Dolby noise-reduction system | recording | Britannica (original) (raw)
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magnetic recording systems
In sound recording: The audiotape …most prevalent of which is Dolby noise reduction. In the Dolby system the higher-frequency components of a sound wave are amplified before the signal is impressed on the tape so that their amplitudes are well above the amplitude of the tape hiss. On playback, the high frequencies are attenuated after… Read More
motion pictures
In motion-picture technology: Mixing …of noise reduction such as Dolby Type A. The Dolby system works by responding to changing amplitudes in various regions of the frequency spectrum of an audio signal. The quieter passages are boosted to increase the spread between the signal (desired sound) and the unwanted ground noise. When played back,… Read More
In motion-picture technology: Sound reproduction …area (SVA), popularly known as Dolby, though in fact made by several manufacturers, employs a split optical pickup for two sets of wires for the left and right channels. Three stage speakers (left, right, and centre) are mounted behind the screen, and an array of speakers is spread along the… Read More
