USB CM119 Capture Noise

[fernando.afonso]

Hi,

I have tried to capture audio with some quality, but whatever you do I can not get the static noise.

https://dl.dropbox.com/u/297322/music.wav

Is not power issue, I have tried a powered 2.5W usb hub, different usb cables, bypass both usb fuses, and also connet the Raspberry PI to a PC power supply on TP1 and TP2 directly.

I have also tried different usb audio devices and nothing change.

arecord -f S16_LE -r 44100 -d 60 -D hw:1,0 music.wav

pi@raspberrypi ~ $ uname -a
Linux raspberrypi 3.2.27+ #174 PREEMPT Wed Sep 26 14:09:47 BST 2012 armv6l GNU/Linux

pi@raspberrypi ~ $ top
2038 pi 20 0 4884 1328 1132 S 0.3 0.6 0:00.23 arecord

Can anyone help me please?

[pluggy]

The USB implementation on the Pi drops packets which is the likely cause of the problem. If the audio device and everything else plugged into the USB will stand USB 1.1 speeds (so called full speed vs high speed) you could add

Code: Select all

dwc_otg.speed=1

to the /boot/cmdline.txt file and rebooting the Pi.

It may improve things.

[fernando.afonso]

The USB implementation on the Pi drops packets which is the likely cause of the problem. If the audio device and everything else plugged into the USB will stand USB 1.1 speeds (so called full speed vs high speed) you could add

Code: Select all

dwc_otg.speed=1

to the /boot/cmdline.txt file and rebooting the Pi.

It may improve things.

FIXED!

https://dl.dropbox.com/u/297322/music_fixed.wav

Many thanks.

[pluggy]

Just don't try and use a modern webcam at the same time

[fernando.afonso]

Just don't try and use a modern webcam at the same time

With my 800W PSU connection I can use my raspberry as a RAID 5 NAS!

[pluggy]

A seriously slow RAID5 NAS perhaps..........