> From: sonicx <sonicx_@xxxxxxx> > i was wondering if it is possible,and usuable, to make precise pressure > and frequency messurements using linux. ie. to test high-end speakers.i > somehow guess so,but what do i need? can i use my > mic+soundcard+alsa+somemeasurementproggi ? This sort of measurement is as much of an art as a science; if I were you and wanted to get pretty serious about it, I'd look into measurement mics before I got too hung up on the software. Earthworks M30BX is about $900, but there are some less expensive solutions. A Shure SM-81, while not strictly a measurement mic, will work pretty well in lots of cases. I haven't seen them used for much less that $400 lately. :( You want the measurement mic to be the best thing in the chain -- a good mic on a cheap soundcard is better than a great soundcard with a poor mic. As to software, I don't know about preset solutions -- sorry. If you really want to get into it, fftw, gnuplot, and octave are all tools for rolling your own -- and it's a great way to really learn what you're doing. But be careful -- when your ears and your measurements disagree, go with your ears. Phil Mendelsohn (former mastering engineer, AES member, and audio boffin.) -- Dept. of Mathematics, 342 Machray Hall U. of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2 Office: 446 Machray Hall, 204-474-6470 http://www.rephil.org/ phil at rephil dot org
