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  2. Military Auxiliary Radio System - Wikipedia

    en.wikipedia.org/wiki/Military_Auxiliary_Radio...

    MARS establishes programs to create civilian interest, recruit qualified volunteers, and furnish training in military communications, techniques, and procedures. Every year, MARS conducts an appropriate military and amateur radio cross-band exercise as an integral part of the annual Armed Forces Day. They provide a reserve of personnel trained ...

  3. 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.

  4. User guide - Wikipedia

    en.wikipedia.org/wiki/User_guide

    User manuals and user guides for most non-trivial PC and browser software applications are book-like documents with contents similar to the above list. They may be distributed either in print or electronically. Some documents have a more fluid structure with many internal links. The Google Earth User Guide [4] is an example of this format.

  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. Optical sound - Wikipedia

    en.wikipedia.org/wiki/Optical_sound

    Unlike Phonofilm, this optical sound technology used a photoelectric process that captured audio waveforms generated by a vibrating mirror galvanometer, and was the first effective multitrack recording system, predating magnetic tape multitrack recorders by at least 20 years.

  7. Scientists used Mars' ambient noise to map the planet's ... - AOL

    www.aol.com/news/nasa-mars-insight-ambient-noise...

    Ambient noise data collected by the InSight lander's seismometer gives us a detailed look at what lies right underneath its surface. Scientists used Mars' ambient noise to map the planet's ...

  8. Tape hiss - Wikipedia

    en.wikipedia.org/wiki/Tape_hiss

    Tape hiss is the high frequency noise present on analogue magnetic tape recordings caused by the size of the magnetic particles used to make the tape. Effectively it is the noise floor of the recording medium. It can be reduced by the use of finer magnetic particles or by increasing the tape speed or the track width used by the recorder.

  9. Audio noise measurement - Wikipedia

    en.wikipedia.org/wiki/Audio_noise_measurement

    Microphones, amplifiers and recording systems all add some electronic noise to the signals passing through them, generally described as hum, buzz or hiss. All buildings have low-level magnetic and electrostatic fields in and around them emanating from mains supply wiring, and these can induce hum into signal paths, typically 50 Hz or 60 Hz (depending on the country's electrical supply standard ...