/Users/richardeakin/projects/libsms/trunk/src/tables.c File Reference

sin and sinc tables. More...

#include "sms.h"

Include dependency graph for tables.c:

Functions
int	sms_prepSine (int nTableSize)
	prepares the sine table
void	sms_clearSine ()
	clear sine table
sfloat	sms_sine (sfloat fTheta)
	table-lookup sine method
static sfloat	Sinc (sfloat x, sfloat N)
	Sinc method to generate the lookup table.
int	sms_prepSinc (int nTableSize)
	prepare the Sinc table
void	sms_clearSinc ()
	clear sine table
sfloat	sms_sinc (sfloat fTheta)
	global sinc table-lookup method
Variables
static sfloat	fSineScale
	value to scale the sine-table-lookup phase
static sfloat	fSineIncr
	inverse of fSineScale - turns a division into multiplication
static sfloat	fSincScale
	value to scale the sinc-table-lookup phase
static sfloat *	sms_tab_sine
	global pointer to the sine table
static sfloat *	sms_tab_sinc
	global pointer to the sinc table

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Detailed Description

sin and sinc tables.

contains functions for creating and indexing the tables

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Function Documentation

static sfloat Sinc	(	sfloat	x,
		sfloat	N
	)			[static]

Sinc method to generate the lookup table.

Referenced by sms_prepSinc().

void sms_clearSinc

(

void

)

clear sine table

References sms_tab_sinc.

Referenced by sms_free().

void sms_clearSine

(

void

)

clear sine table

References sms_tab_sine.

Referenced by sms_free().

int sms_prepSinc

(

int

nTableSize

)

prepare the Sinc table

used for the main lobe of a frequency domain BlackmanHarris92 window

Parameters:

nTableSize

size of table

Returns:

error code

See also:

SMS_MALLOC in SMS_ERRORS

References fSincScale, sfloat, Sinc(), SMS_MALLOC, SMS_OK, sms_tab_sinc, and TWO_PI.

Referenced by sms_init().

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int sms_prepSine

(

int

nTableSize

)

prepares the sine table

Parameters:

nTableSize

size of table

Returns:

error code

See also:

SMS_MALLOC in SMS_ERRORS

References fSineIncr, fSineScale, sfloat, SMS_MALLOC, SMS_OK, sms_tab_sine, and TWO_PI.

Referenced by sms_init().

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Variable Documentation

sfloat fSincScale [static]

value to scale the sinc-table-lookup phase

Referenced by sms_prepSinc(), and sms_sinc().

sfloat fSineIncr [static]

inverse of fSineScale - turns a division into multiplication

Referenced by sms_prepSine(), and sms_sine().

sfloat fSineScale [static]

value to scale the sine-table-lookup phase

Referenced by sms_prepSine().

sfloat* sms_tab_sinc [static]

global pointer to the sinc table

Referenced by sms_clearSinc(), sms_prepSinc(), and sms_sinc().

sfloat* sms_tab_sine [static]

global pointer to the sine table

Referenced by sms_clearSine(), sms_prepSine(), and sms_sine().