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On 10/29/2011 02:01 AM, James wrote:
I added a switch to femon so it displays signal and snr in dB. The cx23885 driver for my Hauppauge WinTV-HVR1250 reports signal and snr in dB. http://lockie.ca/test/femon.patch.bz2
from patch: human readable output: (signal: 0-65335, snr: 1/256 increments)\n" human readable output: (signal and snr in .1 dB increments)\n"You should take look to demod drivers and check what those are returning. I have strong feeling that most drivers returns SNR as 10xdB. And SS as 0-0xffff. I think there is good consensus of SNR unit, but for SS it is not so clear. For my drivers I have used SNR 10xdB and SS 0-0xffff. That's why, giving only those two alternatives is not suitable. Maybe it is better to set own param for SNR and SS?
Devin did some research about SNR long time back: http://www.devinheitmueller.com/snr.txt regards Antti -- http://palosaari.fi/ -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html