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  2. Noise reduction - Wikipedia

    en.wikipedia.org/wiki/Noise_reduction

    In particular, when recording quiet parts of an audio signal, the frequencies above 1 kHz would be boosted. This had the effect of increasing the signal-to-noise ratio on tape up to 10 dB depending on the initial signal volume. When it was played back, the decoder reversed the process, in effect reducing the noise level by up to 10 dB.

  3. Sound masking - Wikipedia

    en.wikipedia.org/wiki/Sound_masking

    Sound masking is the inclusion of generated sound (commonly, though inaccurately, referred to as "white noise" or "pink noise") into an environment to mask unwanted sound. It relies on auditory masking. Sound masking is not a form of active noise control (noise cancellation technique); however, it can reduce or eliminate the perception of sound ...

  4. Tape hiss - Wikipedia

    en.wikipedia.org/wiki/Tape_hiss

    A 3 dB improvement of the signal to noise ratio occurs for every doubling of the track width. [1] A number of noise reduction techniques can be used to reduce the impact of tape hiss, including Dolby NR and DBX, or, in the case of videotape recording, frequency modulation of either the composite video signal, or the luma component.

  5. Dolby noise-reduction system - Wikipedia

    en.wikipedia.org/wiki/Dolby_noise-reduction_system

    A Dolby noise-reduction system, or Dolby NR, is one of a series of noise reduction systems developed by Dolby Laboratories for use in analog audio tape recording. [1] The first was Dolby A, a professional broadband noise reduction system for recording studios that was first demonstrated in 1965, but the best-known is Dolby B (introduced in 1968), a sliding band system for the consumer market ...

  6. dbx (noise reduction) - Wikipedia

    en.wikipedia.org/wiki/Dbx_(noise_reduction)

    The logo represents both the company and its noise reduction system. dbx is a family of noise reduction systems developed by the company of the same name.The most common implementations are dbx Type I and dbx Type II for analog tape recording and, less commonly, vinyl LPs.

  7. 8 white noise machines for better sleep - AOL

    www.aol.com/news/8-white-noise-machines-better...

    This simple white noise machine offers ten fan sounds and ten ambient noise variations (including white, pink and brown noise). It is powered by either AC or USB and you can adjust the volume with ...

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