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SNR calculations (was Re: setup.exe missing from FTP site)
- From: Linda Walsh <cygwin at tlinx dot org>
- To: The Cygwin-Talk Maiming List <cygwin-talk at cygwin dot com>
- Date: Sat, 26 May 2007 14:27:02 -0700
- Subject: SNR calculations (was Re: setup.exe missing from FTP site)
- References: <1179897753.6986.80.camel@localhost> <46543145.9050009@byu.net> <009d01c79d36$ff16fd40$2e08a8c0@CAM.ARTIMI.COM>
- Reply-to: The Cygwin-Talk Maiming List <cygwin-talk at cygwin dot com>
Dave Korn wrote:
On 23 May 2007 13:19, Eric Blake wrote:
[ ... ] 8:1 ratio in bytes of fluff to content
I prefer to express that as an SNR of -18dB :-)
---
Could you please show your work!
I arrived at -9dB. Work:
For each doubling/halving of power one adjusts by ~(+/-)3dB.
(note: "3" is approximation of 10*log(2) or,
to 7 decimal places, 3.010900)
so 1 unit / 2 units of signal would be -3dB,
1 unit / 4 units: -6dB,
1 unit / 8 units: -9dB
From my limited understanding, -18dB would be a reduction of 6 factors of
2, or a 1:64 signal/noise ratio.
"Humbly" :-),
Linda Walsh