GRASS VALLEY 1200, Установка и обслуживание

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3-7
System Overview
Control Signals
The control signals begin in the control panel. The pushbuttons and
potentiometers of the control panel are scanned and any change in the
status of the controls is noted by the panel controller. If the signal is an
analog one (i.e. potentiometers), it is digitized and sent along with the
digital signals (i.e. pushbuttons), to the Control Processor Module in the
signal processor frame.
The Control Processor Module interprets these signals and sends each of
the modules in the signal processing frame the correct signal to do the
requested operation. Information which is programmed in the system (e.g.
which input is assigned to which pushbutton) is stored on the Control
Processor Module and is called upon to interpret the information from the
control panel.
Each module and submodule tells the CPU that it is installed and what
version number it is. The CPU writes control values only to modules that
are installed.
Timing Signals
In the Model 1200, all timing signals are generated in the Sync Pulse
Generator Submodule. This submodule plugs into the Control Processor
Module. The timing signals are sent to the Control Processor Module
where they go through fanout and distribution to the various video
modules. Each video module uses them to generate the clocks needed by
that module. All video signals are reclocked periodically to avoid video
jitter.
Processing Amplifiers
Every video output bus has a Proc Amp (processing amplifier). These can
be used for adjusting the gain, offset, and hue of the video. The settings of
the Proc Amps are determined by the settings associated with the
particular input being used on that bus. If a new input is selected for that
bus, the settings for that Proc Amp automatically change to the settings
associated with the new input. Proc amp settings are stored on the Control
Processor Module.