[linux-dvb] [Proposal] Meaningful reporting of SNR

Jeremy Nysen jnysen-linux-dvb at triaptic.com.au
Wed Apr 12 05:13:36 CEST 2006

Rusty Scott wrote:
> It seems that a good number of digital receiver chips are capable of reporting a
> meaningful SNR number, but the current drivers don't have a standard for
> providing this meaningful data.  The current concept is a bigger value is
> better than a smaller value, but the values have no meaning and can't be used
> to compare performance between cards. To this end, I think that the SNR
> reporting as it currently stands generates more confusion that it solves.  I
> would like to propose the following:
> 1)  That it be encouraged to report SNR in dB whenever possible.
> 2)  That the format of the report be an integer value representing the SNR to
> two significant digits. i.e. 32.15dB would be reported as 3215.
> 3)  For cards that don't provide signal strength directly (read from a
> register), the strength be calculated from the SNR by mapping 30dB SNR to full
> scale signal.
Coincidentally I've just been looking around the TV and DVB code and 
noticed the same thing. I agree whole heartedly that this should be 
done. It should also be done for the signal strength parameter.


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