Introduction
Instruction Manual: evolution 5000 E5500 Mobile Contribution Encoder
Page 1-9
ST.TM.E10033.3
Video Variable Bit-rate
The MPEG-2 compression algorithm uses adaptive field/frame coding,
forward and backward predictive processing with motion estimation and
compensation to reduce the bit-rate to the range 1.5 to 15 Mbit/s.
NOTE…
If the 4:2:2 upgrade has been purchased, video bit-rates of up to 50 Mbit/s are available on the ASI
output. The actual modulated output depends on the symbol rate (which has a maximum of 30
Msymbols/s).
Coding Resolutions
To provide optimum picture quality over the full bit-rate range, the
encoded picture resolution is controlled automatically according to the
video bit-rate. Alternatively, the user can override this and select manual
control, if desired. Available coding resolutions are shown in Table 1.2.
Table 1.2: Video Coding Resolutions and Typical Bit-rates
625 Line Modes
525 Line Modes
Typical Bit-rate
4:2:0 (Mbit/s)
Typical Bit-rate 4:2:2 (Mbit/s)
720 pixels x 576 lines
720 pixels x 480 lines
4.0 – 8.0
up to 50.
704 pixels x 576 lines
704 pixels x 480 lines
4.0 – 8.0
up to 50.
544 pixels x 576 lines
544 pixels x 480 lines
2.5 – 6.0
-
480 pixels x 576 lines
480 pixels x 480 lines
2.0 – 6.0
-
352 pixels x 576 lines
352 pixels x 480 lines
1.5 – 4.0
-
System configuration can be stored in non-volatile random access memory
(NVRAM) for restoration of configured state at power-on.
Internal Frame Synchroniser
An internal frame synchroniser is incorporated to maintain a valid encoded
bit-stream in the event of discrepancies between the relative timing of the
input video syncs and the internal flywheel syncs.
Output on Video Loss
The MCE can be software-configured to show, in the event of video input
loss, either:
•
Test pattern
•
Freeze frame
•
Cut to a black screen.
1.3.2
Audio Encoding
General
Audio can be encoded to either:
•
MPEG-1 Audio (layer 2) standard (sampling rate 32 kHz or 48 kHz).
•
Dolby Digital (sampling rate 32 kHz, 44.1 kHz or 48 kHz).
Output bit-rate is selectable in the range 32-384 kbit/s (dependent on
configuration) for MPEG-1 Audio (layer 2) and 56-640 kbit/s
(dependent on configuration) for Dolby Digital.
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