Clear-Com HX System Frames - Manual (Page 227)

Figure 8-5 Audio Level Compression
Limiter
This sets the maximum audio level on the input that is passed to further stages of the
audio mixer. The limiter settings are:
• Off
• -6dB
• -8db
Threshold
The threshold setting determines the level at which audio compression starts. When the
audio input level passes the threshold it begins to be compressed so that the output level
from the compressor approaches the audio limit more slowly as the audio input level rises.
The threshold settings are:
• Off
• -10dB
• -20dB
Compressor
The audio compressor reduces the audio level by compressing it whenever the audio level
exceeds the threshold. This has the effect of allowing the audio level to rise but reducing it
by a fixed ratio. The compressor settings are:
• Off
• Compression 5:1
• Compression 3:1
For example, if the compressor is set to 5:1 with a threshold of -10dB this has the effect
that for every 5dB increase in the input level above the threshold of -10dB the compressor
outputs only 1dB of increase. Thus if the input audio is 20dB above the threshold the
output from the compressor only shows an increase of 4dB. If the limiter was set to +6dB
then a 20dB increase would normally exceed the limiter (-10dB + 20dB = 10dB) so the
audio level would be cut off at +6dB. With the compressor the audio level would not reach
the limit so the audio would still rise to mimic the input (-10dB + 4dB = -6dB).
227 Eclipse EHX Software User Guide