Digital Audio Corporation PCAP II, User Manual

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Time options are 0.125 seconds (fastest), 0.250 seconds, 0.500
seconds, and 1.0 seconds (slowest).
The 0.250 seconds setting is
recommended for voice applications . Release Time settings longer
than 0.250 seconds may result in excessively long periods of reduced
signal level after an overload occurs.
Figure 4-5 Limiter Setup Window
Threshold specifies the input bargraph level which is considered to be
an overload condition; any time an input signal exceeds this level,
the gain will be decreased for that input until it no longer exceeds the
Threshold. The Threshold options are -6dB (highest), -9dB, -12dB,
and -15dB (lowest).
The -9dB setting is recommended for most
applications . In general, Threshold settings lower than -9dB will
provide better overload protection, but with significant sacrifice in peak
signal level (dynamic range).
The Link option is provided in Stereo configurations to give the user
the option of making the input channels Linked or Independent (In
Mono configuration, the extra inputs are used only with the Reference
Canceller, and are always Linked). When Linked, the Limiter gains
are equal at all times for all channels, and are reduced in response to
an overload on any input channel. When Independent, the Limiter
gains are not necessarily equal, each reduced in response to only its
own input channel. For stereo or multiple microphone applications,
the Limiter inputs should be Linked to avoid annoying Left/Right
differential gain shifts; however, Independent Limiter gains should be
used when processing two unrelated monophonic signals in a Stereo
configuration.