DSP API Fourier transform related functions

Functions
DLL_EXPORT void	dsp_fourier_dft (dsp_stream_p stream, int exp)
	Perform a discrete Fourier Transform of a dsp_stream.
DLL_EXPORT void	dsp_fourier_idft (dsp_stream_p stream)
	Perform an inverse discrete Fourier Transform of a dsp_stream.
DLL_EXPORT void	dsp_fourier_2dsp (dsp_stream_p stream)
	Fill the magnitude and phase buffers with the current data in stream->dft.
DLL_EXPORT void	dsp_fourier_2complex_t (dsp_stream_p stream)
	Obtain the complex fourier transform from the current magnitude and phase buffers.
DLL_EXPORT void	dsp_fourier_phase_mag_array_get_complex (double *mag, double *phi, complex_t *out, int len)
	Obtain a complex array from phase and magnitude arrays.
DLL_EXPORT double *	dsp_fourier_complex_array_get_magnitude (dsp_complex in, int len)
	Obtain a complex number's array magnitudes.
DLL_EXPORT double *	dsp_fourier_complex_array_get_phase (dsp_complex in, int len)
	Obtain a complex number's array phases.

Detailed Description

Function Documentation

dsp_fourier_2complex_t()

DLL_EXPORT void dsp_fourier_2complex_t

(

dsp_stream_p

stream

)

Obtain the complex fourier transform from the current magnitude and phase buffers.

Parameters

stream

the inout stream.

Definition at line 58 of file fft.c.

dsp_fourier_2dsp()

DLL_EXPORT void dsp_fourier_2dsp

(

dsp_stream_p

stream

)

Fill the magnitude and phase buffers with the current data in stream->dft.

Parameters

stream

the inout stream.

Definition at line 35 of file fft.c.

dsp_fourier_complex_array_get_magnitude()

DLL_EXPORT double * dsp_fourier_complex_array_get_magnitude	(	dsp_complex	in,
		int	len
	)

Obtain a complex number's array magnitudes.

Parameters

in	the input complex number array.
len	the input array length.

Returns

the array filled with the magnitudes

Definition at line 81 of file fft.c.

dsp_fourier_complex_array_get_phase()

DLL_EXPORT double * dsp_fourier_complex_array_get_phase	(	dsp_complex	in,
		int	len
	)

Obtain a complex number's array phases.

Parameters

in	the input complex number array.
len	the input array length.

Returns

the array filled with the phases

Definition at line 93 of file fft.c.

dsp_fourier_dft()

DLL_EXPORT void dsp_fourier_dft	(	dsp_stream_p	stream,
		int	exp
	)

Perform a discrete Fourier Transform of a dsp_stream.

Parameters

stream	the inout stream.
exp	the exponent (recursivity) of the fourier transform.

Definition at line 135 of file fft.c.

dsp_fourier_idft()

DLL_EXPORT void dsp_fourier_idft

(

dsp_stream_p

stream

)

Perform an inverse discrete Fourier Transform of a dsp_stream.

Parameters

stream

the inout stream.

Definition at line 173 of file fft.c.

dsp_fourier_phase_mag_array_get_complex()

DLL_EXPORT void dsp_fourier_phase_mag_array_get_complex	(	double *	mag,
		double *	phi,
		complex_t *	out,
		int	len
	)

Obtain a complex array from phase and magnitude arrays.

Parameters

mag	the input magnitude array.
phi	the input phase array.
out	the output complex arrays.
len	the input arrays length.

Returns

the array filled with the complex numbers

Definition at line 115 of file fft.c.