Content deleted Content added
clarifications |
review: rm limiter in a different sense |
||
Line 133:
[[Hearing aid]]s use a compressor to bring the audio volume into the listener's hearing range. To help the patient perceive the direction sound comes from, some hearing aids use [[binaural recording|binaural]] compression.<ref>{{Cite book |title=The textbook of hearing aid amplification |last=Sandlin |first=Robert E. |date=2000 |publisher=Singular Thomson Learning |isbn=1565939972 |edition=2nd |___location=San Diego, California |oclc=42475568}}</ref>
Compressors are also used for [[Hearing protectors|hearing protection]] in some electronic active hearing protection [[earmuffs]] and [[earplugs]], to let sounds at ordinary volumes be heard normally while attenuating louder sounds, possibly also amplifying softer sounds. This allows, for example, shooters wearing hearing protection at a shooting range to converse normally, while sharply attenuating the much louder sounds of the gunshots,<ref>{{cite web |url=https://www.pewpewtactical.com/best-shooting-ear-protection/ |title=10 Best Shooting Ear Protection |quote=They are comfy for hours with their gel caps, have easily accessible button controls, great sound cutoff and compression, and allow for earplugs if the decent 22db NRR doesn’t cut it. |access-date=2021-05-25}}</ref> and similarly for musicians to hear quiet music but be protected from loud noises such as drums or cymbal crashes.{{citation needed|date=December 2013}}
In applications of machine learning where an algorithm is training on audio samples, dynamic range compression is a way to augment samples for a larger data set.<ref>{{Cite journal |last1=Salamon |first1=Justin |last2=Bello |first2=Juan Pablo |date=March 2017 |title=Deep Convolutional Neural Networks and Data Augmentation for Environmental Sound Classification |journal=IEEE Signal Processing Letters |volume=24 |issue=3 |pages=279–283 |arxiv=1608.04363 |doi=10.1109/LSP.2017.2657381 |bibcode=2017ISPL...24..279S |s2cid=3537408 |issn=1070-9908 }}</ref>
Line 142:
Compression and limiting are identical in process but different in degree and perceived effect. A [[limiter]] is a compressor with a high ratio and, generally, a fast attack time. Compression with ratio of 10:1 or more is generally considered limiting.<ref name="tcelectronic.com">{{Cite book |url=http://www.tcelectronic.com/media/droney_massey_2001_compres.pdf |title=Compression Applications |last1=Droney |first1=Maureen |last2=Massey |first2=Howard |date=September 2001 |publisher=[[TC Electronic]] |archive-url=https://web.archive.org/web/20101231072136/http://www.tcelectronic.com/media/droney_massey_2001_compres.pdf |archive-date=2010-12-31 |url-status=dead}}</ref>
''Brick wall limiting'' has a very high ratio and a very fast attack time. Ideally, this ensures that an audio signal never exceeds the amplitude of the threshold. Ratios of 20:1 all the way up to ∞:1 are considered ''brick wall''.<ref name="tcelectronic.com" /> The sonic results of more than momentary and infrequent
Some [[bass amp]]s and [[PA system]] amplifiers include limiters to prevent sudden volume peaks from causing distortion
== Side-chaining ==
| |||