Contents

vDSP_hamm_windowD

Creates a double-precision Hamming window.

Declaration

extern void vDSP_hamm_windowD(double *__C, vDSP_Length __N, int __Flag);

Parameters

  • __C:

    The output vector.

  • __N:

    The number of elements in the output vector.

  • __Flag:

    A value that specifies whether the function creates a half window or a full window. Pass the Vdsp_half_window flag to create only the first (N+1)/2 points; pass 0 to create a full-size window.

Discussion

The vDSP_hamm_window and vDSP_hamm_windowD functions create a Hamming window vector using the following operation:

for (n=0; n < N; ++n)
{
    C[n] = 0.54 - (0.46 * cos( 2 * pi * n / N ) );
}

The following code shows how to generate a Hamming window:

let n = vDSP_Length(1024)

var c = [Float](repeating: 0,
                count: Int(n))

vDSP_hamm_window(&c,
                 n,
                 0)

The following illustrates the values of the output vector, c:

[Image]

See Also

Vector generation with window functions