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    How Does High-Definition Television?

    How Does High-Definition Television?

    Broadcast signals

    There are three ways to receive a TV signal in HD:

    • Terrestrial Broadcasting: currently exist in Spain more than 30 channels that are broadcast by digital terrestrial television. To view you must have a digital tuner.

    • Cable: many cable systems offer HD movie channels and regional sports of payment as well as some local HD broadcast channels.

    • Satellite: the satellite television channels continually expand its offerings in high definition. Also, there is currently programming on Art, Music, Entertainment, Extreme Sports and Travel in high definition available throughout the day via satellite. You need a special HD receiver satellite. The availability of broadcast channels in high definition varies depending on the local market and the satellite provider.

    What is the difference between analog and digital broadcasts?

    Analog broadcasts are limited to the transmission of image and audio occupying an 8MHz channel bandwidth. Besides analog broadcasts are subject to interference and noise. Digital broadcasting, using the same bandwidth to transmit up to 4 channels or services in standard definition televison, up to 5.1 audio channels for each service and even information data, whether for interactive applications or applications and updates service software. These signals are free of noise and interference and the reception quality is the same quality at the time of retransmission. On the other hand instead of issuing 4 channels in standard definition, it can issue 2 and 1 standard-definition HD 1080i or 720p. Or two in high definition 1080i or 720p, or a channel in full HD 1080p.

    Broadcasting

    With analog broadcast signals, the reception quality is directly related to the quality of the signal. However, in the case of digital broadcast signals, the quality is the same on your TV regardless of the strength or weakness of the signal strength, unless there is no signal.

    Image Processing

    TVs old and new are composed of a series of horizontal lines, which in turn are composed of tiny dots, called pixels. The number of lines and points determine what is called “resolution.”

    Resolution

    The TDT can deliver 4 channels in standard definition, or 2 channels in standard definition and 1 high definition 1080i or 720p, or 2 in high definition 1080i or 720p, or a channel in full HD 1080p.

    These differences are also reflected in the shape of the signal: SD signals have a “standard” form (with an aspect ratio of 4:3) and HD signals are formatted as “widescreen” (with an aspect ratio 16:9). HD is different on this issue further, issuing two signal formats: 720p and 1080i x 1280 x 1920, interlaced first and second progressive, although it is virtually impossible to discern any difference.

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