| 摘要 |
Optical sound reproduction method and apparatus are provided for use with motion picture film having an optical dye sound track. The sound track preferentially modulates visible radiation while the silicon photoreceptor incorporated in the sound reproduction apparatus preferentially responds to infrared radiation. By positioning a suitable energy conversion device between the sound track and the photoreceptor, the modulated visible radiation-prior to striking the photoreceptor-is transduced into modulated radiation of longer wavelength nearer to the infrared portion of the spectrum. The signal provided by the photoreceptor is correspondingly enhanced since the impinging radiation has been shifted in wavelength toward the preferential response region of the photoreceptor. One suitable energy convertor is a fluorescing layer that absorbs visible radiation and emits radiation of longer wavelength in response thereto.
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