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[hfsig] Performance of 24/192 soundcards? USB Soundcards

Robert McGwier rwmcgwier at comcast.net
Wed Sep 22 01:44:13 UTC 2004


You analysis is correct.  This is a self synchronizing descrambler.
It is essentially the anhilating polynomial for the scrambling polynomial.
As such,  since it is a polynomial division, it is an "infinite impulse
response" type of configuration.  This means that there is error
propagation.  The SYSTEM BER does indeed degrade with a hole at zero.

I delivered James paper at the TAPR/ARRL  DCC where the work was introduced
(Columbia, Md. a million years ago).  He has indeed done a careful analysis
and I believe the orignal paper is still available on his web site as
well as other analysis.

Bob
N4HY


-----Original Message-----
From: hfsig-bounces at lists.tapr.org
[mailto:hfsig-bounces at lists.tapr.org]On Behalf Of
Anthony.N.Martin at marconiselenia.com
Sent: Wednesday, September 22, 2004 12:11 AM
To: TAPR HF Modes SIG Mailing List
Subject: RE: [hfsig] Performance of 24/192 soundcards? USB Soundcards

MUCH DELETED

> There is a 17-stage scrambler that could give you a run of
> 16 or 17 bits without transitions.  Now we're down to 50 Hz or so.


Ant M1FDE

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