At Fri, 20 Jul 2007 12:49:05 +0800, Saurav SAHU wrote:
We have encountered some audio recording quality issues on the recent ALSA-USB drivers. These problems are faced on C-Media chipset based external USB audio devices. The recorded audio with 'arecord' is quite noisy, unclear and jerky. The version of ALSA I encountered are 1.0.12 and beyond. It seemed to work well previously on ALSA version 1.0.8. If I record with a Philips webcam mic (Philips chipset), the audio recording is very clear on across all ALSA versions.
In case you have observed similar issues with C-Media drivers and aware of them, please let me know.
To make it clear whether it's a driver problem of an alsa-lib problem, try to record with -Dhw at first. If you still have noises, try 44.1kHz (-r44100) with -Dhw.
Takashi