haʊˈɛvɚ, ˈoʊnli smˈɔːl pˈɑːɹts ʌvðə tɚɹˈeɪn ˈɛvɚ kˈʌm ˌɪntʊ kˈɑːntækt wɪððə fˈʊt, ðˈɛɹfoːɹ ðə nˈɛsᵻsɚɹi kˌælkjʊlˈeɪʃənz ɑːɹ mˈɪnɪmˌaɪzd, ænd fˈɔls pˈɑːzᵻtˌɪvz kæn biː ɐksˈɛptᵻd ɪn sˈɜːʔn̩ sənˈæɹiˌoʊz.
However, only small parts of the terrain ever come into contact with the foot, therefore the necessary calculations are minimized, and false positives can be accepted in certain scenarios.