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  2. Equal temperament - Wikipedia

    en.wikipedia.org/wiki/Equal_temperament

    12 tone equal temperament chromatic scale on C, one full octave ascending, notated only with sharps. Play ascending and descending ⓘ. An equal temperament is a musical temperament or tuning system that approximates just intervals by dividing an octave (or other interval) into steps such that the ratio of the frequencies of any adjacent pair of notes is the same.

  3. iPhone 12 - Wikipedia

    en.wikipedia.org/wiki/IPhone_12

    The iPhone 12 features a 6.1-inch (155 mm) display [33] with Super Retina XDR OLED technology at a resolution of 2532 × 1170 pixels and a pixel density of about 460 ppi. [34] The iPhone 12 Mini features a 5.4-inch (137 mm) display with the same technology at a resolution of 2340 × 1080 pixels, and a pixel density of about 476 ppi.

  4. Call-progress tone - Wikipedia

    en.wikipedia.org/wiki/Call-progress_tone

    The tone frequencies, as defined by the precise tone plan, are selected such that harmonics and intermodulation products will not cause an unreliable signal. No frequency is a multiple of another, the difference between any two frequencies does not equal any of the frequencies, and the sum of any two frequencies does not equal any of the ...

  5. Special information tone - Wikipedia

    en.wikipedia.org/wiki/Special_information_tone

    The third tone segment may be of long or short duration but is limited to the lower frequency state. Currently, the third tone segment has been assigned both a fixed long duration and a fixed lower frequency. This fixed assignment of the third tone provides a reference or calibration point for detection devices. [1] [2]

  6. Colors of noise - Wikipedia

    en.wikipedia.org/wiki/Colors_of_noise

    At high densities it sounds similar to white noise; however, it is perceptually "smoother". [12] The sparse nature of velvet noise allows for efficient time-domain convolution , making velvet noise particularly useful for applications where computational resources are limited, like real-time reverberation algorithms.

  7. Cost-plus pricing - Wikipedia

    en.wikipedia.org/wiki/Cost-plus_pricing

    Cost-plus pricing is a pricing strategy by which the selling price of a product is determined by adding a specific fixed percentage (a "markup") to the product's unit cost. Essentially, the markup percentage is a method of generating a particular desired rate of return.

  8. 72 equal temperament - Wikipedia

    en.wikipedia.org/wiki/72_equal_temperament

    12 EDO has a very good approximation for the perfect fifth (third harmonic), especially for such a small number of steps per octave, but compared to the equally-tempered versions in 12 EDO, the just major third (fifth harmonic) is off by about a sixth of a step, the seventh harmonic is off by about a third of a step, and the eleventh harmonic ...

  9. DTMF - Wikipedia

    en.wikipedia.org/wiki/DTMF

    The commonly used keypad has four rows and three columns, but a fourth column is present for some applications. Pressing a key sends a combination of the row and column frequencies. For example, the 1 key produces a superimposition of a 697 Hz low tone and a 1209 Hz high tone. Initial pushbutton designs employed levers, enabling each button to ...