math_fixed.c File Reference

#include <inttypes.h>
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <string.h>
#include <float.h>
#include <tgmath.h>
#include <math.h>
#include "floating_fudge.h"
#include <assert.h>
#include "math_fixed_tables.h"
#include "spandsp/telephony.h"
#include "spandsp/bit_operations.h"
#include "spandsp/math_fixed.h"

Functions
uint16_t	fixed_reciprocal16 (uint16_t x, int *shift)
uint16_t	fixed_divide16 (uint16_t y, uint16_t x)
uint16_t	fixed_divide32 (uint32_t y, uint16_t x)
int16_t	fixed_log10_16 (uint16_t x)
int32_t	fixed_log10_32 (uint32_t x)
uint16_t	fixed_sqrt16 (uint16_t x)
uint16_t	fixed_sqrt32 (uint32_t x)
int16_t	fixed_sin (uint16_t x)
	Evaluate an approximate 16 bit fixed point sine.
int16_t	fixed_cos (uint16_t x)
	Evaluate an approximate 16 bit fixed point cosine.
uint16_t	fixed_atan2 (int16_t y, int16_t x)
	Evaluate an approximate 16 bit fixed point sine.

---

Detailed Description

---

Function Documentation

uint16_t fixed_atan2	(	int16_t	y,
		int16_t	x
	)

Evaluate an approximate 16 bit fixed point sine.

Evaluate an approximate 16 bit fixed point sine.

Parameters:

	y	.
	x	.

Returns:

The 16 bit unsigned angle, in 360/65536 degree steps.

int16_t fixed_cos

(

uint16_t

x

)

Evaluate an approximate 16 bit fixed point cosine.

Evaluate an approximate 16 bit fixed point cosine.

Parameters:

x

A 16 bit unsigned angle, in 360/65536 degree steps.

Returns:

cos(x)*32767.

int16_t fixed_sin

(

uint16_t

x

)

Evaluate an approximate 16 bit fixed point sine.

Evaluate an approximate 16 bit fixed point sine.

Parameters:

x

A 16 bit unsigned angle, in 360/65536 degree steps.

Returns:

sin(x)*32767.