Microphone Noise Ubuntu 13.10

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http://stackoverflow.com – I had windows 8 and I was using Camtasia to record my screen and my voice via a microphone. The quality of voice was well. I just migrated to Ubuntu 13.10 and tried RecordMyScreen and Kazam to record screen. But the quality of sound is bad and has a lot of noises. How can I solve that? My laptop model is NSpiron 5010 (HowTos)