PSN-L Email List Message

Subject: RE: Stability of sound cards
From: "Jack Ivey" ivey@..........
Date: Tue, 11 Jul 2006 17:48:18 -0400

>Isn't +/-100ppm +/-0.01Hz at 1000Hz?

100 ppm is 0.0001.  0.0001*1000 Hz =3D 0.1 Hz

The other issue with some sound cards has to do with the sample rate
not being uniform due to hardware limitations (poor design).  That=20
would show up as noise on the output in this case.  There are DSP-type=20
radio receivers out there that use sound cards for digitization, but=20
they choose their sound cards carefully.

Despite all that, I'll bet you can demodulate something that looks
very like a seismic signal with any old sound card and some=20
effort. =20



Public Seismic Network Mailing List (PSN-L)

[ Top ] [ Back ] [ Home Page ]