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Although audio tapes and video tapes look different, they're based on the same principles.
盡管磁帶和錄像帶看起來(lái)不同,但二者都基于同樣的原理。
Each has a roll of magnetic material which slides past the so-called “playback head” in the VCR or cassette deck (cassette decks have one playback head, VCRs have two or more).
錄像機(jī)或盒式錄音機(jī)(盒式錄音機(jī)有一個(gè)放音磁頭,錄象機(jī)有兩個(gè)或更多)都有能夠滑過(guò)被稱為“放音磁頭”的磁性材料。
In both machines, these heads detect changes in magnetism as the tape moves by.
這兩種機(jī)器的磁頭都會(huì)隨著本身媒體的運(yùn)動(dòng)檢測(cè)磁性的變化。
The changing magnetic signal is translated into music on your tape deck, or both video and sound on your VCR.
磁信號(hào)的改變轉(zhuǎn)化為你錄音機(jī)中的音樂(lè),或錄像機(jī)的視頻和聲音。
Without a changing magnetic signal over a playback head, you'd get no sound, no picture.
如果放音磁頭沒(méi)有磁信號(hào)的變化,你就得不到聲音和圖像。
