Specifications

Aphex Aural Exciter Plug-In Guide 6
Tune Control
The Tune control sets the bandwidth (corner
frequency) of the second order high-pass filter
in the side-chain prior to the harmonics genera-
tor. The range of the control extends from
700 Hz to 7 kHz.
Figure 3 demonstrates the range of the Tune
control from 700 Hz to 7 kHz with Null Fill set
near Min and Peaking set at the mid-point posi-
tion. As you read the following sections on Peak-
ing and Null Fill, notice the interaction these
controls have on Tune, as well as on each other.
Peaking Control
The Peaking control provides a damping effect
on the leading frequency edge of the high-pass
filter controlled by Tune. As you vary this con-
trol from Min to Max, the Tune frequency be-
comes more accentuated, as demonstrated in
Figure 4. However, at the same time, a dip is cre-
ated just before the accentuated Tune fre-
quency. This dip or null becomes larger as Peak-
ing is increased.
Underneath the control, the amount of Peaking
is displayed as a percentage.
Null Fill Control
The Null Fill control adjusts the curve of the
high-pass filter to “fill in” the null caused by the
summing of the side-chain return signal and the
input signal.
Underneath the control, the amount of Null Fill
is displayed as a percentage.
This control compensates for “phase pulling,”
which occurs as a side effect of the time delay
present in the side-chain signal, an important
part of the Aural Exciter operating theory. As the
time delay “stretches” transient waveforms to
create a perception of louder sound, a “dip” or
“null” also occurs in the output equalization
curve at the Tune frequency. As a result, the
“null” frequencies are de-emphasized, thus giv-
ing even more emphasis to the higher frequen-
cies. Although this often is a desirable effect, the
Null Fill control was created to allow the user to
fill-in the null by a selectable amount for any
applications requiring less emphasis.
Figure 5 shows three different Null Fill settings
with Tune set at the mid-point position. With
the Null Fill control set at Min, there is a notice-
able drop in the frequency response, just before
the start of the high-pass shelf boost. At this set-
ting, program material under enhancement
Figure 3. Tune control
TYPE III TUNING RANGE
RESPONSE (dB)
FREQUENCY (Hz)
7.0
5.0
3.0
1.0
-1.0
20.0 100.0 1000.0 10000.0
TUNE at 700 Hz
TUNE at 7 kHz
NULL FILL at Minimum
PEAKING at midpoint
for all curves
TUNE at 3 kHz
(midpoint)
Figure 4. Peaking control
TYPE III PEAKING RESPONSE
RESPONSE (dB)
FREQUENCY (Hz)
10.0
6.0
2.0
-2.0
-6.0
20.0 100.0 1000.0 10000.0
PEAKING at MAX
NULL FILL at MIN
TUNE at midpoint
for all curves
PEAKING at MIN
PEAKING
at MIDPOINT