Versions Compared

Key

  • This line was added.
  • This line was removed.
  • Formatting was changed.
Comment: Scroll Documents: Update page title prefix

Overview

2nd order filter with coefficients derived from input pins with high precision implementation

Discussion

This module implements a general purpose second order filter that is capable of realizing many different filter types. The module performs internal smoothing allowing the filters to be updated without introducing clicks. In all cases, the module implements an underlying second order filter. First order filters are realized by setting some of the second order coefficients to zero.

...

filterType=22, 2nd order Butterworth high pass filter with variable Q. [freq, Q].

Type Definition

Code Block
typedef struct _ModuleSOFControlHP
{
    ModuleInstanceDescriptor instance;            // Common Audio Weaver module instance structure
    INT32 filterType;                             // Selects the type of filter that is implemented by the module: Bypass=0, Gain=1, Butter1stLPF=2, Butter2ndLPF=3, Butter1stHPF=4, Butter2ndHPF=5, Allpass1st=6, Allpass2nd=7, Shelf2ndLow=8, Shelf2ndLowQ=9, Shelf2ndHigh=10, Shelf2ndHighQ=11, PeakEQ=12, Notch=13, Bandpass=14, Bessel1stLPF=15, Bessel1stHPF=16, AsymShelf1stLow=17, AsymShelf1stHigh=18, SymShelf1stLow=19, SymShelf1stHigh=20.
    FLOAT32 freq;                                 // Cutoff frequency of the filter, in Hz.
    FLOAT32 gain;                                 // Amount of boost or cut to apply, in dB if applicable.
    FLOAT32 Q;                                    // Specifies the Q of the filter, if applicable.
    FLOAT32 smoothingTime;                        // Time constant of the smoothing process.
    INT32 updateActive;                           // Specifies whether the filter coefficients are updating (=1) or fixed (=0).
    FLOAT32 smoothingCoeff;                       // Smoothing coefficient. This is computed based on the smoothingTime, sample rate, and block size of the module.
    UINT32 pinID;                                 // Specifies which control pins are available.
    FLOAT32* targetCoeffs;                        // Array of filter target coefficients. The size of the array is 5 and contains the variables for a biquad arranged as [Fb; Gaa; Gab; K; Fa].
    FLOAT32* currentCoeffs;                       // Array of filter current coefficients. The size of the array is 5 and contains the variables for a biquad arranged as [Fb; Gaa; Gab; K; Fa].
    FLOAT32* state;                               // State variables. 2 per channel.
} ModuleSOFControlHPClass;

Variables

Properties

Name

Type

Usage

isHidden

Default value

Range

Units

filterType

int

parameter

0

0

0:22

freq

float

state

0

250

9.6:0.1:23760

Hz

gain

float

state

0

0

-24:0.1:24

dB

Q

float

state

0

1

0:0.1:20

smoothingTime

float

parameter

0

10

0:1:1000

msec

updateActive

int

parameter

1

1

0:1

smoothingCoeff

float

derived

1

0.06449

Unrestricted

pinID

uint

const

1

7

Unrestricted

targetCoeffs

float*

derived

0

[5 x 1]

Unrestricted

currentCoeffs

float*

state

0

[5 x 1]

Unrestricted

state

float*

state

1

[2 x 1]

Unrestricted

Pins

Input Pins

Name: freqPin

Description: Cutoff frequency of the filter

...

Sample rate range: Unrestricted

Complex support: Real

Output Pins

Name: out

Description: audio output

Data type: float

MATLAB Usage

File Name: second_order_filter_controlHP_module.m

...