[linux-dvb] How do I turn the signal/noise, siganl strength into meaningful values?

Rob rob-linuxtv at noblesque.org.uk
Mon Jun 20 23:55:52 CEST 2005


Johannes Stezenbach wrote:

>>On Monday 20 June 2005 06:13 am, Barry Scott wrote:
>>    
>>
>>>First observation is that FE_READ_SIGNAL_STRENGTH values
>>>seen to be smaller for larger signals.
>>>Second observation use that FE_READ_SNR always duplicates
>>>bits 0-7 in 8-15, why?
>>>      
>>>
>
>That's a bug in the frontend driver (which one?) then.
>Greater values mean higher signal strength. (The hardware
>usually supplied an AGC (automatic gain control) value,
>where a higher value means more gain in the input amplifier
>and thus a lower signal strength.
>  
>
Mine does that too - I've been meaning to investigate.  I have a 
Hauppauge Nova-T with the newer Conexant chipset.

-- 
Rob Noble
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