Hello List, recently I've bought this Mic. The AKG Perception 120 USB has a 24 bit A/D converter with 128x oversampling. But alsa recognizes just 16bit. When I do record "just silence" I get a white noise. In the alsamixer I set the volume of the Mic to ~43%. On the vu-meter arecord shows nothing. But Audacity shows amplitudes on the vu-meter. I was trying to force the 24bit support by unloading the usb-snd-audio module, unplugging the mic and loading the module by hand like this:
modprobe usb-snd-audio device_setup=0x09 After plugging in the mic nothing has changed. arecord --dump-hw-params -D hw:USB reports just the same sample format 16bit little endian instead of a 24bit format. Is this "just" an issue with the initalization of the microphone? Or is it not supported by the driver completely? I did test this on my PC (ARCH-Linux, AMD Opteron 1356 QuadCore, 8GB RAM, Foxcon DigitialLife Mainboard). I did the test on my WeTab (Manjaro with Netbook Optimized Kernel 3.12) also with the same result. Any suggestions how to get rid of this static white noise? thx & kind regards Sven ------------------------------------------------------------------------------ Meet PCI DSS 3.0 Compliance Requirements with EventLog Analyzer Achieve PCI DSS 3.0 Compliant Status with Out-of-the-box PCI DSS Reports Are you Audit-Ready for PCI DSS 3.0 Compliance? Download White paper Comply to PCI DSS 3.0 Requirement 10 and 11.5 with EventLog Analyzer http://pubads.g.doubleclick.net/gampad/clk?id=154622311&iu=/4140/ostg.clktrk _______________________________________________ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
