HDTV
The high definition television (HDTV) system has been proposed as a new television system for replacing the current television system. A high definition television system is capable of not only improving the quality of the picture and sound, but is also capable of providing powerful visuo-psychic effects with far more realistic and sharper pictures than the current system. Transmission of digitized television signals makes it possible to deliver video images of a much higher quality than that of analog signals. When an image signal comprising a sequence of image "frames" is expressed in a digital form, a substantial amount of data need be transmitted, especially in the case of high defition television (HDTV) system. Generally, in an HDTV system, a synchronizing signal is added before a signal is transmitted in a unit of a horizontal line from a TV broadcasting station. An HDTV receiver detects and demodulates the pilot signal, in order to recover the carrier. A receiver receiving the transmitted signal detects the synchronizing signal from the transmitted signal, synchronizes the transmitted signal with a horizontal line signal, and then processes the synchronized signal. HDTV digital video data is compressed and encoded using the MPEG 2 format into a data stream known as the DTV transport layer. The MPEG-2 standard is actually several different standards. In MPEG-2 format several different profiles are defined, each corresponding to a different level of complexity of the encoded image. MPEG-2 video is used to support both high-definition television (HDTV) and standard-definition television (SDTV). The video frames in HDTV are of higher resolution than those used in present NTSC signals while the video frames of SDTV have approximately the same resolution per frame as the existing analog NTSC standard. Generally, for an HDTV, a television broadcasting station inserts a sync signal in front of signals transmitted in units of horizontal lines, and a receiver detects the sync signal from the transmitted signals, synchronizes the horizontal line signals, and processes the received signal. According to their types, HDTVs have different formats of transmission data of horizontal lines.
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