straight-line portion of the negative H & D curve, the print being made on the straight-line portion of the print H & D curve. Light valve recording followed the basic principles of rendering tone values laid down by L.

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• Surround sound
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• Audio engineering
• Noise reduction
• Sound-on-film
• Fantasound
• Stereophonic sound
• Sound recording and reproduction
• Gramophone record
• Waves
• Film
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