TV Digital

Why Digital TV There are two primary reasons: Improved public safety, and The ability to deliver enhanced technology services to the public with greater efficiency.

The conversion to DTV will free up parts of the scarce and valuable broadcast spectrum. Those portions of the spectrum can then be used for other important services, such as advanced wireless (cellular) and public safety services (police, fire departments, rescue squads, etc.)

DTV is a more flexible and efficient technology than the traditional analog broadcast technology that has been in use since the early days of television. It provides enhanced signal quality and reliability, and offers consumers an improved viewing experience and greater programming variety.

For example, rather than being limited to providing just one analog-quality program per assigned frequency, a broadcaster will be able to provide either a super-sharp "high-definition" (HDTV) program or multiple "standard-definition" (SDTV) programs simultaneously. The number of programs a station can send on one assigned digital channel depends on the level of picture detail, also known as "resolution," desired in each programming stream. DTV can also support interactive video and data services that easily surpass those available via analog technology.

What is High-Definition TV (HDTV)? Contrary to a popular misconception, DTV is not synonymous with high-definition television. HDTV is the classification applied only to the highest-quality formats defined under the DTV standard, and achieves dramatic performance improvements over analog TV. The picture is up to six times sharper, with greater detail, more accurate colors and none of the interference (ghosting, snow) common to analog TV reception.

An HDTV image is also 33% wider, relative to its height, providing a sweeping, more cinematic viewing experience. Sound is dramatically improved as well; HDTV programming is broadcast in up to 5.1-channel Dolby Digital audio, offering fidelity and surround capabilities that far surpass those of traditional TV.

Not all digitally broadcast television signals are high- definition and it's equally important to recognize that not all digital TVs can display HDTV signals at full quality. Some lower-priced digital TVs, classified as standard- definition (SDTV) or enhanced-definition (EDTV), may be able to receive all types of digital broadcasts, but can only display them with reduced clarity. With these TVs, the improvement over analog TV performance is still noticeable, but less dramatic than with a true HD display.

What's the difference between an HDTV and an HD-Ready TV or HD Monitor? Currently, not all new sets and not even all HD- capable TVs include digital reception capabilities. Many sets currently on the market are what's known as "HD-Ready TVs" or "HDTV Monitors. These terms are interchangeable; a TV by either label is capable of high-definition display, but requires an HDTV source (an ATSC set-top receiver, or a cable or satellite box that is capable of high-definition output) to achieve true HDTV performance. Such HD-Ready TVs typically include a traditional analog (NTSC) tuner for the reception of standard analog broadcasts.

High-definition television (HDTV) masuk ke pasar pada tahun 1998 dengan resolusi super dan efek suara digital. HDTV dapat digunakan untuk menonton film dalam format aslinya (widescreen). Ide layar plasma dimulai pada tahun 1964 di Universitas Illinois. Plasma TV set terbaik mendukung High-Definition Video dan konektivitas digital dan analog. Plasma TV menggunakan teknologi yang berbeda dari model CRT yaitu menggunakan video yang disinyalkan oleh piksel pada layar datar kemudian diterangi sinar energi tinggi elektron yang terdiri dari tiga warna inti; merah, biru, kuning.