From owner-freebsd-multimedia@FreeBSD.ORG Sun Feb 24 23:57:11 2008 Return-Path: Delivered-To: freebsd-multimedia@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 8B80A16A403 for ; Sun, 24 Feb 2008 23:57:11 +0000 (UTC) (envelope-from danny@ricin.com) Received: from smtpq1.tilbu1.nb.home.nl (smtpq1.tilbu1.nb.home.nl [213.51.146.200]) by mx1.freebsd.org (Postfix) with ESMTP id 25D5D13C459 for ; Sun, 24 Feb 2008 23:57:11 +0000 (UTC) (envelope-from danny@ricin.com) Received: from [213.51.146.188] (port=50211 helo=smtp3.tilbu1.nb.home.nl) by smtpq1.tilbu1.nb.home.nl with esmtp (Exim 4.60) (envelope-from ) id 1JTQiT-0002dj-6C for freebsd-multimedia@freebsd.org; Mon, 25 Feb 2008 00:57:09 +0100 Received: from cp1228410-a.dbsch1.nb.home.nl ([84.27.217.164]:55149 helo=desktop.homenet) by smtp3.tilbu1.nb.home.nl with smtp (Exim 4.60) (envelope-from ) id 1JTQiS-000064-Nq for freebsd-multimedia@freebsd.org; Mon, 25 Feb 2008 00:57:09 +0100 Received: by desktop.homenet (sSMTP sendmail emulation); Mon, 25 Feb 2008 00:56:18 +0100 From: "Danny Pansters" To: freebsd-multimedia@freebsd.org Date: Mon, 25 Feb 2008 00:56:18 +0100 User-Agent: KMail/1.9.7 References: <200802230159.BAA24291@sopwith.solgatos.com> In-Reply-To: <200802230159.BAA24291@sopwith.solgatos.com> X-Face: (Zs+'ncTcchkOX|~t6{?Iii=O!G#WEK!+OD0|-F=i%1pvP5V_Sz4PaJC8o)=?utf-8?q?MiSnH/JMJFy=0A=09oBN-My?=, v":S7, (=?utf-8?q?mmkPm=27U=7BMgT+eM=2EBd=5Cp/P!dr=5DhOTXqpse21O!=25Ct=60SE=2EOodq?= =?utf-8?q?=5Dry=5E=23kU=5E=0A=09-?=GT.[8D}i$6P>=" =?utf-8?q?=23=0A=09*J+4d=7E?= MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200802250056.18550.danny@ricin.com> X-Spam-Score: 0.0 (/) Subject: Re: Kbtv2 beta2 uploaded X-BeenThere: freebsd-multimedia@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Multimedia discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 24 Feb 2008 23:57:11 -0000 On Friday 22 February 2008 18:59:44 Dieter wrote: > > > > Your card seems to have a microtune tuner mt2050 which is not yet > > > > supported by the saa backend. I'm looking into it. Unfortunately it > > > > differs from the other generic tuner APIs for saa in that tuning and > > > > init are to be handled differently (mt2032 is supported by bktr, so I > > > > can peek there). THis is an important tuner to have support for > > > > though for several reasons: > > > > > > > > - it's on a chip, not in a large chunky metal enclosure > > > > > > I have read that the very small USB tuners don't perform as well as the > > > "large chunky metal enclosure", because some features were left out. > > > > Well, they don't have an mpeg encoder chip, but neither do the old > > fashioned analog TV cards. Of course, supporting that A/V decoder is > > another matter. But so is supporting an onboard mpeg encoder. > > > > They seem to use empia chipsets almost exclusively, the variant without > > onboard MPEG encoder is called the "blackbird" design IIRC. > > No, I mean the reception performance, not mpeg features. The "big" metal > cans supposedly have better RF filtering. Keeping the undesired > frequencies out is important. I've been looking into how they work and what they do is they have two IF stages. They demodulate to higher frequencies first (order 1200 MHZ) then do the usual demod to actual IF (for PAL, ntsc, but also QAM etc). Supposedly this makes it possible to discard a lot of noise. That's how they can make the chip useful for so many types of applications (including mobile). So it has two seperate PLL loops with the same crystal for reference signal. At least , that's how I understand it so far. I'm not done studying it yet. Dan