Function

vDSP_fft3_zop(_:_:_:_:_:_:_:)

Computes an out-of-place radix-3 complex Fourier transform, either forward or inverse. The number of input and output values processed equals 3 times the power of 2 specified by parameter Log2N; single precision.

Declaration

func vDSP_fft3_zop(_ __Setup: FFTSetup, _ __A: UnsafePointer<DSPSplitComplex>, _ __IA: vDSP_Stride, _ __C: UnsafePointer<DSPSplitComplex>, _ __IC: vDSP_Stride, _ __Log2N: vDSP_Length, _ __Direction: FFTDirection)

Parameters

__Setup

A setup object as returned by a call to vDSP_create_fftsetup. kFFTRadix3 must be specified in the call to vDSP_create_fftsetup. Setup is preserved for reuse.

__A

Complex input vector.

__IA

Stride between elements in A. The value of IA should be 1 for best performance.

__C

Complex output vector.

__IC

Stride between elements in C. The value of IC should be 1 for best performance.

__Log2N

The base 2 exponent of the number of elements to process in a single input signal. Log2N must be between 3 and 15, inclusive.

__Direction

A forward/inverse directional flag, which must specify kFFTDirection_Forward (+1) or kFFTDirection_Inverse (-1)for an inverse transform.

Discussion

This performs the following operation:

mathematical formula

where F is Direction, C is A, j is the square root of -1, and N is two raised to the power of Log2N.

See also functions vDSP_create_fftsetup, vDSP_destroy_fftsetup, and vDSP Programming Guide.

See Also

1D Fast Fourier Transforms (Out-of-Place Complex)

func vDSP_fft_zop(FFTSetup, UnsafePointer<DSPSplitComplex>, vDSP_Stride, UnsafePointer<DSPSplitComplex>, vDSP_Stride, vDSP_Length, FFTDirection)

Computes an out-of-place single-precision complex discrete Fourier transform of the input vector, either from the time domain to the frequency domain (forward) or from the frequency domain to the time domain (inverse).

func vDSP_fft_zopD(FFTSetupD, UnsafePointer<DSPDoubleSplitComplex>, vDSP_Stride, UnsafePointer<DSPDoubleSplitComplex>, vDSP_Stride, vDSP_Length, FFTDirection)

Computes an out-of-place double-precision complex discrete Fourier transform of the input vector, either from the time domain to the frequency domain (forward) or from the frequency domain to the time domain (inverse).

func vDSP_fft_zopt(FFTSetup, UnsafePointer<DSPSplitComplex>, vDSP_Stride, UnsafePointer<DSPSplitComplex>, vDSP_Stride, UnsafePointer<DSPSplitComplex>, vDSP_Length, FFTDirection)

Computes an out-of-place single-precision complex discrete Fourier transform of the input vector, either from the time domain to the frequency domain (forward) or from the frequency domain to the time domain (inverse).

func vDSP_fft_zoptD(FFTSetupD, UnsafePointer<DSPDoubleSplitComplex>, vDSP_Stride, UnsafePointer<DSPDoubleSplitComplex>, vDSP_Stride, UnsafePointer<DSPDoubleSplitComplex>, vDSP_Length, FFTDirection)

Computes an out-of-place double-precision complex discrete Fourier transform of the input vector, either from the time domain to the frequency domain (forward) or from the frequency domain to the time domain (inverse).

func vDSP_fft3_zopD(FFTSetupD, UnsafePointer<DSPDoubleSplitComplex>, vDSP_Stride, UnsafePointer<DSPDoubleSplitComplex>, vDSP_Stride, vDSP_Length, FFTDirection)

Computes an out-of-place radix-3 complex Fourier transform, either forward or inverse. The number of input and output values processed equals 3 times the power of 2 specified by parameter Log2N; double precision.

Deprecated
func vDSP_fft5_zop(FFTSetup, UnsafePointer<DSPSplitComplex>, vDSP_Stride, UnsafePointer<DSPSplitComplex>, vDSP_Stride, vDSP_Length, FFTDirection)

Computes an out-of-place radix-5 complex Fourier transform, either forward or inverse. The number of input and output values processed equals 5 times the power of 2 specified by parameter Log2N; single precision.

Deprecated
func vDSP_fft5_zopD(FFTSetupD, UnsafePointer<DSPDoubleSplitComplex>, vDSP_Stride, UnsafePointer<DSPDoubleSplitComplex>, vDSP_Stride, vDSP_Length, FFTDirection)

Computes an out-of-place radix-5 complex Fourier transform, either forward or inverse. The number of input and output values processed equals 5 times the power of 2 specified by parameter Log2N; double precision.

Deprecated