From: Georg Acher <acher@in.tum.de>
To: linux-dvb@linuxtv.org
Subject: Re: [linux-dvb] [RFC] SNR units in tuners
Date: Mon, 27 Oct 2008 15:03:48 +0100 [thread overview]
Message-ID: <20081027140348.GE9657@localhost> (raw)
In-Reply-To: <3cc3561f0810270337h4c33dd80n9b779a8dc3c8f8ce@mail.gmail.com>
On Mon, Oct 27, 2008 at 10:37:52AM +0000, Morgan Tørvolt wrote:
> As I used to work with satellite signals on an earth station, and was
> responsible for the development of measurement techniques, I thought I
> should join in here for some hopefully revelaing info.
>
> I am guessing here of course, but I believe that there is no real SNR
> measurement in any of the tuners available for computers.
My guess is that it is possible. Actually, it is quite easy for QPSK ;-) You
only need to calculate the distance of the IQ-value from the ideal symbol
center ( (sqrt(0.5),sqrt(0.5)) or whatever) after the
rotator/retiming-block.
--
Georg Acher, acher@in.tum.de
http://www.lrr.in.tum.de/~acher
"Oh no, not again !" The bowl of petunias
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next prev parent reply other threads:[~2008-10-27 13:59 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-17 18:04 [linux-dvb] [RFC] SNR units in tuners Devin Heitmueller
2008-10-17 18:13 ` Steven Toth
2008-10-17 19:55 ` Darron Broad
2008-10-17 20:06 ` Devin Heitmueller
2008-10-18 5:42 ` Darron Broad
2008-10-19 19:54 ` Georg Acher
2008-10-19 20:43 ` Darron Broad
2008-10-19 21:52 ` Georg Acher
2008-10-19 23:40 ` Darron Broad
2008-10-20 0:01 ` Darron Broad
2008-10-18 18:56 ` Richard Scobie
2008-10-17 22:01 ` Patrick Boettcher
2008-10-18 18:36 ` Trent Piepho
2008-10-18 19:38 ` Matthias Schwarzott
2008-10-19 11:46 ` Andreas Oberritter
2008-10-25 14:59 ` wk
2008-10-27 10:37 ` Morgan Tørvolt
2008-10-27 14:03 ` Georg Acher [this message]
2008-10-27 15:54 ` Andy Walls
2008-10-27 16:16 ` Morgan Tørvolt
2008-10-27 16:25 ` Georg Acher
2008-10-27 16:40 ` Manu Abraham
2009-08-07 7:04 ` VDR User
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