Turbulence against solid objects

Typedefs
typedef struct SDTWindFlow	SDTWindFlow
	Opaque data structure for a solid obstacle object.
typedef struct SDTWindFlow	SDTWindFlow
	Opaque data structure for a solid obstacle object.

Functions
SDTWindFlow *	SDTWindFlow_new ()
	Object constructor. More...
void	SDTWindFlow_free (SDTWindFlow *x)
	Object destructor. More...
void	SDTWindFlow_setFilters (SDTWindFlow *x)
	Update filter coefficients. Should be always called after setting the sampling rate with SDT_setSampleRate(). More...
void	SDTWindFlow_setWindSpeed (SDTWindFlow *x, double f)
	Sets the wind speed. More...
double	SDTWindFlow_dsp (SDTWindFlow *x)
	Signal processing routine. Call this function at sample rate to synthesize a wind turbulence sound. More...

Detailed Description

One of the possible sources of turbulence is the impact on a large solid surface. In this case, turbulence is generated due to the impact of the air molecules on the surface and to their random change of direction caused by the irregularities of the surface itself. The resulting sound is modeled through a bandpass-filtered white noise generator. The center frequency and bandwidth of the filter are empirically set to fixed values, while the resulting output is modulated in amplitude according to the velocity of the air flow.

Function Documentation

double SDTWindFlow_dsp

(

SDTWindFlow *

x

)

Signal processing routine. Call this function at sample rate to synthesize a wind turbulence sound.

Returns

Computed audio sample

void SDTWindFlow_free

(

SDTWindFlow *

x

)

Object destructor.

Parameters

[in]

x

Pointer to the instance to destroy

SDTWindFlow * SDTWindFlow_new

(

)

Object constructor.

Returns

Pointer to the new instance

void SDTWindFlow_setFilters

(

SDTWindFlow *

x

)

Update filter coefficients. Should be always called after setting the sampling rate with SDT_setSampleRate().

Parameters

[in]

x

Pointer to a SDTWindFlow instance

void SDTWindFlow_setWindSpeed	(	SDTWindFlow *	x,
		double	f
	)

Sets the wind speed.

Parameters

[in]	x	Pointer to a SDTWindFlow instance
[in]	f	Wind speed [0,1]