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  2. Orders of magnitude (frequency) - Wikipedia

    en.wikipedia.org/.../Orders_of_magnitude_(frequency)

    1 hertz (Hz) 1 to 1.66 Hz: Approximate frequency of an adult human's resting heart beat: 1 Hz: 60 bpm, common tempo in music 2 Hz: 120 bpm, common tempo in music ~7.83 Hz: Fundamental frequency of the Schumann resonances: 10 1: 10 hertz 10 Hz: Cyclic rate of a typical automobile engine at idle (equivalent to 600 rpm) 12 Hz

  3. Crystal oscillator frequencies - Wikipedia

    en.wikipedia.org/wiki/Crystal_oscillator_frequencies

    2 19 allows binary division to 1 Hz and 32.768 kHz. 1.000 10 6 allows decade division to 1 Hz and 1 kHz. Reference frequency. Common standard frequency. Harmonics fall on integer MHz frequencies. 1.048576 2 20 allows binary division to 1 Hz and 32.768 kHz. Real-time clock. 1.008 1200

  4. WSPR (amateur radio software) - Wikipedia

    en.wikipedia.org/wiki/WSPR_(amateur_radio_software)

    Modulation is continuous phase 4 FSK, with 1.4648 Hz tone separation. An Agilent Modulation Domain Analyzer 53310A showing the narrow band 4-FSK signal produced by a Raspberry Pi. Occupied bandwidth is about 6 Hz; Synchronization is via a 162 bit pseudo-random sync vector. Each channel symbol conveys one sync bit (LSB) and one data bit (MSB).

  5. Harmonic - Wikipedia

    en.wikipedia.org/wiki/Harmonic

    6 000 Hz: 386.3 ¢ Play ⓘ 11 th: lesser undecimal tritone, undecimal semi-augmented fourth: 3 · P 8 + A 4: 6 600 Hz: 551.3 ¢ Play ⓘ 12 th: perfect fifth: 3 · P 8 + P 5 7 200 Hz: 702.0 ¢ Play ⓘ 13 th: tridecimal neutral sixth: 3 · P 8 + n 6 ↓: 7 800 Hz: 840.5 ¢ Play ⓘ 14 th: harmonic seventh, septimal minor seventh (‘the lost ...

  6. Undertone series - Wikipedia

    en.wikipedia.org/wiki/Undertone_series

    Subharmonic frequencies are frequencies below the fundamental frequency of an oscillator in a ratio of 1/ n, with n a positive integer. 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).

  7. Beat (acoustics) - Wikipedia

    en.wikipedia.org/wiki/Beat_(acoustics)

    For example, if a 530 Hz pure tone is presented to a subject's right ear, while a 520 Hz pure tone is presented to the subject's left ear, the listener will hear beating at a rate of 10 Hz, just as if the two tones were presented monaurally, but the beating will have an element of lateral motion as well.

  8. The 6 Best High Frequency Wands for Zapping Acne and Wrinkles

    www.aol.com/6-best-high-frequency-wands...

    NuDerma High Frequency Skin Wand. This Amazon bestseller has racked up around 14,000 five-star ratings, a testament to its efficacy. Choose between four different tubes depending on the area you ...

  9. Audio frequency - Wikipedia

    en.wikipedia.org/wiki/Audio_frequency

    An audio frequency or audible frequency (AF) is a periodic vibration whose frequency is audible to the average human. The SI unit of frequency is the hertz (Hz). It is the property of sound that most determines pitch. [1] The generally accepted standard hearing range for humans is 20 to 20,000 Hz.