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Proximity effect (audio)
The proximity effect in audio is an increase in bass or low frequency response when a sound source is close to a microphone.〔(Proximity Effect in Directional Microphones ) Shure Pro Audio Technical Library〕〔
==Technical explanation==
Proximity effect is a change in the frequency response of a microphone, having a directional pickup pattern, that produces an emphasis on lower frequencies. It is caused by the use of ports to create directional polar pickup patterns, so omni-directional microphones do not exhibit the effect (it should be noted that this is not necessarily true of the "omni" pattern on multipattern condenser mics, which create the "omni" pattern by summing two back-to-back cardioid capsules, which may or may not share a common backplate.) Depending on the microphone design, proximity effect may result in a boost of up to 16 dB or more, depending on the size of the microphone's diaphragm and the distance of the source.
A ready (and common) example of proximity effect can be observed with cardioid dynamic vocal microphones (though it is not limited to this class of microphone) when the vocalist is very close to or even touching the mic with their lips. The effect is heard as a 'fattening up' of the voice. Many radio broadcast microphones are large diameter cardioid pickup pattern microphones, and radio announcers are often observed to employ proximity effect, adding a sense of gravitas and depth to the voice. Proximity effect is sometimes referred to as "bass tip-up."〔(Proximity Effect ) music technology glossary〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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