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A leak noise correlator is an electronic device used for Leak Detection and as a leak locator to find leaks in pressurized water or gas lines.. Typically, microphones or acoustic sound sensors are placed in contact with the pipe, at two or more points, to record the sound emitted by a leak (e.g. a hissing noise) somewhere between the points.
A 1973 report cites a university study of fifty cases of people complaining about a "low throbbing background noise" that others were unable to hear. The sound, always peaking between 30 and 40 Hz (hertz), was found to only be heard during cool weather with a light breeze, and often early in the morning. These noises were often confined to a 10 ...
Sibilant, a group of consonants that have a hissing or hushing sound; Tape hiss, high-frequency noise on analogue magnetic tape recordings; The Hiss, a five piece rock band from Atlanta, Georgia; Honda Ignition Security System, a vehicle immobiliser; A sound made by snakes, cats and various other animals as a warning; see list of animal sounds
Hollow (e.g. [s]): This hollow accepts a large volume of air that is forced through a typically narrow aperture that directs a high-velocity jet of air against the teeth, which results in a high-pitched, piercing "hissing" sound. Because of the prominence of these sounds, they are the most common and most stable of sibilants cross-linguistically.
Steady flow through a corrugated pipe at low Reynolds numbers results in a fluctuating volumetric flow rate that generates a monopoly-like sound field at the pipe exit. Examples of such pipes are shown in figure on the right. The yellow plastic pipe shown in the image is a toy that whistles when the pipe is whirled around.
The division features eighty-eight ranks of string pipes built to Wanamaker specifications by the W.W. Kimball Company of Chicago. [5] The organ is famed for its orchestra-like sound, coming from pipes that are voiced softer than usual, allowing an unusually rich build-up because of the massing of pipe-tone families. The organ was also built ...
The sound of an organ pipe is made up of a set of harmonics formed by acoustic resonance, with wavelengths that are fractions of the length of the pipe.There are nodes of stationary air, and antinodes of moving air, two of which will be the two ends of an open-ended organ-pipe (the mouth, and the open end at the top). [1]
Experiment using two tuning forks oscillating at the same frequency.One of the forks is being hit with a rubberized mallet. Although the first tuning fork hasn't been hit, the other fork is visibly excited due to the oscillation caused by the periodic change in the pressure and density of the air by hitting the other fork, creating an acoustic resonance between the forks.
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