mfcc_example.c File Reference

#include <avr32/io.h>
#include "cycle_counter.h"
#include "power_clocks_lib.h"
#include "dsp.h"
#include "conf_mfcc.h"

Macros
#define	INPUT_FRAME_NB_SAMPLES   ((MFCC_INPUT_FS * MFCC_FRAME_SIZE_MS) / 1000)
	Input frame size in number of samples. More...
#define	INPUT_FRAME_SHIFT_NB_SAMPLES   ((MFCC_INPUT_FS * MFCC_FRAME_SHIFT_MS) / 1000)
	frame shift in number of samples More...

Functions
dsp16_t *	generate_input_signal ()
int	main (void)
S32 *	mfcc_dct_13_pts (S32 *buffer, int size)
dsp16_t *	mfcc_fft_512pts (dsp16_t *buffer, int size)
dsp16_t *	mfcc_hamming_window (dsp16_t *buffer, int size)
void	mfcc_init ()
S32	mfcc_lin_to_mel (S32 f_hz)
S32 *	mfcc_log (S32 *buffer, int size)
S32 *	mfcc_mel_scale_filter_bank (dsp16_t *buffer, int size)
void	mfcc_mel_scale_filter_bank_init ()
S32	mfcc_mel_to_lin (S32 f_mel_hz)
S32 *	mfcc_numerical_diff_13 (S32 *cepstrum)
dsp16_t *	mfcc_pre_emphasis (dsp16_t *buffer, int size)
void	mfcc_process ()
	This function should be called every MFCC_FRAME_SHIFT_MS ms. More...

Variables
A_ALIGNED dsp16_t	hamming_window [INPUT_FRAME_NB_SAMPLES]
A_ALIGNED dsp16_t	input_frame [INPUT_FRAME_NB_SAMPLES]
int	pt_mel [MEL_FILTER_BANK_NB_CHANNELS+2]
A_ALIGNED dsp16_t	temp_buffer [1024]

#define INPUT_FRAME_NB_SAMPLES   ((MFCC_INPUT_FS * MFCC_FRAME_SIZE_MS) / 1000)

Input frame size in number of samples.

Referenced by generate_input_signal(), mfcc_init(), and mfcc_process().

#define INPUT_FRAME_SHIFT_NB_SAMPLES   ((MFCC_INPUT_FS * MFCC_FRAME_SHIFT_MS) / 1000)

frame shift in number of samples

Referenced by generate_input_signal().

dsp16_t* generate_input_signal

(

)

< To generate frequency in the pass band.

References A_ALIGNED, dsp16_gen_sin(), DSP16_Q, dsp16_vect_add(), dsp16_vect_max(), dsp16_vect_realdiv(), dsp16_vect_realmul(), GEN_INPUT_NB_SINES, i, input_frame, INPUT_FRAME_NB_SAMPLES, INPUT_FRAME_SHIFT_NB_SAMPLES, max, and MFCC_INPUT_FS.

Referenced by mfcc_init(), and mfcc_process().

int main

(

void

)

References gc_dfllif_ref_opt, i, if(), mfcc_init(), mfcc_process(), pcl_configure_clocks(), pcl_dfll_freq_param, pcl_freq_param_t, PCL_MC_DFLL0, SCIF_GCCTRL_SLOWCLOCK, and UNUSED.

S32* mfcc_dct_13_pts	(	S32 *	buffer,
		int	size
	)

References dsp16_op_cos(), DSP16_Q, DSP16_QB, n, and temp.

Referenced by mfcc_process().

dsp16_t* mfcc_fft_512pts	(	dsp16_t *	buffer,
		int	size
	)

References A_ALIGNED, dsp16_op_mul(), DSP16_Q, dsp16_trans_realcomplexfft(), dsp16_vect_max(), dsp16_vect_zeropad(), FFT_INTEGER_GAIN, i, and max.

Referenced by mfcc_process().

dsp16_t* mfcc_hamming_window	(	dsp16_t *	buffer,
		int	size
	)

References dsp16_vect_dotmul(), and hamming_window.

Referenced by mfcc_process().

void mfcc_init

(

)

References DSP16_Q, dsp16_vect_zeropad(), dsp16_win_hamm(), generate_input_signal(), hamming_window, i, input_frame, INPUT_FRAME_NB_SAMPLES, mfcc_mel_scale_filter_bank_init(), and temp_buffer.

Referenced by main().

S32 mfcc_lin_to_mel

(

S32

f_hz

)

References CST_LN_10, dsp16_op_ln_raw(), DSP16_Q, DSP16_QB, and DSP_Q.

Referenced by mfcc_mel_scale_filter_bank_init().

S32* mfcc_log	(	S32 *	buffer,
		int	size
	)

References dsp16_op_ln_raw(), and i.

Referenced by mfcc_process().

S32* mfcc_mel_scale_filter_bank	(	dsp16_t *	buffer,
		int	size
	)

References dsp16_op_mul(), DSP16_Q, i, j, length, MEL_FILTER_BANK_NB_CHANNELS, and pt_mel.

Referenced by mfcc_process().

void mfcc_mel_scale_filter_bank_init

(

)

References i, MEL_FILTER_BANK_NB_CHANNELS, MFCC_INPUT_FS, mfcc_lin_to_mel(), mfcc_mel_to_lin(), and pt_mel.

Referenced by mfcc_init().

S32 mfcc_mel_to_lin

(

S32

f_mel_hz

)

References DSP16_QB, and DSP_Q.

Referenced by mfcc_mel_scale_filter_bank_init().

S32* mfcc_numerical_diff_13

(

S32 *

cepstrum

)

References i.

Referenced by mfcc_process().

dsp16_t* mfcc_pre_emphasis	(	dsp16_t *	buffer,
		int	size
	)

References dsp16_op_mul(), DSP16_Q, i, and PRE_EMPHASIS_ALPHA.

Referenced by mfcc_process().

void mfcc_process

(

)

This function should be called every MFCC_FRAME_SHIFT_MS ms.

References generate_input_signal(), Get_sys_count, input_frame, INPUT_FRAME_NB_SAMPLES, MEL_FILTER_BANK_NB_CHANNELS, mfcc_dct_13_pts(), mfcc_fft_512pts(), mfcc_hamming_window(), mfcc_log(), mfcc_mel_scale_filter_bank(), mfcc_numerical_diff_13(), mfcc_pre_emphasis(), and temp_buffer.

Referenced by main().

A_ALIGNED dsp16_t hamming_window[INPUT_FRAME_NB_SAMPLES]

Referenced by mfcc_hamming_window(), and mfcc_init().

A_ALIGNED dsp16_t input_frame[INPUT_FRAME_NB_SAMPLES]

Referenced by generate_input_signal(), mfcc_init(), and mfcc_process().

int pt_mel[MEL_FILTER_BANK_NB_CHANNELS+2]

Referenced by mfcc_mel_scale_filter_bank(), and mfcc_mel_scale_filter_bank_init().

A_ALIGNED dsp16_t temp_buffer[1024]

Referenced by mfcc_init(), and mfcc_process().