[hpsdr] PWR supply, also processor speed

[Bob McGwier]

Just want to make sure there is no confusion.  It is the filter length as
Lyle says but it is the length in TIME that matters.

A filter of length 4X at 192000 samples per second has the exact same
"length" as one of length X at 48000 samples per second.

All that matters with the CPU is: does it have the oomph to do the
computation and does the infrastructure around it support the data rate to
keep it busy.

Bob
N4HY


ARRL SDR Working Group Chair, AMSAT VP Engineering.
Member: ARRL, AMSAT, AMSAT-DL, TAPR, Packrats,
NJQRP, QRP ARCI, QCWA, FRC.
"Trample the slow ....  Hurdle the dead"


-----Original Message-----
From: hpsdr-bounces at lists.hpsdr.org [mailto:hpsdr-bounces at lists.hpsdr.org]
On Behalf Of Lyle Johnson
Sent: Sunday, June 29, 2008 10:12 AM
To: stoskopf at tri.net
Cc: hpsdr at lists.hpsdr.org
Subject: Re: [hpsdr] PWR supply, also processor speed

***** High Performance Software Defined Radio Discussion List *****

> Question for discussion:  I see comments on this and especially the QS1R
> board about various CPU demand in per cent utilization.  A bit of a power
> surge here took out a router, a hub, and my linux computer (I heard the
> loud snap along with the thunder from far away!) so am rebuilding.  If I
> build really fast..gamer style..I know I won't gain much and don't need
> much on CPU per cent time, but how much will that change the latency with
> larger filters?  Enough to be useful assuming the signal path is separated
> from the display?

Latency is related to filter length and sample rate, but not CPU rate. 
As long as the CPU can keep up, there should be no difference in latency.

73,

Lyle KK7P

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