Nobody had conceived that sound might exist at such low frequencies, and so no equipment had been developed to detect it. They concluded the sound being generated by the motor was so low in pitch that it was below their biological ability to hear, and that their recording equipment was not capable of detecting these frequencies. When Gavreau and the team attempted to measure an amplitude and pitch, they were shocked when their equipment detected no audible sound. After weeks of speculation on the source of the nausea - the team was convinced that it was a pathogen or an untraced leak of noxious chemical fumes in the facility - they discovered that a 'loosely poised low speed motor. The group was experiencing bouts of periodic and deeply unpleasant nausea. His interest in infrasonic waves first came about in 1957 in the large concrete building that he and his research team were working in. One of the pioneers in infrasonic research was French scientist Vladimir Gavreau. The Allies of World War I first used infrasound to locate artillery. Subwoofers designed to produce infrasound are capable of sound reproduction an octave or more below that of most commercially available subwoofers, and are often about 10 times the size. In music, acoustic waveguide methods, such as a large pipe organ or, for reproduction, exotic loudspeaker designs such as transmission line, rotary woofer, or traditional subwoofer designs can produce low-frequency sounds, including near-infrasound. Infrasound is characterized by an ability to get around obstacles with little dissipation. People use this frequency range for monitoring earthquakes and volcanoes, charting rock and petroleum formations below the earth, and also in ballistocardiography and seismocardiography to study the mechanics of the earth. The study of such sound waves is sometimes referred to as infrasonics, covering sounds beneath 20 Hz down to 0.1 Hz (and rarely to 0.001 Hz). While the ear is the primary organ for sensing low sound, at higher intensities it is possible to feel infrasound vibrations in various parts of the body. Hearing becomes gradually less sensitive as frequency decreases, so for humans to perceive infrasound, the sound pressure must be sufficiently high. Infrasound, sometimes referred to as low frequency sound, 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).

Infrasound arrays at monitoring station in Qaanaaq, Greenland. Step 15Īs a finishing touch, select the “Bottom” layer and decrease the opacity to around 40% to make it look like a reflection.Vibrations with frequencies lower than 20 hertz Reposition the layer above the “Top” layer and go to Layer > Create Clipping Mask. Press Ctrl+J on your keyboard to duplicate the Gradient Fill layer. Then set the Style to “Linear”, the Angle to “0º” and click OK. In the Gradient Fill window, pick any gradient you want from the thumbnail dropdown. Be sure to check the “Use Previous Layer to Create Clipping Mask” option and click OK. Select the “Bottom” layer and go to Layer > New Fill Layer > Gradient. Reposition the “Top” layer to make both lines match in the middle as shown.

With the “Top” layer selected, go to Edit > Transform > Flip Vertical. Go to Image > Image Rotation > 90º Clockwise. Go to Filter > Wind (or press Alt+Ctrl+F on your keyboard) four times to apply the same Wind effect 4 more times. Set the Method to “Wind”, the Direction to be “From the left” and click OK. Step 3ĭraw a line from the top to the bottom and center it in the middle of the canvas.

In the top toolbar be sure to have the Mode set to “Shape”, the Fill to “White” and the Weight to “1 px”. In this case I will set my canvas size to 1000 x 1500 (in a Vertical orientation, which later we will rotate). Open Photoshop and make a new file at any size you want, but set the Background color to Black.

Soundwave backgrounds