X75HD Installation and Operation Manual 5
Chapter 1: Introduction
Preliminary—Contents are proprietary and confidential. Do not photocopy or distribute.
Audio Processing
Processing for audio includes level control, analog-to-digital and
digital-to-analog conversion, and SD-SDI and HD-SDI serial digital
signal embedding and de-embedding for interfacing any audio signal in
a professional environment. Audio is sample rate converted,
synchronized, and timed to video to correct for lip sync errors.
Embedded compressed audio signals, such as AC-3™, can be
de-embedded or embedded. Multiple channel program signals can be
processed for surround-sound applications before or after compression.
The available AFV (audio-follow-video) mode, a popular audio
input-to-output processing feature, launches when video inputs are
selected, but can easily be over-ridden if required.
All audio can be converted, adjusted, timed, de-multiplexed, and
multiplexed, as required.
Signal Control and Monitoring
Embedded metadata in the program stream (for example, closed
captioning) is passed transparently from input to output. Control and
monitoring of signals passing through the X75HD is enabled using IP
over Ethernet. Instant operator control from the local or remote control
panels allow for easy manipulation over video and audio signals. PC
control and monitoring over large networks is entirely manageable by
using two Ethernet ports per unit.
Operating Modes
There are two main operational modes: M-Path (multiple path)
processing, and Simulcast processing.
• M-Path operation involves processing any analog, digital, and
HDTV inputs to any analog, digital and HDTV outputs, providing
multi-channel processing, and allowing the wrapping around of an
SDTV transport device (for example, a VTR). Also provided are up
to 16-channels (8 AES) of audio processing.
• Simulcast operation allows the selection of any two inputs for clean
and simultaneous switching between selected outputs (for example,
SDTV and HDTV).
See “Overview of Operating Modes” on page 10 for more information
on modes of operation.
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