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  2. Reference tone - Wikipedia

    en.wikipedia.org/wiki/Reference_tone

    In telecommunication, a standard test tone is a pure tone with a standardized level generally used for level alignment of single links and of links in tandem. [1]For standardized test signal levels and frequencies, see MIL-STD-188-100 for United States Department of Defense (DOD) use, and the Code of Federal Regulations Title 47, part 68 for other Government agencies.

  3. Hypersonic effect - Wikipedia

    en.wikipedia.org/wiki/Hypersonic_effect

    System non-linearities (present to varying degrees in all audio reproduction electronics, loudspeakers, etc.) are known to produce lower-frequency intermodulation products when the system is stimulated with high frequency signals. It is suggested that this mechanism could produce signals in the audible range that allow listeners to distinguish ...

  4. Treble (sound) - Wikipedia

    en.wikipedia.org/wiki/Treble_(sound)

    In music, this corresponds to high notes. The treble clef is often used to notate such notes. [2] Treble sound is the counterpart to bass sound. Examples of treble sounds include soprano voices, flute tones, and piccolos. The term treble derives from the Latin triplum, used in 13th century motets to indicate the third and highest range.

  5. Tone - Wikipedia

    en.wikipedia.org/wiki/Tone

    Pure tone, a tone with a sinusoidal waveform; Reciting tone, such as Psalm tone and recitative, as in Gregorian chants; Tonality, a system of music based on a key "center", or tonic; Tone control, a (typically electronic) control for affecting frequency content of an audio signal; Whole tone, or major second, a commonly occurring musical interval

  6. Timbre - Wikipedia

    en.wikipedia.org/wiki/Timbre

    Spectrogram of the first second of an E9 suspended chord played on a Fender Stratocaster guitar. Below is the E9 suspended chord audio: In music, timbre (/ ˈ t æ m b ər, ˈ t ɪ m-, ˈ t æ̃-/), also known as tone color or tone quality (from psychoacoustics), is the perceived sound quality of a musical note, sound or tone.

  7. Call-progress tone - Wikipedia

    en.wikipedia.org/wiki/Call-progress_tone

    The high frequencies may be the same volume as – or louder than – the low frequencies when sent across the line. The loudness difference between the high and low frequencies can be as large as 3 decibels (dB) and is referred to as "twist." The duration of the tone should be at least 537 ms. [1]

  8. Inharmonicity - Wikipedia

    en.wikipedia.org/wiki/Inharmonicity

    For instance, a stiff string under low tension (such as those found in the bass notes of small upright pianos) exhibits a high degree of inharmonicity, while a thinner string under higher tension (such as a treble string in a piano) or a more flexible string (such as a gut or nylon string used on a guitar or harp) will exhibit less inharmonicity.

  9. Equal-loudness contour - Wikipedia

    en.wikipedia.org/wiki/Equal-loudness_contour

    An equal-loudness contour is a measure of sound pressure level, over the frequency spectrum, for which a listener perceives a constant loudness when presented with pure steady tones. [1] The unit of measurement for loudness levels is the phon and is arrived at by reference to equal-loudness contours. By definition, two sine waves of differing ...

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