在上一期的月刊中簡介了STIPA,在大家對STIPA有了初步的認識後,接著要來探討的是如何實際測量STIPA。
STIPA的量測與準備
STIPA量測分兩類,一類是設備播放,在聽眾聽音位置進行量測。如果設備只做訊號源播放,可以採取此手法;一類是鍊路測試,透過麥克風拾音後進行擴音,在聽眾聽音位置進行量測。如果有設置麥克風的廣播系統,則應採取此手法,以反應麥克風的拾音頻率響應與音響前級的放大能力。這樣的測試要將一個標準發聲喇叭置放於麥克風前0.5m處,讓麥克風進行拾音,因此在測試上必須準備如下的設備:
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