Why HDTV is better
Why is digital television better than standard analog TV?
HDTV comes from a digital receiver. With Digital Television (DTV) the pictures and images are so clear, bright, true-to-color that they look real.
Digital TV has no ghosts, interference, snow, or artifacts. Digital sound is completely engulfing, like being at the movies or at the real event. You feel like you're right in the middle of the action.
What is Digital TV vs Standard TV?
The difference between a digital signal and standard (analog) signal is that analog signals contain only the video signal and nothing else. Analog signal is subject to weather, terrain, interfering obstacles, and has to be very strong in order to produce a clear unobstructed picture.
Digital signals are encoded to relay the visual and audio information to the receiver. These digital codes are not subject to the same types of interference. The signal is either there or it isn't.
High-definition television (HDTV) is ultimately all about improved viewing experiences using much higher, vastly improved higher technological standards: vastly increased resolution via digital transmission when compared to standard definition television (SDTV also known as analog), which until recently has been the normal viewing experience. And unlike analog or SDTV, HDTV is transmitted via a digital format. This means that more details, colors, pixels and finer, life-like features can be transmitted through a single communications channel through satellite, fiber optics and airwaves.
People using rabbit ears and TV antenna now must have convert to a digital converter box as the analog signal has been discontinued.
Conventional television has less horizontal and vertical resolution than HDTV, which can display programs of up to 1080 lines of resolution compared to 400-700 lines of resolution in SDTV (the exact resolution depends on which SDTV broadcasting system is being used).
The width of the image is also different in HDTV, which uses a 16:9 aspect ratio (for every 16 dots horizontally there are 9 lines vertically) instead of SDTV's 4:3 aspect ratio.
Thus when 1080 lines are being displayed, an HDTV set has a resolution of 1920 dots across. This is a very big difference when compared to NTSC, the SDTV standard used in North America, which has a horizontal resolution of 720 dots and a vertical resolution of 480 lines. The result is a much larger picture for HDTV broadcasts.
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