On Tue, 2009-03-24 at 18:08 -0400, Steven Toth wrote: > >> Let me ask this rhetorical question: if we did nothing more than just > >> normalize the SNR to provide a consistent value in dB, and did nothing > >> more than normalize the existing strength field to be 0-100%, leaving > >> it up to the driver author to decide the actual heuristic, what > >> percentage of user's needs would be fulfilled? > > We don't need a new API and more complexity and/or code confusion, just > standardize on the unit values for the existing APIs. > > 1) SNR in either units of db or units of .1 db (I don't care which, although I > prefer the later). Devin, ETSI TR 101 290 v1.2.1 can provide some guidance and information on conversion of measurement quantities. For example, as part of a conversion from Es/No to S/N, Annex G, G.2 and G.3 tells you the right factor to use to convert from No to N. Here's where to go to download the document: http://pda.etsi.org/pda/queryform.asp (Free registration required. Downloads of DVB docs are free.) The list of DVB standards is here: http://www.dvb.org/technology/standards/index.xml Regards, Andy > 2) Strength as a percentage. > > The approach Devin outlined above has my support. > > - Steve > -- 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
