Infrasound, sometimes referred to as low frequency sound or subsonic, describes sound waves with a frequency below the lower limit of human audibility (generally 20 Hz, as defined by the ANSI/ASA S1.1-2013 standard). [1] .

infrasonics, vibrational or stress waves in elastic media, having a frequency below those of sound waves that can be detected by the human ear —i.e., below 20 hertz. The range of frequencies extends down to geologic vibrations that complete one cycle in 100 seconds or longer.

having or relating to a frequency below the audibility range of the human ear; utilizing or produced by infrasonic waves or vibrations… See the full definition

Infrasound, also known as low-frequency sound, refers to sound waves that have a frequency lower than the lower range of audibility (about 20 Hz). Because hearing becomes less sensitive as frequency decreases, the sound pressure should be reasonably large for …

2023年3月20日 · Infrasound refers to sound waves with frequencies below the human audible range of 20 Hz. These low-frequency sounds can range from 0.001 Hz to 20 Hz and travel long distances with little loss of energy. Unlike ultrasound, which is above the human hearing range, infrasound can be heard by some animals, including elephants, whales, and giraffes.

2007年1月1日 · Infrasound, in its popular definition as sound below a frequency of 20 Hz, is clearly audible, the hearing threshold having been measured down to 1.5 Hz. The popular concept that sound below 20 Hz is inaudible is not correct. Sources of infrasound are in the range from very low-frequency atmospheric fluctuations up into the lower audio frequencies.

2025年1月25日 · Infrasonic and ultrasonic sounds represent two ends of the sound frequency spectrum, each with unique characteristics and applications. Understanding these differences is crucial for various fields, including environmental monitoring, medical imaging, and …

The term "infrasonic" applied to sound refers to sound waves below the frequencies of audible sound, and nominally includes anything under 20 Hz. Sources of infrasound in nature include volcanoes, avalanches, earthquakes and meteorites.

2009年1月1日 · Infrasound is inaudible sound as it consists of frequencies lower than 20 Hz, i.e. the human hearing threshold. Low frequency acoustic signals were first discovered after the eruption of the Krakatoa (Indonesia) in 1883.

2024年6月27日 · What is Infrasonic? Infrasonic refers to sound waves that have frequencies below the range of human hearing, typically below 20 Hz. These low-frequency sound waves are often produced by natural phenomena such as earthquakes, thunderstorms, and ocean waves, as well as man-made sources like machinery, explosions, and aircraft.