On Sun, 18 Feb 2007, gtrfree wrote: > Bill Unruh <unruh <at> physics.ubc.ca> writes: > > (snip) >>>> Does anybody on-list have a fully functioning Tascam US-428 including >>>> the use of all four inputs? > > Hi Bill. > >> As far as I can see, the tascam 418 is a usb1 device. > > Right. > >> The bandwidth is >> simply not there to use all 4 inputs. 24 bits ( usually encoded as 32 bits) >> x 2 for stereo x 4 (channels)x48000 =10Mb/s which exceeds >> the USB1 bandwidth. I have no idea what 20 bits means. The manual I saw says 24 bits. Of course many of those extra 8 bits are just noise ( no sound card has a noise floor of 140dB.) But even at 16 bits that would be 16x2x4x44100=5.6MHz. Now it may be that the system hardware combines the inputs into one 2 channel stream, in which case at 1.4Mb/s it would be just under the usb1 specs. > >> From the manual it's 16-20 bits device. > >> You need to get a usb 2 device > > Excuse me but I disagree, with Win works very good: all 4 ins with 16-20 bits. Now, are you sure that win does not do something weird, like give you 8000 rather than 44100? > BTW I've 'forced' (16 bits 44.1kHz) in arecord with -f cd and doesn't work, too > (just A/B ins). No idea what it is that you have forced. > If alsa split inputs in 2 (hw:1,0 and hw:1,1) both should work separately, not > just the first. Then there's hw:1,2 (I agree, should be a 24bits with all 4 ins > problem here) but, at least, C/D alone should work. > > Just my 2 cents. > ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
