is and about half-way through the commercial this horrible static sound just starts pumping over his voice... you get the picture.

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I think i posted this somewhere on here before, but this option has worked for me...and in garageband--at least for now. I have a "tube MP" usb device that i got and i was having this static problem. For some reason, which i do not understand, i've not had the issue lately by going in and changing to the 48KHz setting. Maybe i'm opening garageband first, then changing the setting? I don't know, but i do know i have to change the setting ever time i use it and i've got now static now for some time.
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Last edited by fast_rizwaan (2011-09-08 00:29:10)

hi archers,
I went to the computre hardware market today to buy 'Creative Sound Blaster Live 5.1 with emu10k1 chipset'.
I thought that having hardware mixing (HWMIX) will fix noise, as the sound card is shielded from interference.
But, unfortunately or fortunately, the SBS 5.1 is not available in the market. only SBS 5.1VX model which has a different chipset is available.
So, I retured a bit disappointed thinking that the evil microsoft has caused the soundcard manufactureres to stop support to non MS OS, oh my poor linux hardware!
Based on the following, http://www.voxforge.org/home/docs/faq/f … pling-rate
I tried fiddling with sample rate, and you know what, the whirring noise is gone. It's like Windows (without fan noise suppression and echo cancellation but no static noise)
HURRAY I FOUND THE SOLUTION: setting the sound-card sampling-rate to 96000 (for my intel sound card) fixes the noise!
Here's HOWTO fix microphone noise problem in linux which was bugging me for many years!
1. Determine soundcards in the system
$ arecord --list-devices
output wrote:**** List of CAPTURE Hardware Devices ****
card 0: Intel [HDA Intel], device 0: ALC888 Analog [ALC888 Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: Intel [HDA Intel], device 2: ALC888 Analog [ALC888 Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
soudcar is hw:0,0
2. Determine Sound card's sampling-rate of the sound card
arecord -f dat -r 60000 -D hw:0,0 -d 5 test.wav
output wrote:"Recording WAVE 'test.wav' : Signed 16 bit Little Endian, Rate 60000 Hz, Stereo
Warning: rate is not accurate (requested = 60000Hz, got = 96000Hz)
please, try the plug plugin
Now that we got the max-sampling-rate to 96000, we should set this in pulseaudio's configuration file /etc/pulse/daemon.conf. So first test it:
Just a quick test
arecord -f dat -r 96000 -D hw:0,0 -d 5 test.wav
And surprise, surprise, no whirring static noise in the mic recording in linux. Hurray again!
3. Setting the soundcard's sampling rate into pulse audio configuration
the default sample-rate in pulseaudio is
cat /etc/pulse/daemon.conf|grep sample-rate
output wrote:; default-sample-rate = 44100
we got 44100 and which is disabled
Let's set that to our hardware specific settings:
su -c "sed 's/; default-sample-rate = 44100/default-sample-rate = 96000/g' -i /etc/pulse/daemon.conf"
let's verify the changes to deamon.conf
cat /etc/pulse/daemon.conf|grep sample-rate
output wrote:default-sample-rate = 96000
It's done
4. Restart pulseaudio to apply the new settings
pulseaudio --kill
pulseaudio --start
That's it, now Skype, and all microphone related application will have neat audio! Thanks Archers. hope it helps.
Is there a way to suppress fan noise in pulseaudio, cause the fan noise is bothering me now at forvo.com
I also updated the pulseaudio wiki https://wiki.archlinux.org/index.php/Pu … _Recording
Last edited by fast_rizwaan (2011-09-08 00:27:53)

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Digital Static Noise on Recording - Core Audio Bug?

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