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INTRODUCTION-
This portion of the introduction provides some of the technical details of the DSP-4.
Input Stage-
Inputs are electronically balanced and RF filtered. The input sensitivity is software-selectable and any large
signals are prevented from destroying the A-to-D by a diode.
Output Stage-
The output is buffered and then filtered to remove high-frequency sampling artifacts. Output sensitivity is
software-selectable and available from both sets of outputs simultaneously.
Data Acquisition-
data is used for amplifier output power limiting. Amplifier clip and protect-mode status data is also sampled. Power, protect/
clip indication, and output power limiting is not possible on non-DataPort amplifiers or "V2" DataPort amplifiers.
Contact Closure Trigger Input-
such as "Switched Gain". It's TTL compatible: pulling this pin to ground through a maximum impedance of 1.3k ohms forces a
general I/O pin of the DSP to a logic-low condition. The Signal Manager software can use this "event" to change gain
settings or Preset mode. Refer to the Signal Manager software Help file for available applications of the Contact Closure
Trigger Input.
Power Supply-
using an older amplifier or an amplifier that does not have a DataPort, an external power jack is provided on the DSP module.
If external power is required, use QSC's DPX-1 accessory power supply.
8
Block Diagram and Details
The data acquisition A-to-D samples the output voltage and current of both amplifier channels. This
Pin 9 of the RS-232 can be used as a trigger input for operating software "objects",
The DSP module is normally provided power through its DataPort connection from the amplifier. If you are
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