Influence of Image Spread on Sound Film Performance
The control of image spread is crucial for the quality of sound reproduction with motion picture films. This paper will describe the performance of systems in which films with different image-spread characteristics use Improved Kodak Panchromatic Sound Recording Film 2374. Image spread induces distortion (linear and nonlinear) of the analog-recorded signals and blur on the digital-recorded patches. This drawback is overcome in the sound transfer house by cancellation of the effect of image spread in the negative film with the appropriate image spread in the printed film. The topics of this paper are related to the optical transfer and printing operations in the lab. The impact of the light spread on the sound film performance will be presented. Graphs and measurements will allow comparison of the impact on a relatively high image-spread negative film (Kodak Panchromatic Sound Recording Film 2374) and a low-spread negative film (Improved Kodak Panchromatic Sound Recording Film 2374) on cross-modulation, signal-to-noise ratio (SNR), frequency response (relative to analog sound reproduction), and digital quality metrics (Dolby DQI, Sony SDDS rating).
- Print ISSN
- 1545-0279
- Electronic ISSN
- 2160-2492
- Published
- 2004-05
- Content type
- Original Research
- DOI
- 10.5594/J16284