daisysp::NlFilt¶

#include <nlfilt.h>

Public Functions¶

	Name
void	Init()
void	ProcessBlock(float * in, float * out, size_t size)
void	SetCoefficients(float a, float b, float d, float C, float L)
void	SetA(float a)
void	SetB(float b)
void	SetD(float d)
void	SetC(float C)
void	SetL(float L)

class daisysp::NlFilt;

Todo: make this work on a single sample instead of just on blocks at a time.

Non-linear filter

port by: Stephen Hensley, December 2019

The four 5-coefficients: a, b, d, C, and L are used to configure different filter types.

Structure for Dobson/Fitch nonlinear filter

Revised Formula from Risto Holopainen 12 Mar 2004

Y{n} =tanh(a Y{n-1} + b Y{n-2} + d Y^2{n-L} + X{n} - C)

Though traditional filter types can be made, the effect will always respond differently to different input.

This Source is a heavily modified version of the original source from Csound.

void Init()

Initializes the NlFilt object.

void ProcessBlock(
    float * in,
    float * out,
    size_t size
)

Process the array pointed to by *in and updates the output to *out; This works on a block of audio at once, the size of which is set with the size.

inline void SetCoefficients(
    float a,
    float b,
    float d,
    float C,
    float L
)

inputs these are the five coefficients for the filter.

inline void SetA(
    float a
)

Set Coefficient a

inline void SetB(
    float b
)

Set Coefficient b

inline void SetD(
    float d
)

Set Coefficient d

inline void SetC(
    float C
)

Set Coefficient C

inline void SetL(
    float L
)

Set Coefficient L

Updated on 2024-01-03 at 19:38:46 +0000