[mythtv-users] SNR reported by kernel dvb for HD-5500 card

[Tom Dexter]

On Fri, Apr 4, 2008 at 5:18 PM, Johan <johan.vanderkolk at dommel.be> wrote:
>
>  It's all down to how the registers of the receiverchips are read and
>  interpreted. Maybe this link can help you:
>  http://www.mail-archive.com/linux-dvb@linuxtv.org/msg20376.html
>
>  Actually, it's old enough to be implemented by now. Femon's method
>  reporting a percentage might not be correct. A SNR of 100% would mean
>  that Signal and Noise are equal, but in fact you have to interpret this
>  for femon as perfect.
>  Is femon really using the driver (which reports in dB) or is it just
>  reading raw registervalues and making its own calculations...
>
>  If 8-13% works fine than that is your reference for a good reception.
>
>  Johan
>

Part of the reason I was interested in knowing the true s/n was
because I get a lot of mpeg2video errors on the backend from
commflagging.  Sometimes I get a ton of them and even on recordings
that play flawlessly.  Just doesn't make sense to me.  Those sorts of
decoding errors are usually attributed to a recording from a noisy
source.

Tom