[hpsdr] Perseus is a reality

[John Miles]

That does make sense; I hadn't really thought about the fact that it's
down_sampling_ as well as downconverting.  The gain is more like 4-5 bits in
that example (10*log(downsampling factor) dB, rather than 20), but still
very much worthwhile.  It doesn't sound like USB-side throughput is the
bottleneck, at any rate, so sending 16-bit samples to the host wouldn't
help.

Also: thanks for the clarifications, Nico!  I now understand a little more
about what you're faced with.  That's a great-looking rig.

-- john, KE5FX

> -----Original Message-----
> From: hpsdr-bounces at lists.hpsdr.org
> [mailto:hpsdr-bounces at lists.hpsdr.org]On Behalf Of Alberto I2PHD
> Sent: Wednesday, October 10, 2007 8:01 AM
> To: hpsdr at lists.hpsdr.org
> Subject: Re: [hpsdr] Perseus is a reality
>
>
> ***** High Performance Software Defined Radio Discussion List *****
>
> John Miles wrote:
> >
> > (I'm not sure what 24-bit resolution buys you with 16-bit ADCs.)
> >
> Don't forget that when you downsample you receive a processing
> gain proportional to the decimation factor, so when you
> go from 80 Ms/sec to 125 ks/sec you gain about 9 bits of resolution.
>
> 73  Alberto  I2PHD
>


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