Digital View DVR-810, Owner'S Manual

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6
Overview Overview
7
Television Signal Formats in Australia
Analog TV vs Digital TV
The Australian Standard for both analog and digital TV transmission is based on variations of the
European Standard of PAL and DVB.
All analog TV broadcasts are transmitted in the PAL-B/G format while all digital TV broadcasts are
transmitted using the DVB-T (T - Terrestrial) standard. Both analog and digital transmissions utilise VHF
and UHF bands
The following table shows the basic differences between the Australian analog and digital TV
transmission formats.
Format Analog PAL
DVB-T Digital
Standard
Definition
High Definition
Active Lines /
Active Pixels
625 lines 576 x 720
576 x 720
720 x 1280
1080 x 1920
Aspect Ratio 4:3 4:3 or 16:9 4:3 or 16:9
Resolution/s 576i 576i (interlaced)
576p (progressive)
720p (progressive)
1080i (interlaced)
Video Raster MPEG-2 MPEG-2
Audio Analog Stereo
MPEG (2 ch)
Dolby Digital 2 / 5:
1 ch
MPEG (2 ch)
Dolby Digital 2 / 5:
1 ch
Interlaced (i) and Progressive (p) Scanning
Interlaced
format shows half of an image (on the odd rows of pixels) every fiftieth of a second, and then
shows the other half (on the even rows) the next fiftieth. Therefore, it takes one twenty fifth of a second
for a complete frame, giving a frame rate of 25 frames per second.
Progressive format shows one complete video image every fiftieth of a second, so the effective frame
rate is twice as high as interlaced - 50 frames per second. In general, the progressive format gives a
“smoother” quality picture than interlaced and specifically on larger screens.
Digital TV Transmission Formats
The current Australian Standard for broadcasting digital TV is set at four formats. These are:
576i - Standard Definition: 576 x 720 pixels at a frame rate of 25 complete frames per second.
576p - High Definition:
576 x 720 pixels at a frame rate of 50 complete frames per second.
720p - High Definition: 720 x 1280 pixels at a frame rate of 50 complete frames per second.
1080i - High Definition:
1080 x 1920 pixels at a frame rate of 25 complete frames per second.