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2. Noise reduction - Wikipedia

   en.wikipedia.org/wiki/Noise_reduction

   Noise reduction is the process of removing noise from a signal. Noise reduction techniques exist for audio and images. Noise reduction algorithms may distort the signal to some degree. Noise rejection is the ability of a circuit to isolate an undesired signal component from the desired signal component, as with common-mode rejection ratio. All signal processing devices, both analog and digital ...

3. Background music - Wikipedia

   en.wikipedia.org/wiki/Background_music

   Background music is commonly played where there is no audience at all, such as empty hallways, restrooms and fitting rooms. It is also used in artificial space, such as music played while on hold during a telephone call, and virtual space, as in the ambient sounds or thematic music in video games. It is typically played at low volumes from ...

4. Audio restoration - Wikipedia

   en.wikipedia.org/wiki/Audio_restoration

   Audio restoration. Audio restoration is the process of removing imperfections (such as hiss, impulse noise, crackle, wow and flutter, background noise, and mains hum) from sound recordings. Audio restoration can be performed directly on the recording medium (for example, washing a gramophone record with a cleansing solution), or on a digital ...

5. Seeburg 1000 - Wikipedia

   en.wikipedia.org/wiki/Seeburg_1000

   Seeburg 1000. The Seeburg 1000 Background Music System is a phonograph designed and built by the Seeburg Corporation to play background music from special 16 2⁄3 RPM vinyl records in offices, restaurants, retail businesses, factories and similar locations. Seeburg provided a service similar to that of Muzak.

6. Equalization (audio) - Wikipedia

   en.wikipedia.org/wiki/Equalization_(audio)

   Equalization, or simply EQ, in sound recording and reproduction is the process of adjusting the volume of different frequency bands within an audio signal. The circuit or equipment used to achieve this is called an equalizer. [1][2] Most hi-fi equipment uses relatively simple filters to make bass and treble adjustments.

7. Dolby noise-reduction system - Wikipedia

   en.wikipedia.org/wiki/Dolby_noise-reduction_system

   The widespread proliferation of digital audio in professional and consumer applications (e.g., compact discs, music download, music streaming) has made analog audio production less prevalent and therefore changed Dolby's focus on Dolby Vision, but Dolby's analog noise reduction systems are still widely used in niche analog production ...