From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mta5.srv.hcvlny.cv.net ([167.206.4.200]:35256 "EHLO mta5.srv.hcvlny.cv.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751994AbZCXWIP (ORCPT ); Tue, 24 Mar 2009 18:08:15 -0400 Received: from steven-toths-macbook-pro.local (ool-45721e5a.dyn.optonline.net [69.114.30.90]) by mta5.srv.hcvlny.cv.net (Sun Java System Messaging Server 6.2-8.04 (built Feb 28 2007)) with ESMTP id <0KH100BI06TFKIM0@mta5.srv.hcvlny.cv.net> for linux-media@vger.kernel.org; Tue, 24 Mar 2009 18:08:12 -0400 (EDT) Date: Tue, 24 Mar 2009 18:08:03 -0400 From: Steven Toth Subject: Re: The right way to interpret the content of SNR, signal strength and BER from HVR 4000 Lite In-reply-to: <412bdbff0903241439u472be49mbc2588abfc1d675d@mail.gmail.com> To: Devin Heitmueller Cc: Andy Walls , linux-media@vger.kernel.org, Trent Piepho , Mauro Carvalho Chehab , Ang Way Chuang , VDR User , Manu Abraham Message-id: <49C959C3.3060402@linuxtv.org> MIME-version: 1.0 Content-type: text/plain; charset=ISO-8859-1; format=flowed Content-transfer-encoding: 7BIT References: <49B9BC93.8060906@nav6.org> <20090319101601.2eba0397@pedra.chehab.org> <412bdbff0903191536n525a2facp5bc9637ebea88ff4@mail.gmail.com> <49C2D4DB.6060509@gmail.com> <49C33DE7.1050906@gmail.com> <1237689919.3298.179.camel@palomino.walls.org> <412bdbff0903221800j2f9e1137u7776191e2e75d9d2@mail.gmail.com> <412bdbff0903241439u472be49mbc2588abfc1d675d@mail.gmail.com> Sender: linux-media-owner@vger.kernel.org List-ID: >> 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). 2) Strength as a percentage. The approach Devin outlined above has my support. - Steve