Finding Answers to Questions

Understanding TV Terms

What are analog TV, digital TV, and high-definition TV (HDTV)?

Devices such as monitors, tuners, and integrated monitor/tuner combinations are designed to handle any of the 18 formats officially sanctioned by the industry-led standard setter, Advanced Television Systems Committee (ATSC), for the digital transmission of video signals. There are three subgroups of digital televisions depending on their capabilities: high-definition (HDTV), enhanced-definition (EDTV), and standard-definition (SDTV).

In contrast, U.S. analog television has been available for over 50 years in the single National Television Standards Committee (NTSC) format. This is the signal format that has been broadcast over the air and through cable systems. NTSC television offers slightly more than 480 interlaced lines of resolution.

To view high-definition programming, your TV must receive high-definition signals by means of a high-definition signal source connected to the television. The source can be an off-the-air high-definition antenna or cable HD signal, or an HD source, such as a cable or satellite provider HD set-top box, an HD-DVD player, and so on. All sources, except an HD antenna or cable HD signal, must connect to one of the High Definition Input connector sets on the rear of the TV. Your cable or satellite provider may require additional purchase for high-definition programming; off-the-air high-definition broadcasts may not be available in all areas.

What is the difference between progressive and interlaced signal formats for digital TVs?

There are 18 standard digital TV signal formats. Each provides a different picture quality. The names of these digital TV formats consist of a number followed by either p (progressive) or i (interlaced). The letter refers to the way the TV uses the signals to create the picture:

■Progressive (p) scanning presents all the horizontal lines of the picture in one frame. This provides a sharper picture to the eye, and looks much better than an interlaced image of the same resolution.

■Interlaced (i) means that the picture appears in two segments; every other horizontal line of the picture is displayed in one frame, and the other half of the horizontal lines are displayed in the next frame. This works because it happens so fast that the eye is deceived into believing that only one picture is being shown.

The number in the names of the formats refers to the number of lines of resolution. Generally speaking, the higher the number, the better the picture. For example, with digital TV (DTV), there are two progressive formats for broadcasters to choose from: 480p and 720p. 480p has 480 horizontal scan lines. Although the 480p image is much sharper than a regular TV broadcast, it is considered only a DTV signal and not a true high-definition signal. 720p has 720 horizontal scan lines and is considered to be true HDTV. 720p can rival a 1080i picture, in which 1080 horizontal scan lines are displayed as an interlaced image. The sharper and more accurate (progressive) 720p picture looks better, even though a 1080i picture has many more scan lines and a much higher resolution.

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SL4778N 47 inch, SL4278N 42 inch specifications

The HP LC3772N, PL4272N, PL5072N, LC4276N, and SL4278N represent a diverse range of plasma television offerings that cater to various viewing preferences and room sizes.

Starting with the HP LC3772N, this 37-inch plasma model is ideal for medium-sized living spaces, providing high-definition display quality. The LC3772N boasts a resolution of 1024x768 pixels, ensuring that viewers can enjoy crystal clear images with vibrant colors. With a refresh rate that minimizes motion blur, this model is perfect for watching fast-paced sports or action films. The unit also features multiple connectivity options, including HDMI and component inputs, allowing for seamless connection with gaming consoles and other multimedia devices.

Next, the PL4272N is a 42-inch plasma television that enhances the viewing experience with its larger screen size and advanced features. It offers similar resolution capabilities as the LC3772N but adds improved contrast ratios, enhancing picture depth and clarity. The PL4272N supports 720p high-definition video and includes built-in speakers designed to elevate audio output. This model is known for its wide viewing angles, making it suitable for gatherings with family or friends, ensuring everyone enjoys a stellar view.

The PL5072N takes this performance a step further with a generous 50-inch screen, suitable for a more immersive home theater experience. This model features 1080p full HD resolution, delivering stunning visuals with rich detail that enhances movie nights and gaming sessions. The advanced plasma technology used in the PL5072N offers deeper blacks and brighter whites, creating an impressive dynamic range. Its sleek design and thin profile also make it an attractive addition to any living room decor.

The LC4276N stands out in the 42-inch category with its innovative energy-saving features, making it not just a visual delight but also an environmentally friendly choice. Equipped with advanced image processing technologies, the LC4276N delivers enhanced color accuracy and sharpness.

Finally, the SL4278N is another 42-inch plasma television that showcases a modern design and smart features. It delivers stunning picture quality with low input lag, appealing to gamers who demand responsive gameplay. The SL4278N includes networking capabilities, enabling users to enjoy streaming content from popular services directly on their screen.

In summary, these HP plasma models vary in size and features but all deliver exceptional picture quality, making them suitable for varied viewing preferences and settings.

HP SL4278N 42 inch, SL4778N 47 inch manual Finding Answers to Questions, Understanding TV Terms

Models: SL4778N 47 inch SL4278N 42 inch