Dolby Noise Reduction is a device that eliminates high frequency noise from tape during recording. Before recording, the high-frequency part of the sound signal is boosted by 12dB (pre-emphasis) and then recorded on the tape. When sound is played, the sound signal picked up on the tape is attenuated by 12dB, effectively reducing high-frequency noise. Increased high-frequency signal-to-noise ratio and improved audio fidelity.
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