Il 22/05/2012 11:09, Antti Palosaari ha scritto: > > Basically, but not every case, there seems to be 3 different way: > 1) return raw register value without any calculation > 2) 0.1 dB > 3) scaled to 0-0xffff using some formula > > Very many drivers seems to do some dB handling even finally scaling it > to some value. > > regards > Antti Another one (from staging): as102-fe.c: Pierrick Hascoet, Devin Heitmueller linear MER I can provide a trivial patch to convert it to the more common 0.1 dB format, if you think it's useful. This note comes from the driver: /* * Note: * - in AS102 SNR=MER * - the SNR will be returned in linear terms, i.e. not in dB * - the accuracy equals ±2dB for a SNR range from 4dB to 30dB * - the accuracy is >2dB for SNR values outside this range */ Regards, Gianluca -- 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
