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A simple FFT implementation provided for convenience of plugin authors. Chris@3: More...

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#include <FFT.h>

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Chris@3: Static Public Member Functions
static void	forward (unsigned int n, const double ri, const double ii, double ro, double io)
	Calculate a one-shot forward transform of size n. More...

static void	inverse (unsigned int n, const double ri, const double ii, double ro, double io)
	Calculate a one-shot inverse transform of size n. More...

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Detailed Description

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A simple FFT implementation provided for convenience of plugin authors.

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This class provides one-shot (i.e. fixed table state is recalculated every time) double-precision complex-complex transforms. For repeated transforms from real time-domain data, use an FFTComplex or FFTReal object instead.

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Note: If the SDK has been compiled with the SINGLE_PRECISION_FFT flag, then all FFTs will use single precision internally. The default is double precision. The API uses doubles in either case.

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The forward transform is unscaled; the inverse transform is scaled by 1/n.

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Definition at line 59 of file FFT.h.

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Member Function Documentation

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◆ forward()

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static void Vamp::FFT::forward	(	unsigned int	n,
		const double *	ri,
		const double *	ii,
		double *	ro,
		double *	io
	)

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Calculate a one-shot forward transform of size n.

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n must be a multiple of 2.

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ri and ii must point to the real and imaginary component arrays of the input. For real input, ii may be NULL.

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ro and io must point to enough space to receive the real and imaginary component arrays of the output.

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All input and output arrays are of size n.

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◆ inverse()

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static void Vamp::FFT::inverse	(	unsigned int	n,
		const double *	ri,
		const double *	ii,
		double *	ro,
		double *	io
	)

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Calculate a one-shot inverse transform of size n.

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n must be a power of 2, greater than 1.

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ri and ii must point to the real and imaginary component arrays of the input. For real input, ii may be NULL.

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ro and io must point to enough space to receive the real and imaginary component arrays of the output. The output is scaled by 1/n. The output pointers may not be NULL, even if the output is expected to be real.

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All input and output arrays are of size n.

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

FFT.h

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Chris@3: Static Public Member Functions

Detailed Description

Member Function Documentation

◆ forward()

◆ inverse()