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本文首先讨论了矩阵编码立体声与分立多声道数字立体声的区别,实现多声道数字声是大画面电影院音响的必由之路。在北京电影制片厂为进行“Dolby Digital电影数字声的制作,对一系列的录音工艺流程进行了改造,包括:在混合录音棚安装了AC3数码流编码的磁—光盘(MO DISC)母版制作系统;在光学录音室对原光学录间机进行改造,安装数字声带转录适配器,使用磁—光盘母版在光学声负片上同时记录模拟SR声迹及Dolby Digital数码声迹;最后在洗印部门改造了印片机用以印制可供影院放映和还音的拷贝正片并进行数码声带的质量检验。文章叙述了上述工艺技术改造的具体方案及工作原理,并在最后介绍了AC3电影数码声的还音原理。
This article first discusses the difference between matrix encoded stereo and discrete multichannel digital stereo, and the realization of multichannel digital sound is the only way of large-screen cinema sound. A series of recording processes were modified at the Beijing Film Studio to produce ”Dolby Digital" movie digital sound including the installation of an AC3 digital stream encoded magneto-optical disc (MO DISC) in a hybrid recording studio Version of the production system; in the optical studio to transform the original optical recording machine, install the digital vocal transcription adapter, the use of magnetic - optical master on the optical sound and negative while recording analog SR soundtrack and Dolby Digital digital soundtrack; and finally in the printing The department modified the printer to print positive copies for cinema screening and sound reproduction, and carried out quality inspection of digital vocal cords.The article described the specific solutions and working principles of the above-mentioned technological transformation, and at the end introduced the AC3 film digital The sound of sound theory.