HE4000 Encoding System
Using the Front Panel
Front Panel Menu Summary
Command
Function
Options/Response Format
HE4000>Service
>SD Video>
Encoding
Used to configure the HE4000 SD video encoding parameters.
Bit Rate Mode
Sets the output compressed SD
video bit rate to either an
automatic calculation or manual
mode for optimum video
performance.
● If this set to Auto, -- this command is
query only (default).
● If this is set to Manual, the user sets
the data rate.
Bitrate
Displays the bitrate assigned to the
SD Video. Value can be changed if
Bit Rate Mode is set to Manual
mode.
● If Bit Rate Mode = Auto, this state is
read only.
● If Bit Rate Mode = Manual, the user may set the
data rate.
If chroma set to 4:2:0: 1.0 to 15.0 Mbps
if chroma set to 4:2:2: 2.5 to 50.0 Mbps
Chroma
Sets the chrominance
compression algorithm.
● 4:2:0
● 4:2:2 (optional )
● 4:2:2 ComtechTV – Support for older
ComtechTV Products (TDR600RA,
TDR600S)
Resolution
Sets horizontal resolution
720, 544, 480, 640, SIF, 704, 352
Aspect Ratio
Sets Aspect Ratio
4X3, 16X9
Latency
(Optimize)
Sets the selected optimization
mode
● Quality – optimizes the video performance
without regard for throughput delay time.
Quality mode is appropriate for action video
scenes such as sports material (default).
● Low-Buffer – compensates for undersized
decoder buffers.
● Low Delay – reduces the throughput time
required to process a signal from the encoder
input, through the compression process, and to
the decoder output. In low delay mode, the
overall delay through a HE4000 to an IRD is
180 ms ± 40 ms. In low delay mode, the
compressed audio bit rate is automatically set to
256 Kbps. Low delay mode is appropriate for
real time news interviews.
● Edit – video compression uses only one frame
(no prediction) which makes it easier to edit the
compressed bit stream. Edit requires a higher
data rate to achieve the video performance of
quality mode.
01-0951-404 Rev B
3-19
