On Mon, 29 Nov 2010, J. Pauli wrote: >> Thanks Unruh. superb explanation. Now I started to analyse things with >> specification. I shall update regarding this and share my experience. > > Hi, > > with certain restrictions it is possible to do what you are asking > because an analog soundcard is just a bunch of DACs and ADCs. Depending > on the quality of your soundcard, you can sample data with up to 96KHz > (or even 192KHz for very expensive cards). I once used a Creative Audigy Agreed, that with expensive cards you can get up to frequencies of 40 to 80KHz. They all have hard falloffs to prevent aliasing however. I do not know where they put that falloff even for the expensice cards. In may ways it is silly to put the falloff much above 20KHz since the ear ( which is what sound cards are all about) cannot hear above that. > 2 to capture data from my amplifier (keys pressed on the remote > control). The source code is still available at > http://freshmeat.net/projects/prc but it is only a quick hack and didn't > work well with other (cheaper) cards but I think this was the fault of > the processing (not the recording) part of the program. Did you use alsa or oss? I did a sound card testing routine using oss, but since he wants to use alsa I did not suggest that. Note that there a number of opensource oscilliscope programs out there which do exactly what he wants I think. He could use the info in those to figure out how to extract the signal from the sound card. > > A while back at work we even tried to interface some medical equipment > to a soundcard which worked very well but the soundcard was eventually > replaced by a custom built ADC card because the soundcard didn't had all > the functionality that we needed. The program I wrote for that purpose > was however very similar to the program above. > > Good luck, > Jan > > ------------------------------------------------------------------------------ > Increase Visibility of Your 3D Game App & Earn a Chance To Win $500! > Tap into the largest installed PC base & get more eyes on your game by > optimizing for Intel(R) Graphics Technology. Get started today with the > Intel(R) Software Partner Program. Five $500 cash prizes are up for grabs. > http://p.sf.net/sfu/intelisp-dev2dev > _______________________________________________ > Alsa-user mailing list > Alsa-user@xxxxxxxxxxxxxxxxxxxxx ------------------------------------------------------------------------------ Increase Visibility of Your 3D Game App & Earn a Chance To Win $500! Tap into the largest installed PC base & get more eyes on your game by optimizing for Intel(R) Graphics Technology. Get started today with the Intel(R) Software Partner Program. Five $500 cash prizes are up for grabs. http://p.sf.net/sfu/intelisp-dev2dev _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
