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: Unsafe Pointer<DSPSplit Complex>, _ __IA: v DSP _Stride, _ __IMA: v DSP _Stride, _ __C: Unsafe Pointer<DSPSplit Complex>, _ __IC: v DSP _Stride, _ __IMC: v DSP _Stride, _ __Log2N: v DSP _Length, _ __M: v DSP _Length, _ __Direction: FFTDirection)
Parameters
__Setup
Points to a structure initialized by a prior call to the FFT setup data function,
v
. The value supplied as parameterDSP _create _fftsetup Log2n
of the earlier call to the setup function must equal or exceed the value supplied as parameterLog2N
of this transform function.__A
Complex input vector where multiple signals are concatenated.
__IA
Stride between elements in
A
. The value ofIA
should be 1 for best performance.__IMA
Stride (in elements) between signals in the vector
A
(which is also the length of each signal, measured in elements).__C
Complex output vector where multiple signals are concatenated.
__IC
Stride between elements in
C
. The value ofIC
should be 1 for best performance.__IMC
Stride (in elements) between signals in the vector
C
(which is also the length of each signal, measured in elements).__Log2N
The 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
.__M
The number of input signals.
__Direction
A 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.