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

## 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 parameter`Log2N`

of this transform function.`__A`

Complex input vector where multiple signals are concatenated.

`__IA`

Stride between elements in

`A`

. The value of`IA`

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 of`IC`

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. For example, to process 1024 elements, specify 10 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

This function performs discrete Fourier transforms on multiple input signals using a single call. They can be used for efficient processing of small input signals (less than 512 points). They 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 functions compute out-of-place real 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.