电影录音有磁性录音和光学录音。磁性录音是把声音记录在磁带上,录音后即可听到声音,如质量不好,可消磁再录。而光学录音是把声音记录在胶片上,必须经过洗印后,才能知道声带的质量,如不合格,这条胶片就报废。所以现在制片厂的同期录音、前期录音、后期配音和混合录音都采用磁性录音,而只有在双片(画面工作样片和混录磁带)审查通过后,才把混录磁带上的声音转录到光学声 Film recording magnetic recording and optical recording. Magnetic recording is the sound recorded on the tape, the sound can be heard after recording, such as poor quality, degaussing and then recorded. The optical recording is the sound recorded on the film, must be washed, to know the quality of the vocal cords, such as failure, this film scrapped. So now studio simultaneous recording, pre-recording, post-dubbing and mixed recording use magnetic recording, and only in the two-piece (screen work sample and mixed tape) review after the transcription of the tape audio to Optical sound