Contents

vDSP.DCTTransformType.IV

A constant that represents a type-IV discrete cosine transform.

Declaration

case IV

Discussion

The type-IV DCT uses the following operation for a discrete cosine transform:

// `N` is the length given in the setup.
// `h` is the input array that contains real numbers.
// `H` is the output array that contains real numbers.

For 0 <= k < N
    Or[k] = sum(Ir[j] * cos((k+1/2) * (j+1/2) * pi / N, 0 <= j < N)

See Also

Discrete Cosine Transform Type Constants