High-Pass Filter
The High-Pass filter amplifies frequencies above a set frequency, and attenuates the frequencies below that set frequency. You can control the slope at which the gain rises from the attenuated frequencies to the set Gain of the passed (or amplified) frequencies.
Properties
Slope
|
Property |
Function |
Choices |
|---|---|---|
|
Max Slope |
Sets the maximum Slope allowable in the Control Panel for all of the filters. |
Default = 24 12, 24, 36, 48, 60, 72, 84, 96 dB/Octave |
Channels
|
Property |
Function |
Choices |
|---|---|---|
|
Type |
Sets the type of input and output channels |
Mono Stereo Multi-Channel |
|
Count |
For Multi-Channel, sets the number of channels. |
2 to 256 |
Response Panel
|
Property |
Function |
Choices |
|---|---|---|
|
Enabled |
Determines if the Response Panel is visible in the Control Panel |
Yes / No |
|
Size |
Determines the size of the Response Panel. |
Small Medium Large |
Controls
|
Control |
Function |
Default / Range |
|---|---|---|
|
Response Panel |
The Response panel provides vertical and horizontal cross-hairs with a dynamic frequency and dB read-out. Place the mouse courser over the graph to activate the cross-hairs. When the Phase control is activated, the horizontal cross-hair line to the left of center represents the normal curve, the right side represents the phase curve. The readout is only for the normal curve. |
X-Axis = Freq, 20 Hz to 20 kHz Y-Axis Left = dB, -24 dB to 24 dB Y Axis Right = Phase, -180° to -180° |
|
Phase |
Turns the Phase curve on and off. |
On / Off |
|
Bypass |
Bypasses the filter. |
Off / On |
|
Invert |
Inverts the output signal. |
Normal/Inverted |
|
Mute |
Mutes the output signal. |
Off / On |
|
Frequency (Hz) |
Sets the frequency at which the gain of the output reaches a point 3 dB below the maximum as set by the Gain control. Frequencies below this frequency are attenuated. All frequencies above this frequency are amplified based on the setting of the Gain control. |
Default = 10 Range = 20 to 20000 |
|
Q-factor |
The Q-factor determines the sharpness of the gain slope as it rises to meet the cutoff frequency. A Q of 1.00 causes a constant slope directly to the maximum Gain at the cutoff frequency, a slight rise above the maximum Gain, then gradually falls back to the maximum Gain as frequency increases. The result is an even rise in gain to the cutoff frequency, and a fairly flat amplification of the frequencies from the cutoff frequency and higher. A Q of 10 causes a sharp spike of 20 dB higher than the maximum Gain at the cutoff frequency, then a sharp decline to the maximum gain as the frequency increases. The result is the frequencies in a fairly narrow band around the cutoff frequency are amplified above the maximum Gain. A Q of 0.100 causes a very slow, curved slope beginning right at the cutoff frequency up to the maximum Gain. The result is that the frequencies below the cutoff frequency are completely attenuated and the Gain above the cutoff frequency is slowly increased as frequency increases. |
Default = 1.00 Range = .100 to 10.00 |
|
Gain (dB) |
Sets the output Gain. |
Default = 0 Range = -100 to 20 |
|
Slope (dB per Octave) |
Sets the slope at which the gain rises from -100 dB to the level set by the Gain control. You can set the maximum allowed slope in the Properties. The Linkwitz-Riley adjusts in 12 dB per Octave steps, all others adjust in 6 dB per Octave steps. |
Variable Q Default = .707 Range = .100 to 10 Default for all others = 24 Range: Butterworth = 6 to 96 Linkwitz-Riley = 12 to 96 Bessel-Thomson = 6 to 96 Chebyshev = 6 to 96 |
|
Type |
Selects the type of filter. |
Butterworth Linkwitz-Riley (Default) Bessel-Thomson Chebyshev |
|
Bessel Normalization |
Sets the type of normalization for the Bessel-Thomson filter. |
-3 dB Flat Group Delay -3 dB Mirror Magnitude Natural Mirror Magnitude Natural Phase Match |
Control Pins
|
Pin Name |
Value |
String |
Position |
Pins Available |
|---|---|---|---|---|
|
Bypass |
0 1 |
active bypass |
0 1 |
Input / Output |
|
Filter Type |
1.00 2.00 3.00 4.00 5.00 |
Variable Q Butterworth Linkwitz-Riley Bessel-Thomson Chebyshev |
0 .25 .50 .75 1.0 |
Input / Output |
|
Frequency |
10.0 to 20,000 |
10 Hz to 20 kHz |
0.000 to 1.00 |
Input / Output |
|
Gain |
-100 to 20 |
-100 dB to 20 dB |
0.000 to 1.00 |
Input / Output |
|
High-Pass (Bessel-Thomson) Normalization |
0 1 2 3 |
-3 dB Flat Group Delay -3 dB Mirror Magnitude Natural Mirror Magnitude Natural Phase Match |
0 .333 .667 1.00 |
Input / Output |
|
Invert |
0 1 |
normal invert |
0 1 |
Input / Output |
|
Mute |
0 1 |
unmute mute |
0 1 |
Input / Output |
|
Q |
.100 to 10.0 |
.100 to 10.0 |
0.000 to 1.00 |
Input/Output |
|
Slope |
6.0 12.0 18.0 24.0 30.0 36.0 42.0 48.00 54.0 60.0 66.0 72.0 78.0 84.0 90.0 96.0 |
6 dB/Oct 12 dB/Oct 18 dB/Oct 24 dB/Oct 30 dB/Oct 36 dB/Oct 42 dB/Oct 48 dB/Oct 54 dB/Oct 60 dB/Oct 66 dB/Oct 72 dB/Oct 78 dB/Oct 84 dB/Oct 90 dB/Oct 96 dB/Oct |
0.00 .067 .133 .200 .267 .333 .400 .467 .533 .600 .667 .733 .800 .867 .933 1.00 |
Input / Output |
