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[[resources/tools-software/sigmastudiov2/modules/filters|Click here to return to the Filters page]]
====== General Eq Blend ======
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{{:resources:tools-software:sigmastudiov2:modules:filters:generaleqblend.png?250}}

{{:resources:tools-software:sigmastudiov2:modules:filters:generaleqextblend.png?220}}
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{{:resources:tools-software:sigmastudiov2:modules:filters:genfiltsettings.png}}
===== Description =====
The General (2nd-Order) block gives access to a wide variety of 2nd-order (biquad)filter algorithms along with equalization. Blend factor and slew rate modifications are allowed on the module for each stage.

The available filter types are:
   * Unordered List ItemOrdered List ItemParametric
   * Shelving
   * General High-Pass
   * General Low-Pass
   * General Band-Pass
   * General Band-Stop
   * Butterworth Low-Pass / High-Pass
   * Bessel Low-Pass / High-Pass
   * Tone Control
   * IIR Coefficient (direct coefficient entry)
   * 1st-Order Low-Pass / High-Pass
   * All-pass
   * Peaking
   * Notch
   * Chebyshev Low-Pass / High-Pass
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===== Usage =====
To open the filter control window, click on the icon button. Select the desired filter type from the drop-down combo-box list. The filter controls and the icon button image will change to reflect the selected filter type.
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===== Variants =====
General Equalizer module with External blend factor(General Eq Ext Blend). The number of Blend pins varies with the number of stages opted for.
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===== Targets Supported =====
^ Name            ^ ADSP-214xx ^ ADSP-215xx/SC5xx ^ ADAU145x/146x ^
| -------------------------------------- | -------------------- | -------------------------------- | ---------------------------- |
|GeneralEqBlend|B/S|B/S|S|
|GeneralEqBlendExt|B/S|B/S|S|
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===== Pins =====
==== Input ====
^Name^Type^Description^
| --------------------------------------------- | ------------------------------ | ------------------------------------------------ |
|Input0|Audio|Input Channel 0|
|Blend0|Control|External Blend pin for GeneralEqExtBlend variant|

==== Output ====
^Name^Type^Description^
| --------------------------------------------- | ------------------------------ | ------------------------------------------------ |
|Output0|Audio|Output channel 0|
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===== Configurable Parameters =====
^GUI Parameter Name^Default Value^Range^Function Description^
|----------------------------------------------------------|---------------------------|---------------------------------------------|----------------------------------------------------------|
|Stage<fc #ff0000>X</fc>_Filter<fc #ff0000>Y</fc>_Boost|0 dB| -10 to +10 dB|Set the boost value for a particular filter curve|
|Stage<fc #ff0000>X</fc>_Filter<fc #ff0000>Y</fc>_Frequency|1000|0 to 96000Hz|Cut-off frequency|
|Stage<fc #ff0000>X</fc>_Filter<fc #ff0000>Y</fc>_Gain|0 dB|-15 to +15 dB|Filter Gain|
|Stage<fc #ff0000>X</fc>_Filter<fc #ff0000>Y</fc>_Q|1.41|0.1 to 16|Q factor of the filter|
|Stage<fc #ff0000>X</fc>_Filter<fc #ff0000>Y</fc>_Slope|1|0 to 2|Slope controls filter steepness and therefore the transition between the boost/cut and the flat response.|
|Stage<fc #ff0000>X</fc>_Filter<fc #ff0000>Y</fc>_FilterType|Parametric filter|Available filter Types|Controls the type of the filter|
|Stage<fc #ff0000>X</fc>_Filter<fc #ff0000>Y</fc>_EnabledOrBypassed|True|True/False|Enabled/Disabled the algorithm|
|Stage<fc #ff0000>X</fc>_Filter<fc #ff0000>Y</fc>_Phase|False|True/False|Controls the phase of coefficients in 0 degree or 180 degree phase| 
|Stage<fc #ff0000>X</fc>_Slew |0|0 to 1|Slew value for individual filter stages|
|Stage<fc #ff0000>X</fc>_Blend |0|0 to 1|Blend value for individual filter stage|
|NumStages|1|1 to 20 | Number of stages of filter. Change in this value requires re-compilation|
|NumChannels|1| 1 to 20|Number of input and output channels. Change in this value requires re-compilation|
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Here, * <fc #ff0000> X</fc> - Indicates Stage Number
* <fc #ff0000> Y</fc> - Indicates Filter A/Filter B
===== DSP Parameters =====
^ Parameter Name       ^ Description ^ ADSP-214xx/SC5xx/215xx ^ ADAU145x/146x ^
| ------------------------------------ | ---------------------------------------------------------- | ---------------------------------------- | ---------------------------- |
|Stage<fc #ff0000>X</fc>_Filter<fc #ff0000>Y</fc>_B0|B0 Filter Coefficient|Float|FixPoint8d24|
|Stage<fc #ff0000>X</fc>_Filter<fc #ff0000>Y</fc>_B1|B1 Filter Coefficient|Float|FixPoint8d24|
|Stage<fc #ff0000>X</fc>_Filter<fc #ff0000>Y</fc>_B2|B2 Filter Coefficient|Float|FixPoint8d24|
|Stage<fc #ff0000>X</fc>_Filter<fc #ff0000>Y</fc>_A1|A1 Filter Coefficient|Float|FixPoint8d24|
|Stage<fc #ff0000>X</fc>_Filter<fc #ff0000>Y</fc>_A2|A2 Filter Coefficient|Float|FixPoint8d24|
|Stage<fc #ff0000>X</fc>_Slew_Lambda|Exponential decay value of filter stage X|Float|FixPoint8d24|

\\ Here, 
     * <fc #ff0000> X</fc> - Stage Number (Changes for each stage coefficients)
     * <fc #ff0000> Y</fc> - Filter A/B for each stage X    
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