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Whether (And When) To Buy HDTV?
zzxc writes "A NBC local station in Indiana is carrying an article on whether it is smart to buy a high definition television now or later. While it isn't very technical, it does provide some practical insight. Keep in mind that the FCC deadline for television stations switching to HDTV is December 31, 2006." I don't think I want another television screen that can't also be a computer monitor.
Gametab - Game Reviews Database
The 2006 deadline is for having DIGITAL broadcasts, *not* High-Definition. They are two seperate issues right now. While there will be a set-top adapter available to convert digital to analog for older TVs, it is unknown as to whether or not these will actually be inexpensive enough to warrant not just purchasing a new television set. It is also very likely that stations will maintain an analog broadcast if it proves to be useful in their area (perhaps where the demographic is not likely to upgrade old systems).
Hear that, CBS? You'd better keep analog up for your demographic (the old farts that don't want to give up their old console Zenith from the 1970s).
Jethro73
Quidquid latine dictum sit, altum viditur.
This called HAVi - Home Audio Video integration. Read more at http://www.havi.org/
An issue near and dear to my heart:
First off, I bought an HDTV capable RPTV (rear-projection television) in April of 2002. It's a nice set, I mainly bought it because it was highly discounted as a customer return, a few scuffs, and nearly 40% off the normal price so I jumped on it.
My main motivation was to have a 16:9 format television because I love widescreen and can't stand mangled versions of movies designed to squeeze into the wrong sized screen. (See the Widescreen advocacy site for more info.).
This set has Y-Pr-Pb input (wideband component) which and supports 480p and 540p/1080i and upscales 480i beautifully. The results of this is gorgeous displays of widescreen DVDs.
My intent was to eventually have some HDTV to watch, but it hasn't happened. First, I live in an apartment. My cable company is clueless and does not carry any HDTV programming. There are some that do (Time-Warner Houston - 9 channels). My other options are satellite, or local broadcast. Neither of which really thrill me with the aspect of having to ask my landlord about installing stuff on his roof.
Aside from actually having the signal available, usually with satellite you need more than the basic receiver box you get for free when you sign up, you need one that goes for $400+ (last I checked it was 500). So that sucks.
So, net result, I own an HDTV set and still don't get to watch any high-res content. I'm happy though since my anamorphic widescreen DVDs look gorgeous. But I'd love to have some HDTV to watch. Eventually....
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Just a side note: The us "deadline" for digital TV does not mandate high definition, just that stations broadcast in digital format, which could simply be 480i upscaled to 480p (which is one of the standard digital formats).
In practice, a phase locked loop creates a frequency comparable with the broadcast carrier frequency, and this frequency is "mixed" with the incoming signal (using a non-linear circuit, which is often a diode or simple transistor circuit). The resulting signal has 4 components, spectrally, at the two original frequencies, their sum and their difference. The difference one is kept (because it effectively eliminates the original high frequency carrier) and the other three are elminited with a simple low-pass filter. The PLL accurately creates exactly the right frequency (well, as accurate as the quartz crystal it has), and the "groping though" the spectrum is an extreemly simple circuit and a low pass filter. There is also the small matter of automatic gain control, but it's also an easy circuit.
This is really pretty simple, and it's been done this way since the days of vaccume tubes... with the exception that the oscillator was tuned by adjusting a coil or capacitor value rather than with a phase locked loop. The reason PLLs are used today is because the complex silicon is less expensive that the coils (involved winding wire) and their moving parts which needed to be calibrated at the factory to match the official broadcast frequencies.
No, the receiver decodes the signal. That's the easy part. It's the tuner that has to find the damn signal to begin with.
As I just described, the modulation of the signal from the RF carrier is quite simple. Tuners were made back in the days when TVs had only a dozen tubes and passive parts hand soldered between the tube sockets (before circuit boards were in common usage).
The comb filters used in all modern receivers, which separate the chrominance from luminance data, are actually quite complex digitial filters (though not expensive with today's technology AND economy of scale). In the old days, the signal was simply low-pass filtered (around 2 MHz) to remove the color signal and capture the luminance.
The thing to keep in mind about tuners is that they've been around a long time.... and they've been implemented long before transistors. Even "cable ready" tuners roughly equivilant to today's were on the market in the mid 80's, when semiconductor technology was at the level of the 4.77 MHz IBM PC and 8 MHz Machintosh.
The TV tuner really isn't that big of a technical challenge.
PJRC: Electronic Projects, 8051 Microcontroller Tools
I'll admit I didn't finish reading all the responses (I will - this subject has particular interest to me) but after plowing through ca 100 posts w/o any actual real World experience, I had to pipe up:
Slashdotters should realize that a decent (not great) PC with some free software and inexpensive hardware can be the key to nearly State-of-the-art (compared to the stuff in the retail chains) TV exceeding kilobuck HDTV sets. A spectacular home theater is within the reach of a dedicated high school fry cook working at McDonalds and living with their folks. In fact, get your folks to chip in, and it's *easy*. In Home Improvement, we call it "sweat equity": creating with work and know-how something that would cost mucho dinero to buy (plus learning a thing or two as a major benefit -- I can easily afford an HDTV at Best Buy, but that would be boring to me, or even pointless)
1) Some starting points for real-world solutions:
AV Science: where I hang out now (esp. the HTPC forum, whose Linux section could use more programmers!)
Keohi HDTV (they helped me get started, I assume they're still good)
The Home Theater Spot: Admittedly, a home for guys with more dollars than sense, but at least they experiment instead of spouting sales literature at each other. They also had some great group buys from One-Call, which is as good as it gets for both support and service (if you want to buy)
2) Only now am I retiring my original HTPC (Home Theater PC), a Celeron-466 with 256 MB, a $20 TV card, and a $45 Matrox 450 DualHead with s-video, composite and XVGA outputs - a simple system that would still wow a lot of 'retail buyers'. I can't explain how it changed my TV viewing, how great it is to have a library of 150-300MB archived eps of my favorite shows, etc. Add a few sub-$1/GB HDDs (see Anandtech Hot Deals or FatWallet for bargains), and you'll wonder how you ever tolerated clumsy VHS tape libraries. For archiving, these same forums will tell you how to get 4x DVD-R recorders for as little as $140 at major chains (epending on sales)
3) My current aging workhorse is a Athlon 1700+XP ($209, barebones, from Outpost.com a year ago). I added memory, a sub-$300 MyHD card (some other HDTV cards are as good or better) and a few minor bits like a $50 Dolby Theater Sound card, etc. It'd be much cheaper today, and many of you already run gear that's much hotter than this. The software was mostly free and/or open source.
4) My favored output device is a Toshiba TLP650 LCD projector (native 1024x768, but with a nice 1600x1200 mode) cost $900 on eBay last year - a bit pricey, but that was last year and the last-gen prices are dropping fast. On President's Day (Monday) I got my GF a nice 640x480 projector to experiment with: under $100, and it exceeds the line resolution of any 'normal TV'. You can assemble a decent HTPC/projector for about the price of a "pretty nice" normal TV if cash is tight, and you'll have far more capability, like HDTV and HDTV *recording* (which runs a few kilobucks by itself, retail). Admittedly, I'm comparing "MSRP" TV prices to bargain-hunting for HDTV, but hackers have always been scroungers, right?
To me, the learning is the biggest benefit. I'm not a big fan of most TV, but building my HTPC has been a wonderful (and not *that* pricey) hobby. I don't need cable when most of what is sold locally as "digital cable" doesn't come close to the 1080i resolution I pick up with a $20 "double bowtie" antenna from Radio Shack (As a general rule, any antenna that calls itself an HDTV antenna will be *worse* than a cheap 1950's retro-looking double bowtie)
When your videos are always on your HDD, you'll rule in Geek Debates on SF tech or plots (one-click access encourages the invaluable habit of rigorous fact-checking). You can make outrageous SF music videos or parodies, and otherwise exercise your creative and intellectual side instead of being purely a passive couch potato. Modesty prevents me from linking my own videos, but I'd gladly recommend a friend's site of example TV-SF music videos and parodies