One way to calculate a discrete cosine transform is to use the Fourier transformation.
w ʌ n WORD_BOUNDARY w eɪ WORD_BOUNDARY t ə WORD_BOUNDARY k æ l k j ʊ l eɪ t WORD_BOUNDARY ʌ WORD_BOUNDARY d ɪ s k ɹ iː t WORD_BOUNDARY k oʊ s aɪ n WORD_BOUNDARY t ɹ æ n s f ɔ ɹ m WORD_BOUNDARY ɪ z WORD_BOUNDARY t ə WORD_BOUNDARY j uː z WORD_BOUNDARY ð ə WORD_BOUNDARY f ɔ ɹ i ə ɹ WORD_BOUNDARY t ɹ æ n s f ɔ ɹ m eɪ ʃ ə n WORD_BOUNDARY