<prompt> Passage: The 59.94 kiwango ni inayotokana na mahesabu yafuatayo. wabunifu alichagua kufanya chrominance subcarrier frequency n 0.5 mara ya mstari frequency ili kupunguza kuingiliwa kati ya luminance ishara na chrominance ishara. Njia nyingine hii ni mara nyingi alisema ni kwamba rangi subcarrier frequency ni odd mara ya nusu ya mstari frequency. Kisha alichagua kufanya sauti subcarrier frequency integer mara ya mstari frequency ili kupunguza inayoonekana intermodulation kuingiliwa kati ya sauti ishara na chrominance ishara. awali nyeusi-na-nyeupe kiwango, na yake 15.750 Hz mstari frequency na 4.5 MHz audio subcarrier, haina kukidhi mahitaji haya, hivyo wabunifu alikuwa na kuongeza ama sauti subcarrier frequency au mstari wa chini. Kuongeza mzunguko mzunguko wa sauti subcarrier frequency kuzuia nyeusi na nusu line frequency.  <response>: 59.94 