Cinematography - common to more than one film gauge - sound - method for measurement of the signal to noise ratio of 8 mm type , 16 mm and 35 mm variable area photographic sound records 电影技术.第5部分:多种胶片宽度的通用部分.第4节:伴音.第6小节:在8mm s型16mm 35mm可变面摄影录音信噪比测量方法