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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 approximately 261.63 Hz, [1] making it approximately 31.77 cents lower than the common A440 pitch standard.
Psychoacoustics is the branch of psychophysics involving the scientific study of the perception of sound by the human auditory system.It is the branch of science studying the psychological responses associated with sound including noise, speech, and music.
Frequency is an important parameter used in science and engineering to specify the rate of oscillatory and vibratory phenomena, such as mechanical vibrations, audio signals , radio waves, and light. For example, if a heart beats at a frequency of 120 times per minute (2 hertz), the period—the time interval between beats—is half a second (60 ...
They can hear higher-pitched sounds than humans or most dogs, detecting frequencies from 55 Hz up to 79 kHz. [17] [18] Cats do not use this ability to hear ultrasound for communication but it is probably important in hunting, [19] since many species of rodents make ultrasonic calls. [20]
Numerous other studies have contradicted the portion of the results relating to the subjective reaction to high-frequency audio, finding that people who have "good ears" [8] listening to Super Audio CDs and high resolution DVD-Audio recordings [9] on high fidelity systems capable of reproducing sounds up to 30 kHz [10] cannot tell the ...
Also, frequencies of 30 Hz and below can be produced by and are important in the study of certain stellar nebulae [4] and frequencies as high as 2.9 × 10 27 Hz have been detected from astrophysical sources. [5]
For frequencies below 10 Hz, the pigeon threshold is at about 55 dB which is at least 50 dB more sensitive than humans. [4] Pigeons are able to discriminate small frequency differences in sounds at between 1 Hz and 20 Hz, with sensitivity ranging from a 1% shift at 20 Hz to a 7% shift at 1 Hz. [14]
The wavelength of a sound is the distance between any two consecutive matching points on the waveform. The audible frequency range for young humans is about 20 Hz to 20 kHz. Hearing of higher frequencies decreases with age, limiting to about 16 kHz for adults, and even down to 3 kHz for elders. [citation needed]