What is the highest pitch audible to humans?
1414524#6
In 1959, Harman Kardon marketed the Citation II, an early ultra wideband stereophonic tube amplifier. Designed by Stewart Hegeman, it featured 60 watts/channel output with a frequency response of 18-60,000 Hz at 20 watt output. The company promoted their philosophy of designing high fidelity sound using amplifiers that provided widest possible audio bandwidth. Although the human ear highest audible range is around 20,000 Hz, the full range of sound goes beyond that with harmonics and overtones that may be beyond the hearing range of the human ear. These harmonics interact with other frequencies to produce audible secondary sounds or interference. Harman Kardon promoted the design in audio magazines and product brochures.
Harman Kardon
1043937#10
Using scientific pitch notation consistently, the MIDI NoteOn message assigns MIDI note 0 to C (five octaves below C or Middle C; lowest note on the two largest organs of the world; about one octave below the human hearing threshold: its overtones, however, are audible), MIDI note 21 to A (the bottom key of an 88-key piano), MIDI note 60 to C (Middle C), MIDI note 69 to A (A440), MIDI note 108 to C (the top key of an 88-key piano), and MIDI note 127 to G (beyond the piano; one octave above the highest note on some keyboard glockenspiels; some notes above the highest-pitched organ pipes).
Scientific pitch notation
44673348#4
If only one virtual pitch is perceived in a sound, it is generally the one with the highest salience. The output of Terhardt’s algorithm for pitch perception is a series of virtual pitches of differing salience, of which the most salient is the prediction for “the” pitch of the sound. The existence of several competing virtual pitches can explain the ambiguity of the pitch of many sounds. Bells with non-harmonic spectra are an obvious example (it is often possible to hear the main virtual pitch as the strike tone at the start of the sound, and the main spectral pitch as a hum tone which becomes directly audible as the sound dies away). But Terhardt and his colleagues also demonstrated that regular harmonic complex tones in speech and music are slightly ambiguous in pitch, which may be the ultimate origin of octave equivalence in music and the perceived tonal affinity of successive tones at octave or fifth intervals. 
Terhardt claimed that the root of a chord in western music typically corresponds to its most salient virtual pitch, and that the virtual pitch phenomenon is the ultimate origin of the root effect. He also investigated the perception of roughness in music and claimed that musical consonance and dissonance has two main psychoacoustic components, roughness and harmony, harmony being related to the perception of virtual pitch.
Ernst Terhardt
325480#5
According to Guinness World Records, the highest pitch human whistle ever recorded was measured at 4,186 Hz, which corresponds to a C8 musical note. This was done by Michael Stuart in Richmond, Virginia, on January 11, 2016. The lowest pitch whistle ever recorded was measured at 174.6 Hz, which corresponds to a F3 musical note. This was accomplished by Jennifer Davies of Dachau, Germany on November 6, 2005. The most people whistling simultaneously was 853, which was organized at the Spring Harvest event at Minehead, UK on April 11, 2014.
Whistling
2927047#7
The AY-3-8910 generates tones with base frequencies of up to 125 kHz (4 MHz input clock, or 8 MHz with the YM2149F), well beyond human perception and into the ultrasonic range. The existence of ultrasonic values is a consequence of the frequency-divider design; in order to have adequate resolution at audible frequencies it is necessary for the overall clock rate (and thus the output at small divisors) to be considerably higher than the audible range. Only divisors below 5 give entirely-ultrasonic output frequencies. Frequencies equivalent to the top octave of a piano keyboard can be defined with reasonable accuracy versus the accepted note values for the even-tempered scale, to nearly 1 Hz precision in the A440 range and even more finely at lower pitches. Despite the high maximum frequency, the ability to divide that figure by 4096 means the lowest directly definable output frequency is 30.6 Hz, roughly equal to B0, the third lowest note on a normal 88-key piano, and as good as subsonic with everyday speaker systems. In essence, the chip is able to produce decently musical output at all reasonable pitches found in most compositions.
General Instrument AY-3-8910
3486639#0
Georgia Brown, pseudonym of Rossana Monti (born June 29, 1980) is an Italian Brazilian singer noted for her extensive vocal range. She was listed in the 2005 "Guinness World Records" for hitting the highest vocal note and for possessing the greatest vocal range for a female, claimed to be exactly nine octaves from sub>-E1-G10 using scientific pitch notation. However, as of 2013, Tim Storms holds the record for the widest vocal range of any human with 10 octaves, with the caveat that much of Storms's vocal range is infrasound that cannot be heard and that all of Brown's range is within the range of the human ear.
Georgia Brown (Brazilian singer)
29684907#19
Alburquerque is a three-pitch pitcher. He throws a hard four-seam fastball that ranges between 94–98 mph, and his "out pitch" is a downward-breaking slider that ranges between 85–88 mph. The slider is his most common pitch, especially with two strikes in the count; it has a 60% whiff rate, the fifth-highest for a slider among relief pitchers since the 2007 season.
His best pitch is what scouts call the "Cross Curve" that "breaks this way, and then that way."
His strikeouts per 9 innings pitched ratio is above the league average, sitting at 10.7 through the end of the 2017 season. He also has a high walk rate at 5.0 per 9 innings. Alburquerque was effective in the 2011 season at stranding inherited baserunners, allowing only 3 of 31 to score.
Al Alburquerque
42708186#0
"" (K. 316/300b) is a recitative and aria for soprano and orchestra that Wolfgang Amadeus Mozart wrote for Aloysia Weber. It is famous for including two occurrences of a G, i.e. the G above high C, or 1568 Hz by modern concert pitch – according to the "Guinness Book of Records", the highest musical note ever scored for the human voice. (However, an A is scored in Ignaz Umlauf's "Das Irrlicht", also sung by Aloysia Weber.)
Popoli di Tessaglia!
10567426#43
The lowest audible SPL for a human diver with normal hearing is about 67 dB re 1 μPa, with greatest sensitivity occurring at frequencies around 1 kHz. This corresponds to a sound intensity 5.4 dB, or 3.5 times, higher than the threshold in air (see Measurements above).
Underwater acoustics
201605#15
There has been an industry trend towards sampling rates well beyond the basic requirements: such as 96 kHz and even 192 kHz This is in contrast with laboratory experiments, which have failed to show that ultrasonic frequencies are audible to human observers. In fact, in some cases, ultrasonic sounds do interact with and modulate the audible part of the frequency spectrum (intermodulation distortion), "degrading" the fidelity. One advantage of higher sampling rates is that they can relax the low-pass filter design requirements for ADCs and DACs, but with modern oversampling sigma-delta converters this advantage is less important.
Sampling (signal processing)