Antares MDT user manual

MDT UserÕs Manual61
Release Slider
The Release slider adjusts the time it takes for MDT to return to its quies-
cent state after a peak comes through. The range of the control is from 0 mil-
liseconds to 5,000 milliseconds. The current release time is displayed in the
window to the left of the slider. 
Clicking on the arrows changes the release time in small increments. Press-
ing on the arrows decrements/increments the release time continuously.
Pressing  before clicking or pressing on the arrows...

MDT Reference
62MDT UserÕs Manual
The settings are now saved. These settings appear at the bottom of the 
Setting menu.
To recall a setting;
1. Choose it from the Setting menu.
The settings are recalled as you saved them.
To delete the setting;
1. Choose Delete SettingsÉ from the Setting menu.
A dialog appears with the list of the settings in the menu.
2. Scroll down to Test and select it by clicking on it.
3. Click on the Delete button.
The setting is deleted from the menu. You may select multiple...

MDT UserÕs Manual63
Thresholds And Terminators
Up to 30 thresholds can be placed on the In/Out Grid to Òrubber bandÓ the
I/O Curve. The rules for using thresholds are as follows.
To: Do This:
place a threshold on the curve,  click in the In/Out Grid. 
display the location of a threshold click on the threshold
move an existing threshold, click and drag it to the new location. 
delete a threshold,  press  and click on the threshold.
The lower terminator is ÒgluedÓ to the In axis. It will always have an...

MDT Reference
64MDT UserÕs Manual
Setting this button causes the input offset levels to be continuously adjusted
so the band levels are, on the average, even with one-another. This causes
the output sound to have no coloration. The speed of these adjustments is
three times slower than the compressor release time. Hence, no matter what
the release time setting is, using the ÒVariableÓ button will not interfere
with the bands compressing independently from one-another. Once the
ÒVariableÓ button is set,...

MDT UserÕs Manual65
CHAPTER 5Theory of Operation
MDT has been designed to provide enormous power and ßexibility through
the use of a simple user interface. However, since MDT is a new technology,
some users may Þnd it interesting or helpful to have a deeper
understanding of the conceptual elements of MDTs actual processing
algorithms. 
This chapter has been written to satisfy that need. The concepts behind
MDTs processing algorithms are presented here in sufÞcient detail so that
the behavior of MDT is...

MDT UserÕs Manual66 The Gain Adjust Algorithm
and computing and applying the Þnal gain. The details of the Gain Adjust
computation are given by the diagram:
The diagram above shows that as each sound sample is presented, a new
input level is computed. The input level is a positive valued number
between 0 (-96 dB) and 1 (0 dB). The input level is then multiplied by the
user deÞned input level offset value to give the scaled input level. This
value is presented to the user on the In/Out Grid as a...

MDT UserÕs Manual67 The Gain Adjust Algorithm
In the Gain Adjust computation, the compute level box depicts the
computation of the input level from the sound samples. The compute level
computation is depicted in the ßowchart:
This ßowchart shows that the absolute value of each sound sample is Þrst
compared with the previously computed level. If the absolute value is
greater than the previously computed level, then a decay value
corresponding to the attack time is used, otherwise a decay value...

MDT UserÕs Manual68 The ÒFull BandÓ Filter Mode
The ÒFull BandÓ Filter Mode
This is the simplest computation. In this Þlter mode, the sound data is input
to the Gain Adjust. The output of the Gain Adjust is multiplied by the Gain
slider value for the Þnal output:
The ÒStandardÓ Filter Modes
The following diagram depicts the Ò3 bandÓ and Ò5 BandÓ Þlter modes:
The input signal is Þrst split into separate bands using parametric equalizer
Þlters. Each of these Þltered signals is processed by a separate Gain...

MDT UserÕs Manual69 The ÒStandardÓ Filter Modes
The center frequencies of the parametric equalizer Þlter pass bands are 140,
1120, and 8960 Hz (3 octave spacing) for the 3 Band Þlters and 40, 160, 640,
2560, and 10240 Hz (2 octave spacing) for the 5 Band Þlters.
Consider the case where the I/O Curve is a 45 degree 1:1 diagonal. In this
case, all output levels will equal the scaled input levels and the resulting
output gains will be unity. This means the Gain Adjust output will equal the
Gain Adjust...

MDT UserÕs Manual70 The ÒAPÓ Filter Modes
The ÒAPÓ Filter Modes
In some cases, the ±0.3 dB of passband ripple in the parametric equalizer
Þlters of the standard Þlter modes are not desirable. The AP Þlter modes do
not have these artifacts provided certain limitations can be met. The
following diagram depicts the Ò3 band APÓ and Ò5 Band APÓ Þlter modes:
This diagram is the same as the standard Þlter mode diagram except for the
additional data paths show as heavier lines. Consider the following sub-...