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Appendix 4 Scan Mode (Interlace and Progressive)
Interlace scan (such as 480i, 1080i) refers to display separately the whole picture into two
interactive pictures of odd field and even field. It helps to reduce the flicker degree of TV
display.
Progressive scan (such as 480p, 720p, 1080p) means to scan a whole picture line by line.
Progressive scan picture is more stable than interlace scan picture.
To divide the scan mode into Progressive and interlace are mainly for the purpose of giving
attention to the traditional display device such as TV. Generally, Interlace scan does good to
those motive images changing so fast, while Progressive scan adapts to displaying still images
with high resolution. In the long run, Progressive scan has a brighter future in its application.
Appendix 5 HDMI Introduction
HDMI (High-Definition Multimedia Interface)
is the first digital interface that supports
transferring uncompressed digital HD Video,
Multi-track Audio, intellective format and
control command data in single cable in the
industry. HDMI has already been the most
advanced multi-media interface standard
internationally. HDMI represents the
direction of digital transmission development
and intends to have greater influences.
HDMI originates from DVI standard, and both of them center on the TMDS signal transmission
technique of Silicon Image. Three groups of TMDS channels transfer the 24 bits pixel video
data by R/G/B or Y/Cb/Cr formats with the highest frequency of 165MHz. The actual video
transmission has a bandwidth near 4Gbps. Based on that, HDTV can easily deal with the HD
Video system. Actually, the superior high HDMI standard is more than sufficient compared to the
highest 1080p standard of HD video system (1080p needs a bandwidth of 2.2Gbps). HDMI has
enough bandwidth being able to offer supports to higher standard video system in a long period of
time in the future.
Furthermore, HDMI also offers supports to high quality audio signal transmission with the highest
8 channel and each channel reaches up to 192 KHz (note: DVI does not include audio signals, the
systematic audio signals must be transferred by other interfaces), but all these are done only in one
cable.