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On Windows I can set the input Hz to 48000. With 41000 Hz my microphon makes annoying sounds. With 48000 Hz this is solved in Windows. So how can I set the frequency in Ubuntu globally for all application, especially Skype?

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Not an answer, but you may find some help at - because the 'frequency' you want to change is technically called sample rate. – Rafał Cieślak Apr 15 '12 at 17:52
I didn't know sample rate at the moment I wrote this post. Was forgotten ^^ thanks for the link – Michael Tanner Apr 15 '12 at 19:52
This can't help. It does not work for microphone sample rate. – Michael Tanner Apr 26 '12 at 21:53
up vote 3 down vote accepted

The default sample rate is defined in the pulseaudio daemon.conf located in /etc/pulse, or in case you need user-defined settings in ~/.pulse. Uncomment and edit the follwing line there

default-sample-rate = 48000

Changes take effect after a restart of the Pulseaudio server (issue pulseaudio -k in a terminal or log out and back in).

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