480i, 480 p, 720 p, 1080i and 1080p what does it all mean?
Standard TV from the days of black and white to the present color images we watch every day on television are made up of a series of still images displayed at 60 frames per second in the US and 50 frames a second in Europe. These still images consist of individual lines of information that move from left to right across the screen followed by more lines moving down the screen. With a Cathode Ray Tube (CRT) that most older TVs' use for the display, the flat surface that you look at is coated on the inside with phosphor dots or rectangles. A beam of electrons vol.1 is aimed at the dots or rectangles causing them to glow. With a standard definition TV there are 480 of these linesand 640 sets of dots or rectangles on each line. Each set of dots or rectangles consist of three color dots (Red Blue and Green) and the power or intensity of the electron beam determines how bright each color will be. There are actually three beams moving together across the face of the screen, each changing in intensity as they cross the phosphor dots or rectangles.
Interlaced (i) or Progressive (p)?
50 Inch Led Tv
In order to reduce the bandwidth, normal TV signals only send 30/25 frames a second to the receiver made up of only 240 lines of information. If that were all we saw on the screen it would look like the old flickering movies. Within the TV set the signal is processed and sent twice to the CRT, the odd numbered lines are scanned and then the evennumbered lines are scanned with the same image. This is referred to as an interlaced image and eliminates the flicker. However the true vertical resolution is only 240.
With a progressive image, 60/50 frames a second are sent to the receiver and all of the lines are scanned once for each frame and providing twice the detail as the interlaced image with the same screen. However this requires twice the bandwidth. Keep in mind that non-digital over-the-air is only 240 lines of original information, you can use a line doubler or scaler to increase the number of lines, but it will never be as sharp as the original image.
Horizontal resolution is much simpler, it is basically just the number of dots, or pixels rectangles across the width of your screen. For example standarddefinition TV is 640 X 480, the horizontal resolution is 640 for both interlaced and progressive.
Standard Definition DVD Full Screen and Wide screen
With the introduction of DVDs ' the horizontal resolution was increased from 640 to 720 to show the wider images of the original movies. Displays with a resolution of 720 X 480 "could show these movies using the full screen width, however when viewing standard TV images, the people are slightly fatter.
Enhanced Definition TV
This format uses progressive scan and an even wider image for "854 X 480" and though is much better than standard TV it still does not come close to High Definition TV. Standard TVS usually have a black bar on eachside as the people would look weird being so fat.
720 p High Definition TV
This format was a big step forward, however when viewing regular TV, you were still stuck back in the old format of "640 X 480". 720 p displays have a resolution of 1280 x 720 "and use progressive scan for a very sharp image. Scalers and converters are used to boost the quality of the TV images to match the screen. For Analog signals, equipment and Component video cables are a minimum requirement. Video and S-Video will not work. The TV set may accept Video and S-Video, but will not take advantage of the full resolution, displaying a smaller image or through processing in the TV provide a larger image though not as sharp.
TheGovernment steps in with 720 p and 1080i high Definition TV Standards
On February 17, 2009, television stations will stop all analog broadcasts and only broadcast digitally. Older analog TVs will require converter boxes to receive over-the-air programming. Cable or satellite service will not be affected. There are two formats that will be used by the different stations.
The 720 p format makes a picture with 720 vertical lines, each with 1280 pixels horizontally or a resolution of 1280 x 720. 720 p uses progressive scanning, like computers, which sends a complete picture 60 times per second. 720 p provides the smoothest possible motion rendition, but it does not have as much resolution as 1080i.
The 1080i format makes a picture with 1080 verticallines, each with 1920 pixels horizontally or a resolution of 1920 x 1080 ". 1080i uses interlaced scanning, like traditional TV, which alternates sending odd lines and even lines and thus sends a complete picture 30 times per second. 1080i provides the highest possible resolution, but has the same motion rendition as traditional TV.
1080p High Definition DVD
Your next DVD player will most likely be able to play 50 Gbyte DVD's that will use an High Definition Multimedia Interface (HDMI) that will also supply up to 7 channels of high definition audio along with the 1080p image. This is quickly becoming the standard for DVD movies in the same way that VCR tapes DVD replaced a few years ago.
To view these movies you will need an HDTVdisplay with HDMI inputs and a DVD player capable of playing the new format with HDMI output. You will also need special cables HDMI to connect the two. Your cable or satellite provider will also use HDMI connections so you will need at least two HDMI connectors on your display device.
There are some drawbacks to the current models of High Definition DVD players. High-bandwidth Digital Content Protection (HDCP), creates a slow down when starting a movie, you may think that you have a problem with your DVD. The player is just talking to the display device to make sure that they are both licenced properly. Unless you are viewing the DVD on a 42 inch or larger screen you will have a hard time telling the difference between 720 p and 1080p.
Broadband what does itmean?
You may be using broadband now and not even realize it. How often do you select an online movie from your local cable or dish company? Have you noticed how many high definition features are now being offered? As the selections become larger, watching streaming content will become so common that we will slowly forget about our DVD players. 720 p is very common and soon 1080p will also be available. The protection for the movie producers is already there as the high definition boxes use HDMI with HDCP for the high definition outputs.
Organic Light Emitting Diode (OLED) TV's
Toshiba REGZA 42-Inch 1080p LCD HD TV Tube. Duration : 5.30 Mins.Visit tiger.tv to learn more about the Toshiba REGZA 42-Inch LCD. Experience the full power of High Definition Television, movies, and sports with the Toshiba 42HL167 42-Inch REGZA LCD TV. Featuring full 1080p native resolution for complete 1:1 high definition playback, the REGZA LCD TV from Toshiba is the ultimate Home Theater Television. There are plenty of other technologies incorporated into this impressive HD Flat panel as well—from ColorBurst LCD panels to PixelPure 3G14 Internal Digital Video Processing. Combine this with 8ms response time and a complete spectrum of video and component connections, and you'll have an LCD that will wow the neighbors for years to come! Experience the true power of HD television. Get the Toshiba 42HL167 42-Inch REGZA LCD TV today!
Keywords: Toshiba, REGZA, 42-Inch, 1080p, LCD, HD, TV, tigertv, tigerdirect, computertv
0 comments:
Post a Comment