Fungsi sub-swara interkom nuduhake kontrol swara sing terus-terusan kanggo ngontrol sistem gangguan radian, sing umum dikenal minangka sub-audio, yaiku teknologi sing luwih saka frekuensi (67Hz-250.3Hz) sing luwih murah tinimbang audio. sinyal. Amarga sawetara frekuensi kurang saka audio standar, diarani sub-audio.
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