Specifications

Chapter 2: Aural Exciter Controls 9
Through the many steps of recording, duplicat-
ing, distributing, and reproducing sound, the
phase of the low frequency audio spectrum be-
comes delayed compared to mid and high fre-
quencies. SPR corrects the bass delay anomaly to
restore clarity and openness and significantly
increases the apparent bass energy level without
adding any amplitude equalization or bass
boost.
To audition the effect of SPR on the audio sig-
nal, turn the Ax switch Off and turn SPR On.
Then alternately turn the Bypass switch On and
Off to hear the SPR effect on incoming audio.
The SPR function is depicted in Figure 6, which
shows the frequency dependent time delay that
is produced. Note that this is not the same as a
group delay. Group delay is a constant time de-
lay at all frequencies.
Bypass Switch
The Bypass switch allows the main audio signal
to bypass the Aural Exciter plug-in completely.
The indicator switch illuminates when Bypass is
engaged.
The Bypass switch on the plug-in provides the
same function as the Bypass command on the
Pro Tools Plug-Ins window, on a per-channel
basis.
Link Switch
The Link switch is for stereo operation only. It
links the left and right controls so they work as
one. Grab the control on one page with the cur-
sor and move it to the required position. The
control on the other page automatically up-
dates. In this way both controls can be set to the
exact same position. Stereo controls may be
linked temporarily by holding down the Shift
key while adjusting the control.
The switch illuminates when Link is activated.
LR (Left/Right) Switches
The LR switch is for stereo operation only. It al-
lows you to view or change parameters on one
channel at a time.
The switch for the currently displayed channel
illuminates. Choosing the unlit switch, changes
the display to the other channel.
To edit both channels simultaneously, click on
the Link switch.
Figure 6. SPR switch
SPECTRAL PHASE REFRACTOR
PHASE (Degrees)
TIME DELAY (Milliseconds)
AUDIO FREQUENCY (Hz)
PSYCHOACOUSTIC PHASE
400
350
300
250
200
150
100
50
0
-50
10 100 1000 10000
12
0
2
4
6
8
10
LEADING PSYCHOACOUSTIC PHASE RESPONSE
ACTUAL TIME DELAY