SMPTE EG 9-2005 Audio Recording Reference Level for Post-Production of Motion-Picture Related Materials《电影相关材料后期制作的音频录制参考等级》.pdf
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1、 1 Scope This guideline specifies the audio recording reference level for intra- and inter-studio operations concerned with motion-picture post-production audio recording on both sprocketed and nonsprocketed analog and digital magnetic and photographic materials. 2 Normative reference The following
2、document contains provisions which, through reference in this text, constitutes provisions of this guideline. At the time of publication, the edition indicated was valid. All standards are subject to revision, and parties to agreements based on this guideline are encouraged to investigate the possib
3、ility of applying the most recent edition of the document indicated below. SMPTE RP 155-2004, Motion Picture and Television Reference Level for Digital Audio Systems 3 Specifications 3.1 The audio recording reference level shall be a sine wave of approximately 1 kHz. 3.2 For analog recording on magn
4、etic materials, the fluxivity of the reference level shall be 185 nWb/m. 3.3 For analog recording on photographic audio tracks, the reference level shall correspond to 50% maximum modulation. The maximum modulation width is 0.076 in (1.93 mm) for 35-mm monophonic sound tracks, 0.033 in (0.84 mm) for
5、 each track of 35-mm stereo sound tracks, and 0.060 in (1.52 mm) for 16-mm monophonic sound tracks. The condition of 100% modulation is commonly referred to as optical clash, and thus 50% modulation represents a level of approximately 6 dB below optical clash (see figure 1). 3.4 For digital recordin
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