dsp::SimpleLFO Struct Reference

Simple LFO. More...

#include <simplelfo.hpp>

Public Member Functions
	SimpleLFO (void)
	Default constructor.
void	cycle (void)
	Step phase one cycle forward.
void	reset (void)
	Reset phase.
void	setF0 (const float f0, const float fsrecip)
	Set LFO frequency. More...
void	setW0 (const float w)
	Set LFO frequency in radians. More...
float	sine_bi (void)
	Get value of bipolar sine wave for current phase.
float	sine_uni (void)
	Get value of positive unipolar sine wave for current phase.
float	sine_bi_off (const float offset)
	Get current value of bipolar sine wave for phase with offset. More...
float	sine_uni_off (const float offset)
	Get current value of positive unipolar sine wave for phase with offset. More...
float	triangle_bi (void)
	Get current value of bipolar triangle wave for current phase.
float	triangle_uni (void)
	Get value of positive unipolar triangle wave for current phase.
float	triangle_bi_off (const float offset)
	Get current value of bipolar triangle wave for phase with offset. More...
float	triangle_uni_off (const float offset)
	Get current value of positive unipolar triangle wave for phase with offset. More...
float	saw_bi (void)
	Get current value of bipolar saw wave for current phase.
float	saw_uni (void)
	Get value of positive unipolar saw wave for current phase.
float	saw_bi_off (const float offset)
	Get current value of bipolar saw wave for phase with offset. More...
float	saw_uni_off (const float offset)
	Get current value of positive unipolar saw wave for phase with offset. More...
float	square_bi (void)
	Get current value of bipolar square wave for current phase.
float	square_uni (void)
	Get value of positive unipolar square wave for current phase.
float	square_bi_off (const float offset)
	Get current value of bipolar square wave for phase with offset. More...
float	square_uni_off (const float offset)
	Get current value of positive unipolar square wave for phase with offset. More...

Public Attributes
q31_t	phi0
q31_t	w0

Detailed Description

Simple LFO.

Definition at line 55 of file simplelfo.hpp.

Member Function Documentation

saw_bi_off()

float dsp::SimpleLFO::saw_bi_off ( const float  offset )

inline

Get current value of bipolar saw wave for phase with offset.

Parameters

offset

Offset to apply to current phase, in [-1, 1]

Definition at line 231 of file simplelfo.hpp.

    {
      const q31_t phi = phi0 + (f32_to_q31(offset)<<1);
      return q31_to_f32(phi);
    }          

saw_uni_off()

float dsp::SimpleLFO::saw_uni_off ( const float  offset )

inline

Get current value of positive unipolar saw wave for phase with offset.

Parameters

offset

Offset to apply to current phase, in [-1, 1]

Definition at line 243 of file simplelfo.hpp.

    {
      q31_t phi = phi0 + (f32_to_q31(offset)<<1);        
      return 0.5f * phi + 0.5f;
      phi >>= 1;
      return q31_to_f32(qadd(phi,0x40000000));
    }

setF0()

void dsp::SimpleLFO::setF0 ( const float  f0, const float  fsrecip  )

inline

Set LFO frequency.

param f0 Frequency in Hz param fsrecip Reciprocal of sampling frequency (1/Fs)

Definition at line 101 of file simplelfo.hpp.

    {
      w0 = f32_to_q31(2.f * f0 * fsrecip);
    }

setW0()

void dsp::SimpleLFO::setW0 ( const float  w )

inline

Set LFO frequency in radians.

Parameters

w	Frequency in radians

Definition at line 112 of file simplelfo.hpp.

    {
      w0 = f32_to_q31(2.f * w);
    }

sine_bi_off()

float dsp::SimpleLFO::sine_bi_off ( const float  offset )

inline

Get current value of bipolar sine wave for phase with offset.

Parameters

offset

Offset to apply to current phase, in [-1, 1]

Definition at line 145 of file simplelfo.hpp.

    {
      const float phi = q31_to_f32(phi0 + f32_to_q31(2*offset));
      return 4 * phi * (si_fabsf(phi) - 1.f);
    }          

sine_uni_off()

float dsp::SimpleLFO::sine_uni_off ( const float  offset )

inline

Get current value of positive unipolar sine wave for phase with offset.

Parameters

offset

Offset to apply to current phase, in [-1, 1]

Definition at line 157 of file simplelfo.hpp.

    {
      const float phi = q31_to_f32(phi0 + f32_to_q31(2*offset));
      return 0.5f + 2 * phi * (si_fabsf(phi) - 1.f);
    }          

square_bi_off()

float dsp::SimpleLFO::square_bi_off ( const float  offset )

inline

Get current value of bipolar square wave for phase with offset.

Parameters

offset

Offset to apply to current phase, in [-1, 1]

Definition at line 276 of file simplelfo.hpp.

    {
      const q31_t phi = phi0 + (f32_to_q31(offset)<<1);
      return (phi < 0) ? -1.f : 1.f;
    }          

square_uni_off()

float dsp::SimpleLFO::square_uni_off ( const float  offset )

inline

Get current value of positive unipolar square wave for phase with offset.

Parameters

offset

Offset to apply to current phase, in [-1, 1]

Definition at line 288 of file simplelfo.hpp.

    {
      const q31_t phi = phi0 + (f32_to_q31(offset)<<1);
      return (phi < 0) ? 0.f : 1.f;
    }

triangle_bi_off()

float dsp::SimpleLFO::triangle_bi_off ( const float  offset )

inline

Get current value of bipolar triangle wave for phase with offset.

Parameters

offset

Offset to apply to current phase, in [-1, 1]

Definition at line 188 of file simplelfo.hpp.

    {
      const q31_t phi = phi0 + f32_to_q31(2*offset);
      return q31_to_f32(qsub(q31abs(phi),0x40000000)<<1);
    }          

triangle_uni_off()

float dsp::SimpleLFO::triangle_uni_off ( const float  offset )

inline

Get current value of positive unipolar triangle wave for phase with offset.

Parameters

offset

Offset to apply to current phase, in [-1, 1]

Definition at line 200 of file simplelfo.hpp.

    {
      const float phi = q31_to_f32(phi0 + f32_to_q31(2*offset));
      return si_fabsf(phi); 
    }

---

The documentation for this struct was generated from the following file:

• /home/etienne/Documents/_projects/logue-sdk/logue-sdk-alt/platform/minilogue-xd/inc/dsp/simplelfo.hpp