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2. Pythagorean tuning - Wikipedia

   en.wikipedia.org/wiki/Pythagorean_tuning

   The purpose of this adjustment is to move the 12 notes within a smaller range of frequency, namely within the interval between the base note D and the D above it (a note with twice its frequency). This interval is typically called the basic octave (on a piano keyboard, an octave has only 12 keys).

3. Electronic tuner - Wikipedia

   en.wikipedia.org/wiki/Electronic_tuner

   This disc rotates at a fixed specific speed, set by the user. Each disc rotation speed is set to a particular frequency of the desired note. If the note being played (and making the lamps behind the disc flash) is at exactly the same frequency as the spinning of the disc, then the disc appears to be static from the strobing effect.

4. Pythagorean interval - Wikipedia

   en.wikipedia.org/wiki/Pythagorean_interval

   In musical tuning theory, a Pythagorean interval is a musical interval with a frequency ratio equal to a power of two divided by a power of three, or vice versa. [1] For instance, the perfect fifth with ratio 3/2 (equivalent to 3 1 / 2 1 ) and the perfect fourth with ratio 4/3 (equivalent to 2 2 / 3 1 ) are Pythagorean intervals.

5. Frequency averaging - Wikipedia

   en.wikipedia.org/wiki/Frequency_averaging

   The musical note frequency calculation formula is used: F=(2^12/n)*440, where n equals the number of positive or negative steps away from the base note of A4(440 hertz) and F equals the frequency. The formula is used in calculating the frequency of each note in the piece. The values are then added together and divided by the number of notes.

6. Bear (app) - Wikipedia

   en.wikipedia.org/wiki/Bear_(app)

   It was released as free application, with an optional paid subscription, that unlocks more advanced features, e.g. note syncing and app themes. In the same year, the application received Apple's Mac App of the Year Award. [5] In 2017, support for the Apple Watch was added and Shiny Frog received an Apple Design Award for their work on Bear. [6] [7]

7. Pipe organ tuning - Wikipedia

   en.wikipedia.org/wiki/Pipe_organ_tuning

   For many years, there was no pitch standard across Europe. The frequency of a ′ (the standard note for tuning musical instruments), for example, could range from a ′ =392 Hz in parts of France to a ′ =465 Hz (Cornet-ton pitch) in parts of Germany. [1] [2] Organs were often tuned differently than ensembles, even within the same region or town.

8. Adjusted Peak Performance - Wikipedia

   en.wikipedia.org/wiki/Adjusted_Peak_Performance

   Adjusted Peak Performance (APP) is a metric introduced by the U.S. Department of Commerce's Bureau of Industry and Security (BIS) to more accurately predict the suitability of a computing system to complex computational problems, specifically those used in simulating nuclear weapons.

9. Octave (electronics) - Wikipedia

   en.wikipedia.org/wiki/Octave_(electronics)

   For example, the frequency one octave above 40 Hz is 80 Hz. The term is derived from the Western musical scale where an octave is a doubling in frequency. [note 1] Specification in terms of octaves is therefore common in audio electronics. Along with the decade, it is a unit used to describe frequency bands or frequency ratios. [1] [2]