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Learn the Lingo HDTV Terms You Should Know Before Setting Foot in a Store
Before you go shopping for that new High Definition Television Set, there are
terms that you need to know. It's a frightening experience to be looking for
something that high tech, yet not understand a word the salesperson is saying. I
know. I've been there! You need to learn the terms, know the lingo, let the
salesperson know you've done your homework; you'll get a better deal if you do.
Let's begin with the basics. What's the difference between analog TV and HDTV?
Analog is what we have had for the past 50 years. It sends conventional TV
signals to consumers and is then broadcast on an analog TV. This was great when
it first appeared. It sends the signals continuously, but in doing so creates
changes in color and brightness.
Digital TV is a broad term that covers High Definition Television and other
applications such as data casting, interactivity, and multicasting. Digital
refers to the circuitry that carries the signals that have data.
Enhanced TV is simply down casting. Down casting is a term used that includes
added resources downloaded to viewers. Live interaction and downloading programs
to special receivers for reviewing later are two types of enhanced TV.
Pixel is another term that you need to be familiar with before shopping for a
new HDTV.
A pixel is a tiny square that has a sample of video information that make up the
overall picture on the television set. A pixel per inch or PPI is the measure of
the sharpness of the display screen. The more PPIs per inch the sharper the
picture. Pixels affect the resolution. The more pixels there are, the more
picture detail you have. High Definition picture formats are comprised of 1080
active lines and each line has 1920 pixels. Let's compare that with today's
analog TVs. The HDTV ends with over two million pixels per frame. The analog
only has 480 active lines, so the ration of pixels is about 200,000 as apposed
to the two million for HDTVs.
In addition, you will need to know that a digital tuner will be needed to
receive and display digital broadcasts. Some TV sets will come equipped with the
decoder and will be included within the TV or a separate box will need to be
bought to decode the signals.
Dolby Digital is the surround sound technology that movie theaters use and
larger home theater systems have. It works with five speakers plus a low
frequency subwoofer to produce true-to-life sound. The sound can put you in the
center of the action when you are watching TV.
Letterbox refers to the image you get of a wide-screen picture on a standard TV.
It typically has black bars above and below the picture. This maintains the
aspect ratio designed for the theater screen. Which is generally 16:9 or wider.
Many cable companies provide digital Cable. Digital cable offers viewers more
channels but is not the same as digital television. A digital monitor is a set
up box that can display a digital signal through an added set-top box. Many
HDTVs will have several items including a set-top box, a DVD player and a DVR.
DVR is my favorite function of the HDTV. It allows you to record a set number of
hours without programming a VCR. It's much easier to use, lets the quality of
the HDTV be seen and can be watched anytime you want to see the program you
recorded. It's perfect for the nights when there will be something on TV that
you want to watch but can't be home to see it. With DVR, you can fast-forward
through the commercials, rewind to review a part you didn't hear clearly, and
keep it on the recorder until everyone in the household has had a chance to
watch it.
Wide-screen is a term given to picture displays that are wider than the standard
analog TV. The National Television Systems Committee has set the standard for a
regular analog set for 4:3. A HDTV is set with a screen ration of 16:9. That
means if the screen is nine inches tall, it is sixteen inches wide. If you were
watching a show that was shot in wide-screen format on, a regular sized analog
TV you would notice the edges being cropped. You see more of the picture on a
wide-screen TV.
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