Re: Low frequency sound from PC (Bob Masta )

Subject: Re: Low frequency sound from PC
From:    Bob Masta  <masta(at)UMICH.EDU>
Date:    Fri, 4 Oct 2002 09:05:36 -0400

Some sound cards can easily go down to 5 Hz and below. (Not usually to DC, though.) There are a lot of sound card tests and specs at <> that may help. Coincidentally, the latest Circuit Cellar magazine (#147, Oct 2002) has an article on getting response down to DC, by generating your signal as FM on some middling carrier frequency, and building an outboard demodulator to convert back to baseband. They were using it for EKG signals in the DC to low kHz range. Robert Masta tech(at) D A Q A R T A Data AcQuisition And Real-Time Analysis Shareware from Interstellar Research

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