RFX-RMT-II SD/HD
LAST REV: DEC 2007
16
Operator’s Manual
RF ExtremeCare: 866.732.0113
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Audio Analog to Digital Converter, 48kHz, 24 bit. Four high impedance analog
inputs. The channels are first buffered by a variable gain stage to accommodate
either Mic or Line level inputs. A switchable 20dB stage is also included to
accommodate low level Mic inputs. The audio channels are then converted into
digital signals and passed to the MPEG2 Encoder.
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Audio SDI de-embedder. Extracts digital audio from the SDI stream
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MPEG2 Encoder. Compresses the video and audio. The encoder uses a suite
of MPEG2 compliant compression techniques, where the data bit rate is reduced
by processing over multiple picture frames. The absolute picture (
I
ntra frame) is
interleaved with pictures that are created using difference data (
P
redicted frame)
with
B
i-directionally predicted frames (4:2:2 Only) in conjunction with motion
compensation; thus low data rates down to 4 Mbps, can be achieved.
The encoder includes special modes which are optimized for low delay
(latency).
The encoding parameters are loaded into the encoder at power up. These are
selected from one of the ‘preset’ encoder memories. See 8.4.6 and Appendices
A and B.
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ASI routing.
As an alternative to the internal MPEG encoder, an external ASI data stream
may be used. The ASI input to the front panel is converted to parallel, and
automatically selected for 188/204/byte mode inputs. The signal is then
configured for the modulator input format and routed direct to the transport
stream output, bypassing the MPEG2 encoder.
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DC Power Supplies
Switching DC/DC converters are used to generate the various supplies from the
incoming 9-18V battery supply. These include 2.5, 3.3V, 5V, 8V and +/-5V
supplies.
There are no field replaceable parts on the Encoder board. If a fault occurs with the board
please contact RF Central for technical assistance.