Huron & SNAP Documentation

Audio Input Levels
Managing Audio Signal Levels for
Optimum Noise Performance
Optimal noise performance can be achieved when using a
Huron System by ensuring that both analogue and digital
signals are kept as close as possible to full scale throughout
each stage of processing.
Analogue audio input to the system is converted to digital data
by the A/D module. This module contains analogue circuitry
that allows for a variety of different input types (balanced and
unbalanced) and different signal levels (microphone, consumer
line level and professional line level). A simplified schematic
of the A/D input is shown below.
Figure 106 — A/D input schematic
The volume control settings on the A/D modules are
manipulated by the lower row of sliders in the I/O Manager.
The pre-amplifier settings are selected by the buttons (labelled
0dB, 20dB, 40dB and 60dB) in the I/O Manager.
The following recommendations apply to the use of the A/D
modules:
• Always supply the highest level analogue input possible to
the A/D module (but not exceeding 20V p-p). This will
ensure that the signal level is maintained at its maximum at
all stages of the analogue input circuit, thus reducing the
contribution of noise effects.
HURON TECHNICAL MANUAL PAGE 301