Sven Moeller wrote: > Am Samstag, 27. September 2014, 12:19:17 schrieb Clemens Ladisch: >> Sven Moeller wrote: >>> recently I've bought this Mic. The AKG Perception 120 USB has a 24 bit A/D >>> converter with 128x oversampling. >> >> This is an interesting choice of words. I notice the absence of statements >> like "uses" or "actually supports". > > The product description says "USB microphone with an integrated analog-to- > digital converter with 24-bit and 128x oversampling": > http://www.akg.com/P120+USB-1039.html?pid=1030 > > lsusb -v -d 074d:3556 > > idVendor 0x074d Micronas GmbH > idProduct 0x3556 Composite USB-Device This chip is a Micronas UAC 3556B. The datasheet says: | - supports 8/16-bit mono/stereo recording and up to | 24-bit playback It would be possible to connect an external A/D chip (and according to AKG's ads, they did), but this is what the descriptors say: (playback:) > bNrChannels 1 > bBitResolution 16 > bNrChannels 2 > bBitResolution 16 (capture:) > bNrChannels 1 > bBitResolution 8 > bNrChannels 1 > bBitResolution 16 > bNrChannels 2 > bBitResolution 16 Well, lookee here: <http://www.akg.com/Counterfeit+Warning-1053.html>. You could try asking them if this device was designed so that 8 bits of the digitized samples are thrown away before transferring them to the PC, or if it actually supports 24-bit recording and you happened to get a counterfeit device instead. Regards, Clemens ------------------------------------------------------------------------------ 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@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
