FFTDriverCmsisFFT Class Reference

Driver for Cmsis-FFT see https://arm-software.github.io/CMSIS_5/DSP. More...

#include <AudioCmsisFFT.h>

Inheritance diagram for FFTDriverCmsisFFT:

Public Member Functions
bool	begin (int len) override
void	end () override
void	fft () override
	Perform FFT.
bool	getBin (int pos, FFTBin &bin) override
	gets the value of a bin
float	getValue (int idx) override
	Get result value from Reverse FFT.
bool	isReverseFFT () override
	Returns true if reverse FFT is supported.
bool	isValid () override
float	magnitude (int idx) override
	Calculate the magnitude (fft result) at index (sqr(i² + r²))
float	magnitudeFast (int idx) override
	same as magnitude
void	rfft () override
	Calculate reverse FFT.
bool	setBin (int pos, FFTBin &bin)
	sets the value of a bin
bool	setBin (int pos, float real, float img) override
	sets the value of a bin
void	setValue (int idx, float value) override
	Sets the real value.

Public Attributes
arm_rfft_fast_instance_f32	fft_instance
float *	input =nullptr
int	len
float *	output =nullptr
float *	output_magn =nullptr
uint32_t	result_index = 0
float	result_max_value
arm_status	status

Detailed Description

Driver for Cmsis-FFT see https://arm-software.github.io/CMSIS_5/DSP.

Author

Phil Schatzmann

Copyright

GPLv3

Member Function Documentation

begin()

bool begin ( int  len )

inlineoverridevirtual

Implements FFTDriver.

end()

void end ( )

inlineoverridevirtual

Implements FFTDriver.

fft()

void fft ( )

inlineoverridevirtual

Perform FFT.

Implements FFTDriver.

getBin()

bool getBin ( int  pos, FFTBin &  bin  )

inlineoverridevirtual

gets the value of a bin

Reimplemented from FFTDriver.

getValue()

float getValue ( int  pos )

inlineoverridevirtual

Get result value from Reverse FFT.

Implements FFTDriver.

isReverseFFT()

bool isReverseFFT ( )

inlineoverridevirtual

Returns true if reverse FFT is supported.

Reimplemented from FFTDriver.

isValid()

bool isValid ( )

inlineoverridevirtual

Implements FFTDriver.

magnitude()

float magnitude ( int  idx )

inlineoverridevirtual

Calculate the magnitude (fft result) at index (sqr(i² + r²))

Implements FFTDriver.

magnitudeFast()

float magnitudeFast ( int  idx )

inlineoverridevirtual

same as magnitude

Implements FFTDriver.

rfft()

void rfft ( )

inlineoverridevirtual

Calculate reverse FFT.

Reimplemented from FFTDriver.

setBin() [1/2]

bool setBin ( int  pos, FFTBin &  bin  )

inlineinherited

sets the value of a bin

setBin() [2/2]

bool setBin ( int  idx, float  real, float  img  )

inlineoverridevirtual

sets the value of a bin

Reimplemented from FFTDriver.

setValue()

void setValue ( int  pos, float  value  )

inlineoverridevirtual

Sets the real value.

Implements FFTDriver.

Member Data Documentation

fft_instance

arm_rfft_fast_instance_f32 fft_instance

input

float* input =nullptr

len

int len

output

float* output =nullptr

output_magn

float* output_magn =nullptr

result_index

uint32_t result_index = 0

result_max_value

float result_max_value

status

arm_status status

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The documentation for this class was generated from the following file:

• src/AudioTools/AudioLibs/AudioCmsisFFT.h