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  2. Octave band - Wikipedia

    en.wikipedia.org/wiki/Octave_band

    An octave band is a frequency band that spans one octave (Play ⓘ).In this context an octave can be a factor of 2 [1] [full citation needed] or a factor of 10 0.301. [2] [full citation needed] [3] [full citation needed] An octave of 1200 cents in musical pitch (a logarithmic unit) corresponds to a frequency ratio of ⁠ 2 / 1 ⁠ ≈ 10 0.301.

  3. 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]

  4. Octave - Wikipedia

    en.wikipedia.org/wiki/Octave

    An octave is the interval between one musical pitch and another with double or half its frequency. For example, if one note has a frequency of 440 Hz, the note one octave above is at 880 Hz, and the note one octave below is at 220 Hz. The ratio of frequencies of two notes an octave apart is therefore 2:1.

  5. Decade (log scale) - Wikipedia

    en.wikipedia.org/wiki/Decade_(log_scale)

    For example, an audio amplifier will usually have a frequency band ranging from 20 Hz to 20 kHz and representing the entire band using a decade log scale is very convenient. Typically the graph for such a representation would begin at 1 Hz (10 0 ) and go up to perhaps 100 kHz (10 5 ), to comfortably include the full audio band in a standard ...

  6. Five-limit tuning - Wikipedia

    en.wikipedia.org/wiki/Five-limit_tuning

    5-limit Tonnetz. Five-limit tuning, 5-limit tuning, or 5-prime-limit tuning (not to be confused with 5-odd-limit tuning), is any system for tuning a musical instrument that obtains the frequency of each note by multiplying the frequency of a given reference note (the base note) by products of integer powers of 2, 3, or 5 (prime numbers limited to 5 or lower), such as 2 −3 ·3 1 ·5 1 = 15/8.

  7. Where home prices are forecast to increase most in the coming ...

    www.aol.com/finance/where-home-prices-forecast...

    SmartAsset ranked 2,000 of the largest U.S. zip codes based on the projected average dollar increase in home prices between August 2024 and August 2025.

  8. Why Trump’s tariff plans could lead to higher interest rates

    www.aol.com/finance/why-trump-tariff-plans-could...

    President-elect Donald Trump’s promise to impose stiff tariffs against America’s three biggest trading partners is widely expected to push prices higher, which would set the stage for the ...

  9. Noise reduction coefficient - Wikipedia

    en.wikipedia.org/wiki/Noise_reduction_coefficient

    The noise reduction coefficient is "a single-number rating, rounded to the nearest 0.05, of the sound absorption coefficients of a material for the four one-third octave bands at 250 Hz, 500 Hz, 1000 Hz and 2000 Hz". [2]