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On 25 August 2009, U.S. patent 7,580,533 was issued for a device that uses a laser beam and smoke or vapor to detect sound vibrations in free air ("Particulate Flow Detection Microphone based on a laser-photocell pair with a moving stream of smoke or vapor in the laser beam's path"). Sound pressure waves cause disturbances in the smoke that in ...
Limitation on calls to prayer by Muslims exist in countries including Canada, the Netherlands, Germany, Switzerland, France, the UK, Austria, Norway, and Belgium. [12] New Zealand does not have specific restrictions on mosques, but rules that control the volume of amplified noise in general will often prevent mosques from using loudspeakers.
The lack of reflections in a free field means that any sound in the field is entirely determined by a listener or microphone because it is received through the direct sound of the sound source. This makes the open field a direct sound field. [3] In a free field, sound is attenuated with increased distance according to the inverse-square law. [1]
More generally, prayer can also have the purpose of thanksgiving or praise, and in comparative religion is closely associated with more abstract forms of meditation and with charms or spells. [1] Prayer can take a variety of forms: it can be part of a set liturgy or ritual, and it can be performed alone or in
A wireless microphone, or cordless microphone, is a microphone without a physical cable connecting it directly to the sound recording or amplifying equipment with which it is associated. Also known as a radio microphone , it has a small, battery-powered radio transmitter in the microphone body, which transmits the audio signal from the ...
The pipe which held the "collector head" (microphone) can be seen in front of the structure. An acoustic mirror is a passive device used to reflect and focus (concentrate) sound waves . Parabolic acoustic mirrors are widely used in parabolic microphones to pick up sound from great distances, employed in surveillance and reporting of outdoor ...
Beside The Still Waters is a daily devotional widely used by adherents of the Anabaptist Christian tradition. Each page of the "devotional begins with a Scripture reference and verse on a theme" with a subsequent "reflection on the theme, followed by an inspirational aphorism or a line from a hymn, and a few additional biblical references for those who would like to read through the entire ...
The precedence effect or law of the first wavefront is a binaural psychoacoustical effect concerning sound reflection and the perception of echoes.When two versions of the same sound presented are separated by a sufficiently short time delay (below the listener's echo threshold), listeners perceive a single auditory event; its perceived spatial location is dominated by the location of the ...