Studio Technologies 5150 V.3 - Manual (Page 16)

Issue 1, June 2013 Model 5150 User Guide
Page 16 Studio Technologies, Inc.
Model 5150
Video Generator Module
combination is that it must be a compatible
combination. Refer to the Specifications
section of this guide for a complete list.
There are some applications that will bene-
fit from the internally-generated SDI output
signal always having a specific format and
rate. In this case the SDI output image
format/rate mode can be set for Locked.
No matter what the format and rate of a
connected SDI signal, the stored param-
eters will not change. Changing the stored
parameters would require the format/rate
mode to be changed to Auto Select, an
SDI signal with the desired format and
rate be connected for a minimum of five
seconds, and then the format/rate mode
changed back to Locked.
Moving Image Overlay
The Model 5150 has the ability to overlay
a moving image on top of the stored “720”
and “1080” images. A configuration setting
selects whether the moving image overlay
will be active. The moving image, a box
that’s red in color, slowly moves around
and on top of whatever stored image is
present on the SDI output. The color, size,
and rate of motion of the “box” are fixed in
the FPGA’s firmware (embedded software)
and can’t be altered.
The moving image is provided specifically
so that users who are “downstream” from
the Model 5150’s SDI output are assured
that the “720” or “1080” image they are
viewing is active. And, just to clarify, if
a signal is present on the Model 5150’s
selected SDI input it will be passed on to
the coaxial (BNC) and, if present, optical
SDI outputs. The moving image will never
overlay an input signal—it can only overlay
on top of the stored image.
Technical Notes
Bitmap Image File
Requirements
The Model 5150 allows two bitmap (.bmp)
images to be stored and output when an
SDI input signal is not present. One im-
age has a pixel size of 1280 x 720 while
the other has a pixel size of 1920 x 1080.
To be stored with the Model 5150 the
files must be FAT32-compatible and have
names of img720.bmp and img1080.
bmp, respectively.
The reason two files are required is simple:
the Model 5150 does not have the ability to
digitally “scale” a 1920 x 1080 image down
to 1280 x 720. But it does have the ability
to store two unique files. Most users will
create a single image using a personal-
computer graphics program and then save
it in the two required formats. So when the
Model 5150 generates either of the two
images (“720” or “1080”), a user will see
what appears to be an identical image.
But there is no reason why the two images
(“720” and “1080”) have to be based on the
same original graphics. Studio Technolo-
gies chose to create two different “720”
and “1080” bitmap files that are pre-loaded
in the Model 5150 at the time of manufac-
ture. They feature two unique background
images with text highlighting the main
requirements for updating them.
While the two bitmap files ( img720.bmp
and img1080.bmp) are “standard” in the
sense that they are FAT32-compatible and
have the extension .bmp, they must adhere
to one important requirement that not all
personal-computer graphics programs sup-
port. Their DIB (bitmap information header)
must be a BITMAPINFOHEADER type.