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2. Scientific pitch - Wikipedia

   en.wikipedia.org/wiki/Scientific_pitch

   Scientific pitch, also known as philosophical pitch, Sauveur pitch or Verdi tuning, is an absolute concert pitch standard which is based on middle C (C 4) being set to 256 Hz rather than ~ 261.63 Hz, [a] making it ~ 31.77 cents lower than the common A440 pitch standard.

3. Twenty Thousand Hertz - Wikipedia

   en.wikipedia.org/wiki/Twenty_Thousand_Hertz

   Following a Twenty Thousand Hertz episode about audio deepfakes, host Dallas Taylor was featured in a September 2020 segment of NPR's Here & Now, discussing the topic. [13] [14] Taylor was featured in a November 2020 episode of the Popular Science podcast The Weirdest Thing I Learned This Week, discussing the use of animals noises in sound ...

4. Mel scale - Wikipedia

   en.wikipedia.org/wiki/Mel_scale

   In 1976, Makhoul and Cosell published the now-popular version with the 700 Hz corner frequency. [11] As Ganchev et al. have observed, "The formulae [with 700], when compared to [Fant's with 1000], provide a closer approximation of the Mel scale for frequencies below 1000 Hz, at the price of higher inaccuracy for frequencies higher than 1000 Hz."

5. Audio therapy - Wikipedia

   en.wikipedia.org/wiki/Audio_Therapy

   Audio therapy is the clinical use of recorded sound, music, or spoken words, or a combination thereof, recorded on a physical medium such as a compact disc (CD), or a digital file, including those formatted as MP3, which patients or participants play on a suitable device, and to which they listen with intent to experience a subsequent beneficial physiological, psychological, or social effect.

6. Muladhara - Wikipedia

   en.wikipedia.org/wiki/Muladhara

   This chakra can also be activated by chanting the Seed-Mantra. It is said that one who chants the Seed Mantra of Muladhara Chakra for more than 100,000,000 times can attain all the Siddhis of the Muladhara Chakra. [citation needed] There are also special meditation practices for awakening the Mūlādhāra Chakra. [9]

7. Surat Shabd Yoga - Wikipedia

   en.wikipedia.org/wiki/Surat_Shabd_Yoga

   First is simran, or the repetition of Lord's holy names. It brings back our scattered attention to the tisra til - the third eye (behind our eyes), which is the headquarters of our mind and soul, in the waking state, whence it has scattered. Second is dhyan, or contemplation on the immortal form of the Master.

8. Audio frequency - Wikipedia

   en.wikipedia.org/wiki/Audio_frequency

   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. [2] [3] [4] In air at atmospheric pressure, these represent sound waves with wavelengths of 17 metres (56 ft) to 1.7 centimetres (0.67 in).

9. Harmonic series (music) - Wikipedia

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

   This objective structure is augmented by psychoacoustic phenomena. For example, a perfect fifth, say 200 and 300 Hz (cycles per second), causes a listener to perceive a combination tone of 100 Hz (the difference between 300 Hz and 200 Hz); that is, an octave below the lower (actual sounding) note. This 100 Hz first-order combination tone then ...