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-aka “pop shield”-
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-as of [25 OCTOBER 2024]–
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-a pop filter is an [anti-pop noise protection filter] for [microphones], typically used in a [recording studio]-
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(it serves to reduce/eliminate ‘popping’ sounds caused by the ‘mechanical impact’ of ‘fast-moving air’ on the ‘microphone’ during ‘recorded speech/singing’)
(it also keeps ‘moisture’ off the ‘microphone’ which can cause ‘mold growth’)
(additionally, a ‘pop filter’ can protect against the accumulation of ‘saliva’ on the ‘microphone element’)
(salts in ‘human saliva’ are corrosive and thus use of a pop filter may improve the ‘life of the microphone’)
(a typical ‘pop filter’ is composed of one or more layers of acoustically semi-transparent material such as woven nylon stretched over a circular frame, and often includes a clamp + a flexible mounting bracket)
(‘metal pop filters’ use a ‘fine mesh metal screen’ in place of the ‘nylon’)
(an improvised pop shield, functionally identical to the professional units, can be made with material from tights or stockings stretched over a kitchen sieve, embroidery hoop or a loop of wire such as a bent ‘coat hanger’)
It is important that the pop shield not be attached directly to the microphone as vibrations will be transmitted from the shield to the mic.
(‘popping’ sounds occur particularly in the pronunciation of ‘aspirated plosives’ (such as the first ‘p’ in the english word “popping”))
(“pop filters” are designed to attenuate the energy of the ‘plosive’, which otherwise might exceed the design input capacity of the microphone, leading to ‘clipping’)
(in effect, the plosive’s discrete envelope of sound energy is intercepted and broken up by the strands of the filter material before it can impinge on, and momentarily distort, the sensitive diaphragm of the microphone)
(‘pop filters’ do not appreciably affect hissing sounds or sibilance, for which ‘de-essing’ is used)
(a ‘pop filter’ differs from a ‘microphone windscreen’)
(‘pop filters’ are generally used in a studio environment, while ‘windscreens’ are typically used outdoors)
(‘wind=screens’ are also used by vocalists on stage to reduce ‘plosives’ and ‘saliva’, though they may not be as acoustically transparent as a studio’ pop filter’)
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(some ‘studio condenser microphones’ have an integral ‘pop filter’ built into their design, to reduce ‘sound distortion’ due to ‘clipping’)
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