Performs the same operation as v, but on multiple signals with a single call.
SDKs
- iOS 4.0+
- macOS 10.2+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 2.0+
Framework
- Accelerate
Declaration
func vDSP_fftm_zop(_ __Setup: FFTSetup, _ __A: UnsafeParameters
__SetupPoints to a structure initialized by a prior call to the FFT setup data function,
v. The value supplied as parameterDSP _create _fftsetup Log2nof the earlier call to the setup function must equal or exceed the value supplied as parameterLog2Nof this transform function.__AComplex input vector where multiple signals are concatenated.
__IAStride between elements in
A. The value ofIAshould be 1 for best performance.__IMAStride (in elements) between signals in the vector
A(which is also the length of each signal, measured in elements).__CComplex output vector where multiple signals are concatenated.
__ICStride between elements in
C. The value ofICshould be 1 for best performance.__IMCStride (in elements) between signals in the vector
C(which is also the length of each signal, measured in elements).__Log2NThe base 2 exponent of the number of elements to process in a single input signal. For example, to process 512 elements, specify 9 for parameter
Log2N.__MThe number of input signals.
__DirectionA forward/inverse directional flag, which must specify
k(+1) orFFTDirection _Forward k(-1).FFTDirection _Inverse
Discussion
The function performs discrete Fourier transforms on a number of different input signals at once, using a single call. It can be used for efficient processing of small input signals (less than 512 points). It will work for input signals of 4 points or greater. Each of the input signals processed by a given call must have the same length and address stride. The input signals are concatenated into a single output vector, the parameter C.
The function computes out-of-place complex discrete Fourier transforms of the input signals, either from the time domain to the frequency domain (forward) or from the frequency domain to the time domain (inverse).
See also functions v, v, and vDSP Programming Guide.