Sigmund Augdal Helberg wrote: >>> On Fri, 2006-01-13 at 10:44 +0100, Romain DEGEZ wrote: >>> >>>I'll try differents things (our 3 methods, cable plugged or not and maybe a longer cable to >>>obtain a small decrease in the signal strength). >>>Moreover maybe the register (3A) that set the value we should obtain by reading the 3B register >>>is not set correctly but by reading the specs, everythings seems OK to me (but i'm very far to >>>be an expert in DVB internals...) >>> >>>I'll try this right now and keep you posted. >> >>plugged = 12% = 0x21 = 0010 0001 >>unplugged = 43% = 0x6f = 0110 1111 >> >>value + 0x80: >>plugged = 62% = 0xa1 = 1010 0001 >>unplugged = 93% = 0xef = 1110 1110 >> >>~(value - 1): >>plugged = 87% = 0xdf = 1101 1111 >>unplugged = 56% = 0x91 = 1001 0001 >> >>interessant things: >>43 - 12 = 31 >>93 - 62 = 31 >>87 - 56 = 31 >> >>mhhh ok, what to do with that ? >>mhh 31 = 2^5-1 -> nice but so what ? ;-) >> >>Note that with the old card, signal strength is exactly OxO when unplugging the cable. > > We're really out of my leage now. I think the interresting finding here > is that with your change, the signedness of the reported signal is > correct. That is, at better signal gives higher values. I peeked at > other tuners drivers and it seems they often do stuff like adding > offsets and multiplying with some factor, I guess this will have to be > done for this card as well. > > Sigmund Hello, Thanks for your answer :-) I was having such a feeling too (about the offset and multplying things) but wanted another point of view as I found this a little crude :-) I'll try to find a way to slowly decrease the signal of my reference card in order to guess a linear factor. Maybe Steve can help us here as he may have a look at the Windows drivers ? -- Romain DEGEZ, System and Network Administrator SMARTJOG S.A. 16 Place de la R?publique, 75010 Paris, FRANCE http://www.smartjog.com Phone : +33.1.49.96.63.19 Fax : +33.1.49.96.64.05 Mobile : +33.6.84.24.65.21 romain.degez@xxxxxxxxxxxx -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 189 bytes Desc: OpenPGP digital signature Url : http://www.linuxtv.org/pipermail/linux-dvb/attachments/20060113/8b7478a7/signature.pgp
