On Sat, 24 Nov 2007, Darrell Bellerive wrote: > On Friday 23 November 2007 10:35, Bill Unruh wrote: >> On Fri, 23 Nov 2007, Gene Heskett wrote: >>>> On 2007.11.22 at 17:54:19 -0800, Darrell Bellerive wrote next: >>>>> Also while the Audiophile 24/96 does sample at 96 KHz, the audio >>>>> bandwidth of the card is limited to 22 Hz to 22 KHz +/- 0.4 dB. >> Of course there is no aliasing problem at sampling at 96K and having the >> frequency go up to 40K. There is an aliasing problem if you then >> downconvert that to 48K or 44.1K but surely the downconverter should handle >> that not the soundcard. Mind you why you want more than 22K I have no idea. >> For sound sources, that is all that you can hear. (NOt me, my ears are old >> and have trouble with 10K, but if you have little children they might >> appreciate the extra few KHz, but probably not since they already have to >> tune out that annoying 15.7KHz scream from the TV. > > I use the audio card as a spectrum analyzer for electronics work. By mixing > radio frequency (RF) signals down to audio frequencies, one can look at a > section of the RF spectrum. For some tests, the wider the bandwidth the > better. > > Baudline, a great audio analyzer application, will handle sampling rates as > high as 192 kHz. An analog channel that was flat from 0 Hz to 96 KHz would be > wonderful. Not to mention a card with a very low noise floor, excellent > dynamic range, and extremely low distortion. > > Now if only such a sound card existed . Spectrum analysers for the PC deliver far bigger bandwidths than that. Of course you probably want to go on the cheap and use a sound card, rather than buy a spectrum analyser card. Going on the cheap means you accept the limitations. For sound spectra which is what sound cards are for, a cutoff at 22KHz is very sensible, since almost all sounds are mixed down to CD quality and the aliasing distortion is attrocious if not properly taken care of. So, stop looking at sound cards. (Now of course if your interest was dolphin or whale or bat sounds, a far wider range would be nice, but consumer grade items are unlikely to cater to that audience.) ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
