For humans, hearing is normally limited to frequencies between about 12 Hz and 20,000 Hz (20 kHz), although these limits are not definite. Here we mention 10 sounds that are in some way or another bizarre and you might not have listened to them before or you might have listened but interpreted differently. [via smashinglist]
10. First Recording (1860)
Methods and media for sound recording are varied and have undergone significant changes between the first time sound was actually recorded for later playback until now. However American Scientists have found a record even before the Thomas Edison Invention. Thomas Edison wasn’t the first person to record sound. A Frenchman named Edouard-Leon Scott de Martinville actually did it earlier. He invented a device called the phonautograph, and, on April 9, 1860, recorded someone singing the words, “Au clair de la lune, Pierrot repondit.” But he never had any intention of playing it back. He just wanted to study the pattern the sound waves made on a sheet of paper blackened by the smoke of an oil lamp. A group of researchers found some of his old phonautograph papers and used a computer program to play the recording.
9. First recording On a Phonograph (1878)
The phonograph expanded on the principles of the phonoautograph. Perfected by Frank Lambert in 1878, the phonograph was a device with a cylinder covered with an impressionable material such as tin foil, lead, or wax on which a stylus etched grooves. The depth of the grooves made by the stylus corresponded to change in air pressure created by the original sound. The recording could be played back by tracing a needle through the groove and amplifying, through mechanical means, the resulting vibrations.
8. 18000 Hz Sine Wave
Download Here: 18000 Hz Sine Wave
Try hearing this sound. It is called “under 20s” sound as the elder’s can’t perceive it. It is a sine wave at 18,000 Hz (by comparison, a dog whistle sounds at 16,000 – 22,000 HZ – meaning a dog can hear this sound as well). This sound is used by some teenagers as a ring tone on their cellphone so that only they (and others of their age group ofcourse) can tell when the phone is ringing. It is also occasionally used in England to play very loud in areas that authorities don’t want teens to congregate in, as the noise annoys them.
The inner ear of the humans have a functional design to hear sounds in a range of a frequency. Hearing is not merely a function of ears but the oscillation amplitude is conducted to the brain. As people get older they lose the ability to hear higher pitched sounds. As people get older they lose the ability to hear higher pitched sounds – that is the reason that only young people can hear this sound – it is too high for most people over the age of 20.
7. Phantom Melodies
Some pieces of music consist of high-speed arpeggios or other repeating patterns, which change only subtly. If they’re played fast enough, the brain picks up on the occasional notes that change, and links them together to form a melody. The melody disappears if the piece is played slowly. At the higher speed, the changing notes linger in your perception long enough to be linked into a melody, but at the lower speeds they’re too widely separated.
6. The Blue Whale Sounds
Download Here: Blue Whale Sound
The blue whale is the loudest animal on Earth! This endangered mammal is also the largest animal that ever lived on Earth; it is larger than any of the giant dinosaurs were. The second-loudest animal on Earth is the Howler Monkey that lives in South American rain forests. Blue whales mostly emit very loud, highly structured, repetitive low-frequency rumbling sounds that can travel for many miles underwater. These songs may be used for communicating with other blue whales, especially in order to attract and find mates. hale calls are recorded by hydrophones, underwater detecting and recording devices.
The call of the blue whale reaches levels up to 188 decibels. This extraordinarily loud whistle can be heard for hundreds of miles underwater. Theoretical calculations by Roger Payne and Douglas Webb (from the 1970’s) predicted that the loudest whale sounds might be transmitted across an entire ocean. The blue whale is much louder than a jet, which reaches only 140 decibels! Human shouting is 70 decibels; sounds over 120 decibels are painful to human ears.
5. Alien Speech
In the past decade, a number of important discoveries indicate that habitable worlds may be much more prevalent than previously thought. Researchers have found life in very harsh environments on Earth, which expands the possible kinds of places where life might exist. In our solar system, scientists have discovered evidence of currently or previously existing large bodies of water, a key ingredient of life, on Mars and the moons of Jupiter. Astronomers also have begun to find planets outside our solar system, identifying approximately 90 stars with at least one planet orbiting them. Perhaps the notion that there’s something out there is closer to reality than we have imagined. Looks like aliens want to communicate. Watch the whole thing through in order to hear the alien speech.
4. Jupiter Sounds
From an original CD: JUPITER NASA-VOYAGER SPACE SOUNDS (1990) BRAIN/MIND Research (Source)
Fascinating recording of Jupiter sounds (electromagnetic “voices”) by NASA-Voyager. The complex interactions of charged electromagnetic particles from the solar wind , planetary magnetosphere etc. create vibration “soundscapes”. It sounds very interesting, even scary.
Jupiter is mostly composed of hydrogen and helium. The entire planet is made of gas, with no solid surface under the atmosphere. The pressures and temperatures deep in Jupiter are so high that gases form a gradual transition into liquids which are gradually compressed into a metallic “plasma” in which the molecules have been stripped of their outer electrons. The winds of Jupiter are a thousand metres per second relative to the rotating interior. Jupiter’s magnetic field is four thousand times stronger than Earth’s, and is tipped by 11° degrees of axis spin. This causes the magnetic field to wobble, which has a profound effect on trapped electronically charged particles. This plasma of charged particles is accelerated beyond the magnetosphere of Jupiter to speeds of tens of thousands of kilometres per second. It is these magnetic particle vibrations which generate some of the sound you hear on this recording.
3. Tunguska Meteor
The Tunguska Event, or Tunguska explosion, was a powerful explosion that occurred not far from the PodkamennayaTunguska River in what is now Krasnoyarsk Krai in Russia, at 0 hours 13 minutes 35 seconds Greenwich Mean Time on June 30, 1908. Although the cause of the explosion is the subject of debate, it is commonly believed to have been caused by the air burst of a large meteoroid or comet fragment at an altitude of 5–10 kilometres (3.1–6.2 mi) above the Earth’s surface. Estimates of the energy of the blast range from 5 megatons of TNT to as high as 30 megatons of TNT with a decibel rating 300-315 making it the loudest sound known in the history of earth.
2. Sounds of Hell
The “Well to Hell” is a borehole in the Soviet Union which was purportedly drilled so deep that it broke through to hell. This urban legend has been circulating on the Internet since at least 1997. It is first attested in English as a 1989 broadcast by Trinity Broadcasting Network, which had picked up the story from Finnish newspaper reports. The legend holds that some residents of Siberia (Russia) had drilled a hole that was nine miles (14.5 km) deep before breaking through to a cavity. Intrigued by this unexpected discovery, they lowered an extremely heat tolerant microphone, along with other sensory equipment, into the well. The temperature deep within was 2,000 °F (1,100 °C) — heat from a chamber of fire from which screams of the damned could be heard. This has gained great popularity on the internet and might have some basis in fact.
1. The Brown note that Causes you to Poo
The brown note is a theoretical infrasound frequency that would cause humans to lose control of their bowels due to resonance. During many shows on Science Channel, they broadcast the note over the air (and into the living rooms of viewers) in an attempt to cause bowel movements among those who had chosen to stay in the room despite repeated warnings and opportunities to leave. It should be noted, however, that sound at this frequency at a significant volume cannot be generated by television speakers, so you might feel only slight movements in your tummy but don’t poo. However sub-woofers might help which were used on the test subject.
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