misc.h File Reference

#include <math.h>

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Macros
#define	M_PI   3.14159265358979323846

Functions
float	sinc (float x)
float	cosc (float x)
float	clamp (float x, float min, float max)
float	decayavg (float average, float input, int weight)
	This is always called with an int weight. More...
float	blackman (float x)
float	hamming (float x)
float	hanning (float x)
float	rcos (float t, float T, float alpha=1.0)

Macro Definition Documentation

M_PI

#define M_PI   3.14159265358979323846

Definition at line 30 of file misc.h.

Referenced by blackman(), cosc(), hamming(), hanning(), rcos(), and sinc().

Function Documentation

blackman()

float blackman ( float  x )

inline

Definition at line 55 of file misc.h.

References cos(), and M_PI.

{
    return (0.42 - 0.50 * cos(2 * M_PI * x) + 0.08 * cos(4 * M_PI * x));
}

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clamp()

float clamp ( float  x, float  min, float  max  )

inline

Definition at line 42 of file misc.h.

References leansdr::max(), and leansdr::min().

{
    return (x < min) ? min : ((x > max) ? max : x);
}

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cosc()

float cosc ( float  x )

inline

Definition at line 37 of file misc.h.

References cos(), and M_PI.

{
    return (fabs(x) < 1e-10) ? 0.0 : ((1.0 - cos(M_PI * x)) / (M_PI * x));
}

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decayavg()

float decayavg ( float  average, float  input, int  weight  )

inline

This is always called with an int weight.

Definition at line 48 of file misc.h.

{
    if (weight <= 1) return input;
    return ( ( input - average ) / (float)weight ) + average ;
}

hamming()

float hamming ( float  x )

inline

Definition at line 60 of file misc.h.

References cos(), and M_PI.

{
    return 0.54 - 0.46 * cos(2 * M_PI * x);
}

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hanning()

float hanning ( float  x )

inline

Definition at line 65 of file misc.h.

References cos(), and M_PI.

{
    return 0.5 - 0.5 * cos(2 * M_PI * x);
}

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rcos()

float rcos ( float  t, float  T, float  alpha = 1.0  )

inline

Definition at line 70 of file misc.h.

References cos(), M_PI, and sin().

{
    if( t == 0 ) return 1.0;
    float taT = T / (2.0 * alpha);
    if( fabs(t) == taT ) return ((alpha/2.0) * sin(M_PI/(2.0*alpha)));
    return (sin(M_PI*t/T)/(M_PI*t/T))*cos(alpha*M_PI*t/T)/(1.0-(t/taT)*(t/taT));
}

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sinc()

float sinc ( float  x )

inline

Definition at line 32 of file misc.h.

References M_PI, and sin().

Referenced by leansdr::filtergen::lowpass().

{
    return (fabs(x) < 1e-10) ? 1.0 : (sin(M_PI * x) / (M_PI * x));
}

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