HDTV Home Theater Systems Plasma Projection LCD

HDTV Home Theater Systems Plasma Projection LCD

Home Theater Systems HD TV Formats

Plasma Moniters-have tiny pixels of gas that are illuminated when charged by electrodes.

Liquid Crystal Displays-Have liquid crystals that control the amount of light passing through them.

Rear Projection TVs-have three cathode ray tubes that project video signals onto a mirror and onto a screen. LCD rear projection is also availble and offers a sharper picture than conventional rear projection.

Cathode Ray Tube-Uses an electron gun that scans across the phosphor coated screen.

Projection TV-Used for presentaions to large groups and in Sports Bars.

Viewing Angle-Assume that looking straight at the TV Screen is 90 degrees. A viewing angle of 45 would be halfway to the side. Some Suppliers Express the angle from side to side or 180 Degress.Therefor a 120 degree viwing angle would be the same as 30 degrees.

Home Theater Systems What you should know about High Definition Television. The signal comes from broadcast television. Your DVD player does not have an HD signal output. The HDTVs dislpay a dazzling picture from an HD signal. There is a common misconception that a digital cable signal is also and HDTV signal. It is not. Cable companies can transmit HD signals but they must transmit them on a higher band width than a digital or analog siganl. Normally a seperate block of channels is devoted to HD signals and the number is indeed limited.
The Plasma Screen HD TVs are thin and expensive. Be aware that an image can burn into a plasma screen as it did with the CRT moniters on your computer. The display is truely incredible. LCD displays have not been available in large screens until recently. New methods of mass producing the glass for the LCD screens are comming on line which should greatly reduce the price of LCD displays. The picture quality will competes on an equal basis with the Plasma Screen and will not "burn In" an image which can occur with a plasma screen. Side by side the LCD screen seems to provide more depth. The Rear Projection HD TVs also provide a superior picture and are less expensive that the other types of High Definition Television Sets. Only you know exactly what you want. Check our suppliers and select the system that meets your needs.

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HDTV Home Theater Systems Plasma Projection LCD

Issues in HDTV A. Bandwidth limitations A best, one cycle of an analog video frequency can provide information to two pixels. (NOTE: This is AT BEST -- it can easily be argued that one cycle only provides full video information to one pixel!) A conventional NTSC image has 525 lines scanned at 29.97 Hz with a horizontal resolution of 427 pixels. This gives 3.35 MHz (assuming 2 pixels per video cycle) as a minimum bandwidth to carry the video information without compression. If one decides to move to an HDTV image that is 1050 lines by 600 pixels (keeping the same frame rate), then this means a bandwidth of 18 MHz. Clearly we have a problem here -- as the current terrestrial channel allocations are limited to 6 MHz! (As an aside, the word "terrestrial" as used by TV people means conventional wireless TV transmission. This is to differentiate it from satellite or cable.) The options for terrestrial broadcast (assuming a 20 MHz bandwidth) are roughly as follows: 1. Change the channel allocation system from 6 MHz to 20 MHz. 2. Compress the signal to fit inside the 6 MHz existing bandwidths 3. Allocate multiple channels (2 with compression or three without) for the HDTV signal Options 1 and 2 are virtually incompatible with current NTSC service. About the only possibility for maintaining compatibility is simultaneous broadcast of NTSC information over certain channels and HDTV information over other channels. Option 3 does allow compatibility -- as the first 6 MHz of the signal could keep to the standard NTSC broadcasting and the remaining be additional augmentation signal for HDTV. Typically, in this type of augmentation system, an existing VHF channel would be tied to one (or two) UHF channels. The VHF channel would carry information similar to the current NTSC signal and the UHF channel (or channels would carry augmented high resolution information). B. Distribution -- terrestrial? satellite? cable? Advocates for HDTV systems fall into two major categories. There are those that feel that these systems will ultimately be successful outside the conventional channels of terrestrial broadcasting. Equally vehemently, are those that think HDTV can and must use existing terrestrial broadcast channels.

HDTV Home Theater Systems Plasma Projection LCD