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Re: [Discuss-gnuradio] Sample audio from my FM stereo receiver

From: Andrew Davis
Subject: Re: [Discuss-gnuradio] Sample audio from my FM stereo receiver
Date: Mon, 12 Mar 2012 22:08:57 -0400

Doesn't sound as good to me, maybe it's just a bad sample. I for some
reason ( I know the math tells me otherwise ) I find it sounds better
the faster I sample, like 500M. I feel like it has something to do
with more exact following of the FM signal curve or something.

So how exactly does the software FM Demod work ( crossing detection )?
And why can my $5 toy FM radio sound so much cleaner?

On Mon, Mar 12, 2012 at 9:09 PM, Marcus D. Leech <address@hidden> wrote:
> On 03/12/2012 09:01 PM, Marcus D. Leech wrote:
>> On 03/12/2012 09:09 AM, Rafael Diniz wrote:
>>> Marcus,
>>> Have you done any improvements to the good old RDS code in cgran?
>> Just updated the simple_fm_rcv  code to use 250e3 sample rate, since
>> that's a common rate between B100/USRP1/E1XX and N2XX family, and
>>  all the math "works out".  That will more lightly load the cpu as well,
>> compared to 320e3.
> And here's an audio sample using the new "common" sample rate:
> http://www.sbrac.org/files/fm_stereo_test2.ogg
> --
> Marcus Leech
> Principal Investigator
> Shirleys Bay Radio Astronomy Consortium
> http://www.sbrac.org
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> Discuss-gnuradio mailing list
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