Lumagen Radiance 2020 - Manual (Page 10)

Section 2 – Overview
Radiance 2020 rev 102214 5
Block Diagram
The function of the Radiance is to act as a video switch, process the selected video source and then output
video in the appropriate format and resolution. Standard definition (SD), enhanced-definition (ED), and
high-definition (HD) video inputs, are supported. Video inputs are converted to progressive video (if
necessary) and are then scaled to the video output resolution.
Interlaced video has been in use for more than 50 years and is still the most common video format. It
displays half of the lines of picture information each sixtieth (or fiftieth) of a second. Each half of the image
is called a field and displays either all the even lines, or all the odd lines. So, an entire image, called a
frame, takes a thirtieth (or twenty-fifth) of a second to display on the screen. An “i” suffix on the resolution
specification is used to indicate interlaced formats.
In contrast, progressive video presents each frame as a whole. A “p” suffix on the resolution specification is
used to indicate progressive formats. Converting interlaced video to progressive video is referred to as
“deinterlacing.”
The Radiance is comprised the following major functional sections:
• Video/Audio input selection
• Video deinterlacing (if required)
• Video processing and scaling
• Video/Audio output
The functional blocks are shown below.
If the video input is interlaced, it is first deinterlaced into a progressive format. User enabled noise reduction
algorithms are then applied. Proprietary No-Ring™ scaling algorithms are used to scale the resulting
progressive video to the optimal size for the display.
As part of the scaling process, digital filtering is used to enhance the image detail. This enhancement allows
standard definition inputs, such as DVDs, to appear to be much higher resolution. This is especially valuable
when standard-definition sources are viewed on the large screen sizes common in home theaters.
Commands can be sent to the Radiance by infrared remote or via the serial RS232 port. The RS232 port is
used for software updates. Setup is done with the on-screen menu. User functions (e.g. select input) use
direct commands.