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  2. Piano key frequencies - Wikipedia

    en.wikipedia.org/wiki/Piano_key_frequencies

    This is a list of the fundamental frequencies in hertz (cycles per second) of the keys of a modern 88-key standard or 108-key extended piano in twelve-tone equal temperament, with the 49th key, the fifth A (called A 4), tuned to 440 Hz (referred to as A440). [1] [2] Every octave is made of twelve steps called semitones.

  3. Audio frequency - Wikipedia

    en.wikipedia.org/wiki/Audio_frequency

    In general, frequency components of a sound determine its "color", its timbre. When speaking about the frequency (in singular) of a sound, it means the property that most determines its pitch. [6] Higher pitches have higher frequency, and lower pitches are lower frequency. The frequencies an ear can hear are limited to a specific range of ...

  4. Bark scale - Wikipedia

    en.wikipedia.org/wiki/Bark_scale

    A440 Play ⓘ. 440 Hz = 4.21 or 4.39. The Bark scale is a psychoacoustical scale proposed by Eberhard Zwicker in 1961. It is named after Heinrich Barkhausen, who proposed the first subjective measurements of loudness. [1]

  5. IPA consonant chart with audio - Wikipedia

    en.wikipedia.org/wiki/IPA_consonant_chart_with_audio

    The following are the non-pulmonic consonants.They are sounds whose airflow is not dependent on the lungs. These include clicks (found in the Khoisan languages and some neighboring Bantu languages of Africa), implosives (found in languages such as Sindhi, Hausa, Swahili and Vietnamese), and ejectives (found in many Amerindian and Caucasian languages).

  6. Harmonic series (music) - Wikipedia

    en.wikipedia.org/wiki/Harmonic_series_(music)

    The fourth harmonic vibrates at four times the frequency of the fundamental and sounds a perfect fourth above the third harmonic (two octaves above the fundamental). Double the harmonic number means double the frequency (which sounds an octave higher). An illustration in musical notation of the harmonic series (on C) up to the 20th harmonic.

  7. Audiogram - Wikipedia

    en.wikipedia.org/wiki/Audiogram

    An audiogram is a graph that shows the audible threshold for standardized frequencies as measured by an audiometer. The Y axis represents intensity measured in decibels (dB) and the X axis represents frequency measured in hertz (Hz). [1] The threshold of hearing is plotted relative to a standardised curve that represents 'normal' hearing, in dB ...

  8. International Phonetic Alphabet chart - Wikipedia

    en.wikipedia.org/wiki/International_Phonetic...

    The following is the chart of the International Phonetic Alphabet, a standardized system of phonetic symbols devised and maintained by the International Phonetic Association. It is not a complete list of all possible speech sounds in the world's languages, only those about which stand-alone articles exist in this encyclopedia.

  9. Template:Sound measurements - Wikipedia

    en.wikipedia.org/wiki/Template:Sound_measurements

    Sound pressure p, SPL, L PA Particle velocity v, SVL Particle displacement δ Sound intensity I, SIL Sound power P, SWL, L WA Sound energy W Sound energy density w Sound exposure E, SEL Acoustic impedance Z Audio frequency AF Transmission loss TL

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