[linux-dvb] A/V sync issues with DVB-S

Steven Toth stoth at linuxtv.org
Wed Aug 20 16:07:35 CEST 2008


Antti Palosaari wrote:
> Thomas Börkel wrote:
>> hermann pitton wrote:
>> Measuring the strength and SNR is not so easy now. My SAT receiver
>> always says strength 70% and SNR 80%. My new Nova S Plus cards always
>> report strength 97% and SNR 99%. Only my TT 1500s reported reasonable
>> numbers like strength 63-80% and SNR 75-90%.
> 
> What is the recommended way to report signal strength or SNR by the 
> driver? Both of those are 16bit unsigned value. Is it better to scale 
> 0-0xffff or return as decibels? If SNR is reported as decibels it will 
> look like very small value...
> 
> Antti

May of the drivers I've added recently report their values in db, but I 
typically also have one precision point. So I report 20.4 as 204 decimal.

- Steve




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