6
Resolution an interlacing
Two of the elements that determine the quality of a
TV picture are resolution and interlacing.
Resolution
For TV equipment and broadcasts, resolution is
defined by the number of horizontal lines displayed
to make up each frame of a video image. The more
lines of resolution used to draw each frame of
video, the more detailed and sharp the picture will
be. Standard TV resolution uses 480 horizontal
lines to make up each of video.
HDTV uses either 720lines, or 1080 lines to make
each video frame.
Interlacing
When TVs display video, they display a new video
frame at a rate that is faster than your eye can see
(from 24 to 60 frames per second, depending on
the TV and broadcast). Interlacing refers to whether
each of those frames contains all of the lines of
video for each frame or every other line. Interlaced
signals take every other line frame 2 frames of
video (each lasting 1/60
th
of a second), and
combine them into one frame lasting 1/30
th
of a
second. In this way, interlacing tricks your eye into
thinking it is seeing twice the resolution that is
actually being displayed.
In non-interlaced video, (referred to as progressive
scan video), video frames are displayed every
1/60
th
of a second containing all of the lines of video
information for each frame.
The specifications for video resolutions are usually
stated by giving the number of horizontal lines,
followed by either the letter I, for interlaced video, or p
for progressive scan video. Some DVDs and
non-HDTV digital TV broadcasts use 480p.
The ATSC specification for HDTV broadcasts and
equipment requires either 1080i or 720p. While there
is some debate as to whether it is better to have more
lines that are interlaced that 1080i is highest quality
video format.
Video output
The PHD-205 Digital HDTV Tuner is able to receive
broadcasts in any of the resolutions mentioned above.
It can also display programs on TVs capable of
displaying any of those resolutions.
To set up your PHD-205 to handle the combinations
of incoming video formats and TV display capabilities,
you simply set the Resolution Switch on the rear
panel to match the highest resolution your TV is
capable of displaying. (If you’re not sure about your
TV’s resolution, see your TV’s manual for this
specification.)
PHD-205 will then do the appropriate conversion
from input signal format to display format.
Video output formats
Output Connection
Available Formats
S-VIDEO 480i
VIDEO 480i
YPbPr 1080i/720p/480p
DTV(RGB) 1080i/720p/480p
DVI 1080i/720p/480p
Aspect ratio
In addition to resolution and interlacing, HDTV is also
defined by the aspect ratio of its broadcasts.
Aspect ratio means the shape of the screen as
defined by the ratio of the screen’s width to its height.
For analog TV and SDTV, the aspect ratio is 4 units
wide by 3 units high (usually written 4:3).
This is familiar shape of conventional TVs----slightly
wider than they are tall.
For HDTV broadcasts, the aspect ratio is 16:9 (nearly
twice as wide as it is tall).
This is, not coincidentally, more like the shape of
movies shown in theaters.
This makes HDTV an ideal format for broadcasting
and viewing movies on a TV.
But what happens if you are watching a nearly
square-shaped 4:3 broadcast on a rectangular 16:9
TV. The PHD-205 Digital HDTV Tuner allows you to
choose from a variety of screen formats to help you
dealing with those scenarios.
23
Operation
Analog Caption
You can select an available in these options.
CC1:
The Primary Synchronous Caption Service.
These are captions in the primary language that
must be in sync with the sound, preferably
matched to a specific frame.
CC2:
The Special Non-Synchronous Use
Captions. This channel carries data that is
intended to augment information carried in the
program.
CC3:
Secondary Synchronous Caption Service.
Alternate program-related caption data, typically
second language captions.
CC4:
Special Non-Synchronous Use Captions.
Similar to CC2.
Text1:
First Text Service. This may be various
non-program related data.
Text2:
Second Text Service. Additional data,
usually not program related.
Text3/Text4:
Third Text Service. These data
channels should be used only if Text1 and Text2
are not sufficient.
DTV Caption
You can select an available advance caption in DTV
Caption.
This item include
Advanced CC1
Advanced CC2
Advanced CC3
Advanced CC4
Advanced CC5
Advanced CC6
DTV Caption Style
This will adjust advanced settings such as text style
and size and etc.
It can be used into digital channel.
Text
Style
Typewriter/Storybook/ Computer/Modern/
Formal/ Cursive/Casual/ As Broadcast
Color
White/Red/Green/Blue/Black/Yellow/
Magenta/Cyan/ As Broadcast
Size
Small/ Standard Size/ Large/ As Broadcast
Opacity
Solid/ Translucent/ Transparent/ Flashing/
As Broadcast
Background
Color
White/Red/Green/Blue/Black/Yellow/
Magenta/Cyan/ As Broadcast
Opacity
Solid/ Translucent/ Transparent/ Flashing/
As Broadcast
Edge
Style
None/ Raised /Depressed/ Uniform/
Shadow left/ Shadow Right/ As Broadcast
Color
White/Red/Green/Blue/Black/Yellow/
Magenta/Cyan/ As Broadcast
*Factory default: As Broadcast
CC Preference
Choose whether to use “basic”, “advanced” or
“Automatic” closed caption setting for digital TV
channels. (Advanced closed caption is the priority)
)
When an Analog signal is received, you can
choose CC1, CC2, CC3, CC4, TEXT1, TEXT2,
TEXT3, TEXT4 and OFF.
When a Digital signal is received, you can choose
from Adv.CC1, Adv.CC2, Adv.CC3, Adv.CC4,
Adv.CC5, Adv.CC6, CC1, C2, C3, C4, TEXT1,
TEXT2, TEXT3, TEXT4, and OFF.
Depending on the broadcast signal, some Analog
Captions will function with a Digital broadcast
signal.
