ðɪs jˈuːzᵻz ɐ dˈɪdʒɪɾəl mˌɑːdʒuːlˈeɪʃən kˈɔːld spɹˈɛd spˈɛktɹəm wˌɪtʃ spɹˈɛdz ðə vˈɔɪs dˈeɪɾə ˌoʊvɚɹ ɐ vˈɛɹi wˈaɪd tʃˈænəl ɪn sˈuːdoʊɹəndəm fˈæʃən jˈuːzɪŋ ɐ jˈuːzɚ ɔːɹ sˈɛl spəsˈɪfɪk sˈuːdoʊɹəndəm kˈoʊd.
This uses a digital modulation called spread spectrum which spreads the voice data over a very wide channel in pseudorandom fashion using a user or cell specific pseudorandom code.