5
Introduction
Resolution and 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 720 lines, 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 (non-interlaced) 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.
)
•
One of the enhanced features of PHD-8VX is to
allow scaling HD 1080i/720p video up to 1080p
@ 60Hz video quality. The results, video has
more fine pixels and vivid on many high-end TV
display.
Input formats
The PHD-8VX, Full HD 1080p HDMI A/V Switcher
Digital HDTV Tuner Receiver Media Box, is able to
receive broadcasts in any of the resolutions
mentioned above. It will then do the appropriate
conversion from input signal format to general TV
display format.
The table below details the results you get with each
combination of input signal format.
Type
Aspect
Ratio
Compression
Size Values
Frame
Rate
18
H
D
T
V
16:9
1920
×
1080
30p
17 24p
16 30i
15
1280
×
720
60p
14 30p
13 24p
12
S
D
T
V
704
×
480
60p
11 30p
10 24p
9 30i
8
4:3
60p
7 30p
6 24p
5 30i
4
640
×
480
60p
3 30p
2 24p
1 30i
Video / Audio Switcher, Scaling and Enhancing
PHD-8VX is a Media Center Box, which acts like
video/audio switcher. PHD-8VX can accept many
different individual A/V inputs including component
(Y-Pb-Pr), RGB, HDMI, composite, s-video and USB
input for playing Photo and music files. With pressing
“INPUT” button on remote control, PHD-8VX can
quickly switch to any one input as desired.
PHD-8VX can scale all video resolutions up to 1080p
from HDMI output. It equips superior color
management system provides a great viewing
experience using edge and color enhancements.
