Specifications

Digidesign Plug-Ins Guide64
to follow the noise signature as closely as possi-
ble will also help maximize noise reduction and
minimize signal loss. See “Editing the Contour
Line” on page 69.
Noise Reduction Amount Controls how much
the noise signal is reduced. It is calibrated in
decibels. A setting of 0 dB specifies no noise re-
duction. Increasing negative amounts specify
more noise reduction. The default value is 0 dB.
In many cases, as much as 20–30 dB of noise re-
duction can be used to good effect. However, be-
cause higher amounts of noise reduction can
generate unwanted audio artifacts, you may
want to avoid setting the NR Amount slider to
its maximum value.
Response Adjusts how quickly the downward
expanders and noise reduction process responds
to the overall changes in the noise in millisec-
onds. Depending on the character of the noise,
different settings of this control will produce
varying amounts of artifacts in the signal, as the
modeling process attempts to track the noise
signal faster or slower.
The Response speed ranges from 0 ms to 116 ms.
A setting of 116 ms (slow) specifies that the
modeling process should not attempt to track
very fast changes in the noise character. A set-
ting of 0 ms (fast) specifies that the modeling
process should attempt to follow every change
in the noise character very closely.
A faster setting can yield more noise removal,
but it may generate more artifacts. This is simi-
lar to how a noise gate produces chatter when
attempting to track highly dynamic material. A
slower setting will allow slightly less noise re-
moval, but will generate much fewer artifacts.
Release Use in conjunction with the Response
slider. It controls how quickly DINR reduces the
amount of noise reduction when the amount of
noise present in the audio diminishes. Release
times range from 0 ms to 116 ms. Like the Re-
sponse control, a faster setting can yield more
noise removal, but it may also generate artifacts.
You may want to avoid setting this control to its
slowest position, since it will cause the noise
tracking to slow to the point that the other pa-
rameters seem to have no effect.
Smoothing Controls the rate at which noise re-
duction occurs once the threshold is crossed. It
allows you to reduce the audibility of any arti-
facts generated in the modeling process, at the
expense of noise reduction accuracy. This is
done by limiting the rate of change of the Re-
sponse and Release controls to the specified
Smoothing setting. As soon as the frequency
threshold is reached, the full NR amount value
is immediately applied according to Response
and Release settings. When the frequency
threshold is reached, DINR will ramp to the NR
Amount level. Settings range from 0 to 100%. A
setting of 0% specifies no smoothing. A setting
of 100% specifies maximum smoothing.
High-Shelf EQ
The High-Shelf EQ (Hi Shelf) is a noiseless filter
that can be applied after noise reduction has
been performed in order to compensate for a
perceived loss of high frequency content. It is
NR Amount, Response, Release, and Smoothing