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[dsp] AFSK demodulator code for ARM7TDMI?

John B. Stephensen kd6ozh at verizon.net
Sat Feb 12 01:29:34 UTC 2005

The shape of the low pass filter response is important because you want to
minimize bandwidth requirements but filtering also smears the data and
causes intersymbol interference.



----- Original Message -----
From: <scott at opentrac.org>
To: "'TAPR DSP Mailing List'" <dsp at lists.tapr.org>
Sent: Saturday, February 12, 2005 01:20 UTC
Subject: RE: [dsp] AFSK demodulator code for ARM7TDMI?

> Ahhh.. I'll take your word for it.  =]  That bit almost makes sense to
> guess it's time to pick up a basic DSP book along with the ARM manual.
> here I thought calculus was a stupid requirement for computer science...
> Scott
> N1VG
> -----Original Message-----
> From: dsp-bounces at lists.tapr.org [mailto:dsp-bounces at lists.tapr.org]On
> Behalf Of John B. Stephensen
> Sent: Friday, February 11, 2005 5:13 PM
> To: TAPR DSP Mailing List
> Subject: Re: [dsp] AFSK demodulator code for ARM7TDMI?
> Low pass filtering is required but it shoud match whatever is in the modem
> spec. Usually, the transmitter and receiver have root raised cosine
> for an overall raised cosine response, but it depends on when it was
> designed.
> 73,
> John
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