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//void fft (FLOAT[BLKSIZE], FLOAT[BLKSIZE], FLOAT[BLKSIZE], FLOAT[BLKSIZE], int);
void psycho_2_fft (FLOAT * x_real, FLOAT * energy, FLOAT * phi);
void psycho_1_fft (FLOAT * x_real, FLOAT * energy, int N);
void atan_table_init(void);
FLOAT atan_table(FLOAT y, FLOAT x);
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