/home/brennan/n-sim/Vaike/linux/system-addons/apps/int_fft.c File Reference

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Defines

#define FIX_MPY(DEST, A, B)   DEST = ((long)(A) * (long)(B))>>15

#define N_WAVE   1024

#define LOG2_N_WAVE   10

#define N_LOUD   100

#define fixed   short

Functions

int db_from_ampl (fixed re, fixed im)

fixed fix_mpy (fixed a, fixed b)

int fix_fft (fixed fr[], fixed fi[], int m, int inverse)

void window (fixed fr[], int n)

void fix_loud (fixed loud[], fixed fr[], fixed fi[], int n, int scale_shift)

int iscale (int value, int numer, int denom)

fixed fix_dot (fixed *hpa, fixed *pb, int n)

Variables

fixed Sinewave [N_WAVE]

fixed Loudampl [N_LOUD]

Define Documentation

#define FIX_MPY ( DEST,
A,
B ) DEST = ((long)(A) * (long)(B))>>15

Definition at line 58 of file int_fft.c.
Referenced by fix_dot(), fix_mpy(), and window().

#define fixed short

Definition at line 64 of file int_fft.c.
Referenced by fix_dot(), and fix_fft().

#define LOG2_N_WAVE 10

Definition at line 61 of file int_fft.c.

#define N_LOUD 100

Definition at line 62 of file int_fft.c.
Referenced by db_from_ampl().

#define N_WAVE 1024

Definition at line 60 of file int_fft.c.
Referenced by fix_fft(), and window().

Function Documentation

int db_from_ampl ( fixed re,

fixed im

)

Definition at line 218 of file int_fft.c.
References Loudampl, and N_LOUD.
Referenced by fix_loud().

fixed fix_dot ( fixed * hpa,

fixed * pb,

int n

)

Definition at line 270 of file int_fft.c.
References a, FIX_MPY, and fixed.

int fix_fft ( fixed fr[],

fixed fi[],

int m,

int inverse

)

Definition at line 80 of file int_fft.c.
References fixed, and N_WAVE.
Referenced by sensor_app().

void fix_loud ( fixed loud[],

fixed fr[],

fixed fi[],

int n,

int scale_shift

)

Definition at line 199 of file int_fft.c.
References db_from_ampl(), and max.

fixed fix_mpy ( fixed a,

fixed b

)

Definition at line 245 of file int_fft.c.
References FIX_MPY.

int iscale ( int value,

int numer,

int denom

)

Definition at line 254 of file int_fft.c.

void window ( fixed fr[],

int n

)

Definition at line 179 of file int_fft.c.
References FIX_MPY, N_WAVE, and Sinewave.

Variable Documentation

fixed Loudampl

Initial value:
{ 32767, 29203, 26027, 23197, 20674, 18426, 16422, 14636, 13044, 11626, 10361, 9234, 8230, 7335, 6537, 5826, 5193, 4628, 4125, 3676, 3276, 2920, 2602, 2319, 2067, 1842, 1642, 1463, 1304, 1162, 1036, 923, 823, 733, 653, 582, 519, 462, 412, 367, 327, 292, 260, 231, 206, 184, 164, 146, 130, 116, 103, 92, 82, 73, 65, 58, 51, 46, 41, 36, 32, 29, 26, 23, 20, 18, 16, 14, 13, 11, 10, 9, 8, 7, 6, 5, 5, 4, 4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, }

Definition at line 430 of file int_fft.c.
Referenced by db_from_ampl().

fixed Sinewave

Definition at line 297 of file int_fft.c.
Referenced by window().