lˈɪnɪɹ tˈaɪm ɪnvˈɛɹiənt ˌɛltˌiːˈaɪ sˈɪstəmz ɑːɹ ðoʊz sˈɪstəmz ɪnwˌɪtʃ ðə pɚɹˈæmɪɾɚz , ,  ænd ɑːɹ ɪnvˈɛɹiənt wɪð ɹᵻspˈɛkt tə tˈaɪm.
Linear Time Invariant (LTI) Systems are those systems in which the parameters , ,  and  are invariant with respect to time.