Contents

vDSP_desamp

Performs single-precision FIR filtering with decimation and antialiasing.

Declaration

extern void vDSP_desamp(const float *__A, vDSP_Stride __DF, const float *__F, float *__C, vDSP_Length __N, vDSP_Length __P);

Parameters

  • __A:

    Single-precision real input vector. The size of A must be at least DF * (N-1) + P (see below).

  • __DF:

    Decimation factor.

  • __F:

    Single-precision real filter vector.

  • __C:

    Single-precision real output vector.

  • __N:

    Length of output vector C.

  • __P:

    Length of filter vector F.

Mentioned in

Discussion

Performs finite impulse response (FIR) filtering at selected positions of the input vector A, with the filter F, using the decimation factor DF. Results are left in the output vector C.

This function can run in place, but C cannot be in place with F.

This function’s operation is indicated by the following pseudocode:

for (n = 0; n < N; ++n)
{
    sum = 0;
    for (p = 0; p < P; ++p)
        sum += A[n * DF + p] * F[p];
    C[n] = sum;
}

See Also

Real Vectors