101 Guides In Getting Dish Network : Avoid Common Satellite TV Scams!
How to choose the right HDTV antenna for your set-up. A Digital TV receiver isn’t concerned with signal strength, or what conditions exist between your set and the transmitter. As long as the signal gets to the receiver, and the code can be read, the Digital TV is able to reproduce a near-perfect picture – virtually identical to the original, back in the TV Studio.
A distinct advantage of digital broadcasting is that bad reception is a thing of the past. One reason Cable TV caught on is because it delivers clear TV pictures without regard to the viewer’s location. Viewers don’t have to be constantly adjusting the antenna in an attempt to “tune-in” a weak signal from a distant transmitter to get a clear picture. Digital TV (DTV) eliminates the “snow” and “ghosting” caused by the weak signals from distant or blocked transmitting towers. If the analog television set does not receive a strong, undistorted signal from the tower, you will not get a perfectly clear picture.
Both digital and analog television signals weaken, the farther they travel away from the transmitting tower. On an analog TV, the picture slowly deteriorates from bad to worse as the distance between tower and receiver increases. However, the picture on a digital set will stay perfect until the signal becomes too weak for the receiver to distinguish between a (1) and a (0), at which point the image disappears completely.
This has been referred to as “the cliff effect” – the picture remains stable until it abruptly “drops off” the screen. This might be compared to sending Morse Code. As long as the person at the other end can make out the dots and dashes being transmitted they will be able to read the message. Once they lose the distinction between a dot and a dash they lose the message. Digital TV acts the same way; instead of sending dots and dashes, it sends millions of (1′s) and (0′s) every second.
As long as the TV Receiver can read the (1′s and 0′s) it displays a virtually perfect picture. The bottom line … you either receive a 100% quality image, or nothing at all. What this means to the digital television viewer, is not having to worry about getting a “bad” picture. Either you have a picture or you don’t. However, if you are receiving over-the-air, “OTA” (Over the Air) broadcasts, it is crucial for the antenna to be accurately directed towards the signal source – the transmitting tower of the station you are watching.
Adding an “H” to ‘DTV’ = W O W! While our objective is to become familiar with HDTV basics, so far we have focused mainly on Digital TV – DTV. What then is HDTV – High Definition Television? And what is the difference between DTV and HDTV?
DTV differs from NTSC-analog TV in the technology used to transmit the signal. And we looked at some of the reasons why Digital is better than analog. But when comparing Digital TV or “SDTV” (Standard Definition TV) to HDTV, the difference is as night and day! High Definition Television is digital television – BUT … It’s IMPORTANT to understand that Digital TV does NOT mean HDTV! HDTV is just ONE of (18) ATSC designated formats that comprise Digital TV. In High Definition Television, the picture displayed on your television screen begins as an HDTV signal captured by HDTV Cameras, (or converted from film or another format with HDTV Equipment). The HDTV Signal is transmitted to the HDTV Receiver and finally displayed on an HDTV-Capable TV Monitor. But it must also meet the ATSC Standards for High Definition Television in order for it to be “true” HDTV.
Note: It is more than likely you will confront mis-information stating that Digital TV in various configurations is ‘high definition television.’ This is NOT True! You may also be told that as long as the TV meets one or two criteria, or if it has been enhanced by the Manufacturer, using some proprietary engineering “magic,” this makes it – “as good as” – HDTV. Again, NOT TRUE!
If what you want is HDTV, be sure the television you are considering, is really “True” High Definition Television. How Do you Know a TV is – HDTV? To answer this question a ‘bit’ of basic TV technology will be helpful.
It will be helpful in understanding some of the basic elements of HDTV by educating yourself. After all, this is a discussion about Digital-HDTV – possibly the most significant ‘leap forward’ in consumer-technology to impact our society in more than a century!
The image you see on your television screen is comprised of a series of horizontal lines. An electron gun ‘shoots’ energy beams (light) which strike a layer of phosphor on the inside surface of the picture tube, causing it to glow. These glowing lines create the image displayed on your TV screen. How they are formatted, which resolution is used, what standards are met, are some of the factors that determine the type of television picture you will receive.
TV Resolution.The quality of the picture displayed on the TV screen is primarily the result of the television’s “resolution.” Put simply, TV ‘resolution’ refers to how many horizontal lines are displayed on the TV screen.
Note – Although the horizontal lines are counted, (in this instance) this is referred to as the “Vertical resolution,” because the lines are counted from top to bottom – or vertically. TV Resolution is sometimes expressed as the total ‘pixel’ count, which is a product of the number of lines and number of pixels per line
Why Is “Wide-Screen” TV The DTV Standard?
DTV sets are sold in two ‘Aspect Ratios.’ Aspect Ratio refers to the ratio between the horizontal (width) measurement and the vertical (height) measurement of the screen. This ratio is also used in reference to how the picture is transmitted and displayed on the screen. The two aspect ratios used in DTV are (4:3) and (16:9). That is, (4) units wide by (3) units high, and (16) units wide by (9) units high respectively. Your NTSC-analog television has an aspect ratio of (4:3); the screen appears almost ‘square’ because it has just slightly more width than height. For instance, a (4′) wide screen would have a height of (3′).
Go to the link below to find more information on the Analog to DTV Transition on February 17th, 2009 before your left in the dark.
This brief introduction to Digital TV and HDTV basics, provides an overview (intentionally simplified) of how DTV differs from traditional Analog TV, and how HDTV differs from Digital-SDTV; and a little about the Transition from Analog TV to Digital TV. This is just a start towards a better understanding of Digital TV. Now that you’re familiar with some of the basics, you are better prepared to begin considering which Digital HDTV is right for you. Find more information about Exercise The Right Way – The Flat Bench Press here.
