Specifications

Audio Plug-Ins Guide338
Response
This slider 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 at-
tempting to track highly dynamic material. A
slower setting will allow slightly less noise re-
moval, but will generate much fewer artifacts.
Release
This slider is used in conjunction with the Re-
sponse slider. It controls how quickly DINR re-
duces the amount of noise reduction when the
amount of noise present in the audio dimin-
ishes. Release times range from 0 ms to 116 ms.
Like the Response control, a faster setting can
yield more noise removal, but it may also gener-
ate 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 controls seem to have no effect.
Smoothing
This slider controls the rate at which noise re-
duction occurs once the threshold is crossed. It
lets you reduce the audibility of any artifacts
generated in the modeling process, at the ex-
pense of noise reduction accuracy. This is done
by limiting the rate of change of the Response
and Release controls to the specified Smoothing
setting. As soon as the frequency threshold is
reached, the full NR amount value is immedi-
ately 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
unique because it operates only on the signal,
not on any remaining noise. The Freq slider con-
trols the center frequency of the filter. Values
range from 20 Hz to 22 kHz.
The Gain slider controls the gain of the filter.
Values range from –12 dB to +6 dB. The High-
Shelf EQ can be enabled and disabled by clicking
the Enable button.
You can also use the High-Shelf EQ to reduce the
amount of high frequencies in a signal. This is
particularly useful if you are working with older
recordings that are band-limited, since the
high-frequency content in these is probably
made up of noise and not signal.
High-Shelf EQ