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

void vDSP_fft3_zop(FFTSetup __Setup, const DSPSplitComplex *__A, vDSP_Stride __IA, const DSPSplitComplex *__C, vDSP_Stride __IC, vDSP_Length __Log2N, FFTDirection __Direction);

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)

vDSP_fft_zop

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).

vDSP_fft_zopD

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).

vDSP_fft_zopt

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).

vDSP_fft_zoptD

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).

vDSP_fftm_zop

Performs the same operation as vDSP_fft_zop, but on multiple signals with a single call.

vDSP_fftm_zopD

Performs the same operation as vDSP_fft_zopD, but on multiple signals with a single call.

vDSP_fftm_zopt

Performs the same operation as vDSP_fft_zopt, but on multiple signals with a single call.

vDSP_fftm_zoptD

Performs the same operation as vDSP_fft_zoptD, but on multiple signals with a single call.

vDSP_fft3_zopD

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
vDSP_fft5_zop

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
vDSP_fft5_zopD

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