Date: Wed, 27 Feb 2008 00:09:36 +0100 From: "Danny Pansters" <danny@ricin.com> To: freebsd-multimedia@freebsd.org Subject: Re: Kbtv2 beta2 uploaded Message-ID: <200802270009.36449.danny@ricin.com> In-Reply-To: <200802250103.BAA25580@sopwith.solgatos.com> References: <200802250103.BAA25580@sopwith.solgatos.com>
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On Sunday 24 February 2008 18:03:47 Dieter wrote: > In message <200802250056.18550.danny@ricin.com>, "Danny Pansters" writes: > > 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). > > I think you mean "frequency shift" aka "mix" rather than "demodulate"? Yes :) Jargon overload... > > http://en.wikipedia.org/wiki/Modulation > http://en.wikipedia.org/wiki/Frequency_mixer > http://en.wikipedia.org/wiki/Heterodyne > http://en.wikipedia.org/wiki/Superhet > _______________________________________________ > freebsd-multimedia@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-multimedia > To unsubscribe, send any mail to > "freebsd-multimedia-unsubscribe@freebsd.org"
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