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  2. A440 (pitch standard) - Wikipedia

    en.wikipedia.org/wiki/A440_(pitch_standard)

    In the period instrument movement, a consensus has arisen around a modern baroque pitch of 415 Hz (with 440 Hz corresponding to A ♯), a 'baroque' pitch for some special church music (in particular, some German church music, e.g. the pre-Leipzig period cantatas of Bach) [10] known as Chorton pitch at 466 Hz (with 440 Hz corresponding to A ...

  3. Concert pitch - Wikipedia

    en.wikipedia.org/wiki/Concert_pitch

    ] A = 440 Hz. In practice most orchestras tune to a note given out by the oboe, and most oboists use an electronic tuning device when playing the tuning note. Some orchestras tune using an electronic tone generator. [25]

  4. Frequency modulation synthesis - Wikipedia

    en.wikipedia.org/wiki/Frequency_modulation_synthesis

    A 220 Hz carrier tone f c modulated by a 440 Hz modulating tone f m, with various choices of frequency modulation index, β. The time domain signals are illustrated above, and the corresponding spectra are shown below (spectrum amplitudes in dB). Waveforms for each β. Spectra for each β

  5. Tuning fork - Wikipedia

    en.wikipedia.org/wiki/Tuning_fork

    Motion of an A-440 tuning fork (greatly exaggerated) vibrating in its principal mode A tuning fork is a fork-shaped acoustic resonator used in many applications to produce a fixed tone. The main reason for using the fork shape is that, unlike many other types of resonators, it produces a very pure tone , with most of the vibrational energy at ...

  6. Precise tone plan - Wikipedia

    en.wikipedia.org/wiki/Precise_tone_plan

    All signals in the specification use combination (by addition) of audible tones of four frequencies: 350 Hz, 440 Hz, 480 Hz, and 620 Hz. Equipment is required to maintain tolerances within ± 0.5% in frequency and ±1.5 dB in amplitude stability. Harmonic distortion is to be at least 30 dB below the applied tone level. [1] The tones are as ...

  7. Shepard tone - Wikipedia

    en.wikipedia.org/wiki/Shepard_tone

    Shepard tone as of the root note A (A 4 = 440 Hz) Shepard scale, diatonic in C Major, repeated 5 times. As a conceptual example of an ascending Shepard scale, the first tone could be an almost inaudible C 4 and a loud C 5 (an octave higher).

  8. Western concert flute - Wikipedia

    en.wikipedia.org/wiki/Western_concert_flute

    Although the standard concert pitch today is A 4 = 440 Hz, many manufacturers optimize the tone hole size/spacings for higher pitch ... and Van der Graaf Generator. ...

  9. Undertone series - Wikipedia

    en.wikipedia.org/wiki/Undertone_series

    For example, if the fundamental frequency of an oscillator is 440 Hz, sub-harmonics include 220 Hz (1 ⁄ 2), ~146.6 Hz (1 ⁄ 3) and 110 Hz (1 ⁄ 4). Thus, they are a mirror image of the harmonic series , the overtone series.

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