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Dynamic range compression

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185: 486: 1165:, Emmanuel Deruty and Damien Tardieu performed a systematic study describing the influence of compressors and brickwall limiters on the musical audio signal. The experiment involved four software limiters: Waves L2, Sonnox Oxford Limiter, Thomas Mundt's Loudmax, Blue Cat's Protector, as well as four software compressors: Waves H-Comp, Sonnox Oxford Dynamics, Sonalksis SV-3157, and URS 1970. The study provides objective data on what limiters and compressors do to the audio signal. 895: 615: 953: 44: 197: 942: 1039:. It is a form of upward compression that facilitates dynamic control without significant audible side effects so long as the ratio is relatively low and the compressor's sound is relatively neutral. On the other hand, a high compression ratio with significant audible artifacts can be chosen in one of the two parallel signal paths. This is used by some concert mixers and recording engineers as an artistic effect called 883:, 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, and similarly for musicians to hear quiet music but be protected from loud noises such as drums or cymbal crashes. 770: 371: 527: 2888: 1180:, R 128 LRA, and density of clipped samples. RMS power accounts for the signal's physical level, R 128 loudness for the perceived level. The crest factor, which is the difference between the signal's peak and its average power, is on occasions considered as a basis for the measure of micro-dynamics, for instance in the 580:
The look-ahead function is designed to overcome the problem of being forced to compromise between slow attack rates that produce smooth-sounding gain changes, and fast attack rates capable of catching transients. Look-ahead is implemented by splitting the input signal and delaying one side (the audio
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Multiband compressors can act differently on different frequency bands. The advantage of multiband compression over full-bandwidth compression is that problems related to a specific frequency range can be fixed without unnecessary compression in the other, unrelated frequencies. The downside is that
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Most television commercials are heavily compressed to achieve near-maximum perceived loudness while staying within permissible limits. This causes a problem that TV viewers often notice: when a station switches from minimally compressed program material to a heavily compressed commercial, the volume
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Another control a compressor might offer is hard knee or soft knee selection. This controls whether the bend in the response curve between below threshold and above threshold is abrupt (hard) or gradual (soft). A soft knee slowly increases the compression ratio as the level increases and eventually
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The length of each period is determined by the rate of change and the required change in gain. For more intuitive operation, a compressor's attack and release controls are labeled as a unit of time (often milliseconds). This is the amount of time it takes for the gain to change a set amount of dB or
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Broadcasters use compressors in order that their station sounds louder than comparable stations. The effect is to make the more heavily compressed station jump out at the listener at a given volume setting. This is not limited to inter-channel differences; they also exist between programme material
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Compression can also be used on instrument sounds to create effects not primarily focused on stabilizing the volume. For instance, drum and cymbal sounds tend to decay quickly, but a compressor can make the sound appear to have a more sustained tail. Guitar sounds are often compressed to produce a
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Compression is often used in music production to make instruments more consistent in dynamic range, so that they "sit" more nicely in the mix with the other instruments (neither disappear during short periods of time, nor overpower the other instruments during short periods). Vocal performances in
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Compression is often applied in audio systems for restaurants, retail, and similar public environments that play background music at a relatively low volume and need it compressed, not just to keep the volume fairly constant, but also to make quiet parts of the music audible over ambient noise.
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is the period when the compressor is increasing gain in response to reduced level at the input to reach the output gain determined by the ratio, or, to unity, once the input level has fallen below the threshold. Because the loudness pattern of the source material is modified by the time-varying
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signal) by the look-ahead time. The non-delayed side (the gain control signal) is used to drive the compression of the delayed signal, which then appears at the output. This way a smooth-sounding slower attack rate can be used to catch transients. The cost of this solution is added
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over the threshold, the output signal level is reduced to 1 dB over the threshold. The gain and output level has been reduced by 3 dB. Another way of stating this is that any input signal level over the threshold will, in this case, be output at a level which is only 25%
1125:, where an RMS compressor (for general gain control) is followed by a fast peak-sensing limiter (for overload protection). Done properly, even heavy serial compression can sound natural in a way not possible with a single compressor. It is most often used to even out erratic 543:
A peak-sensing compressor responds to the peak level of the input signal. While providing tighter peak level control, peak level sensing does not necessarily relate to human perception of loudness. Some compressors apply a power measurement function (commonly
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reaches the compression ratio set by the user. A soft knee reduces the potentially audible transition from uncompressed to compressed, and is especially applicable for higher ratio settings where the changeover at the threshold would be more noticeable.
1047:. Combining a linear signal with a compressor and then reducing the output gain of the compression chain results in low-level detail enhancement without any peak reduction; The compressor significantly adds to the combined gain at low levels only. 1221:
As far as the compressors are concerned, the authors performed two processing sessions, using a fast attack (0.5 ms) in one case, and a slow attack (50 ms) in the other. Make-up gain is deactivated, but the resulting file is normalized.
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sometimes seems to increase dramatically. Peak loudness might be the same—meeting the letter of the law—but high compression puts much more of the audio in the commercial at close to the maximum allowable, making the commercial seem much louder.
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In many compressors, the attack and release times are adjustable by the user. Some compressors, however, have the attack and release times determined by the circuit design and cannot be adjusted. Sometimes the attack and release times are
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In other words, limiters increase both physical and perceptual levels, increase the density of clipped samples, decrease the crest factor and decrease macro-dynamics (LRA) given that the amount of limiting is substantial.
689:. A compressor increases the average level of the modulation signal thus increasing the transmitted signal strength. Most modern amateur radio SSB transceivers have speech compressors built-in. Compression is also used in 747:
To help audio engineers understand what loudness range their material consists of (e.g. to check if some compression may be needed to fit it into the channel of a specific delivery platform), the EBU also introduced the
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A compressor with a side-chain input controls gain from main input to output based on the level of the signal at the side-chain input. An early innovator of side-chain compression in an effects unit was the
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In other words, fast-attack compressors increase both physical and perceptual levels, but only slightly. They decrease the density of clipped samples, and decrease both crest factor and macro-dynamics.
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Omnipressor from 1974. With side-chaining, the compressor behaves in the conventional manner when both main and side-chain inputs are supplied with the same signal. The side-chain input is used by
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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
922:. The sonic results of more than momentary and infrequent brick-wall limiting are harsh and unpleasant, thus it is more common as a safety device in live sound and broadcast applications. 728:(EBU) has been addressing this issue in the EBU PLOUD group, which consists of over 240 audio professionals, many from broadcasters and equipment manufacturers. In 2010, the EBU published 898:
Limiting and clipping compared. Note that clipping introduces a large amount of distortion whereas limiting only introduces a small amount while keeping the signal within the threshold.
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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.
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mode applies the same amount of gain reduction to both the left and right channels. This is done to prevent image shifting that can occur if each channel is compressed individually.
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to make a particular station's signal more readable to a distant station, or to make one's station's transmitted signal stand out against others. This is applicable especially in
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In other words, slow-attack compressors decrease both physical and perceptual levels, decrease macro-dynamics, but have no influence on crest factor and clipped sample density.
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can be thought of as an extreme form of downward expansion as the noise gate make the quiet sounds (for instance: noise) quieter or even silent, depending on the floor setting.
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loudness metering. As of 2016, several European TV stations have announced their support for the new norm and over 20 manufacturers have announced products supporting the new
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Most devices capable of compressing audio dynamics can also be used to reduce the volume of one audio source when another audio source reaches a certain level; this is called
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or RMS) on the input signal before comparing its level to the threshold. This produces a more relaxed compression that more closely relates to human perception of loudness.
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by 50 to 100% with a reduced dynamic range. For paging and evacuation systems, this adds clarity under noisy circumstances and saves on the number of amplifiers required.
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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.
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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
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where the signal level is measured and a circuit controlled by the measured signal level applies the required gain to the amplifier. This design, known as a
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This article is about a process that intentionally reduces the dynamic range of audio signals. For similar reductions caused by circuit imperfections, see
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operation of compressor, it may change the character of the signal in subtle to quite noticeable ways depending on the attack and release settings used.
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A number of user-adjustable control parameters and features are used to adjust dynamic range compression signal processing algorithms and components.
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frequency-specific compression is more complex and requires more processing capacity than full-bandwidth compression and can introduce phase issues.
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within the same channel. Loudness differences are a frequent source of audience complaints, especially TV commercials and promos that seem too loud.
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Salamon, Justin; Bello, Juan Pablo (March 2017). "Deep Convolutional Neural Networks and Data Augmentation for Environmental Sound Classification".
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is the period when the compressor is decreasing gain in response to the increased level at the input to reach the gain determined by the ratio. The
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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.
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while the other aggressively compresses stronger peaks. This is the normal internal signal routing in common combination devices marketed as
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controls can be used to reduce the volume of signals that have a strong spectral content within a certain frequency range: it can act as a
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plug-in sets is increasing their use among mix engineers. The TC Electronic Finalizer included a three band compressor and was a popular
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version of the input signal, so that specific, sibilance-related frequencies (typically 4000 to 8000 hz) activate the compressor more.
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that implement compression. These can increase loudness of audio tracks, or level out the volume of highly-variable music (such as
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Hjortkjær, Jens; Walther-Hansen, Mads (2014-02-03). "Perceptual Effects of Dynamic Range Compression in Popular Music Recordings".
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software. In recorded and live music, compression parameters may be adjusted to change the way they affect sounds. Compression and
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in the range of 6–9 kHz. Another use of the side-chain in music production serves to maintain a loud bass track without the
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use a compressor to reduce the dynamic range of a signal for transmission or recording, expanding it afterward, a process called
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and hip-hop musicians purposefully use this phenomenon, causing the mix to alter in volume rhythmically in time with the beat.
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can be thought of as an extreme form of downward compression as it compresses the sounds over the threshold especially hard.
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There are a number of technologies used for variable-gain amplification, each having different advantages and disadvantages.
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A rack of audio compressors in a recording studio. From top to bottom: Retro Instruments/Gates STA level; Spectra Sonic 610;
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plug-in. Finally, R 128 LRA has been repeatedly considered as a measure of macro-dynamics or dynamics in the musical sense.
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a set percentage towards the target gain. There is no industry standard for the exact meaning of these time parameters.
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can result, affecting the tone and timbre of the music. The effort to increase loudness has been referred to as the
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after the input signal has fallen below the threshold, the compressor continues to apply dynamic range compression.
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amplifiers include limiters to prevent sudden volume peaks from causing distortion or damaging the speakers.
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the dynamic range of the audio signal. Like compression, expansion comes in two types, downward and upward.
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are identical in process but different in degree and perceived effect. A limiter is a compressor with a high
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often include compression circuitry to prevent sudden high-wattage peaks that could damage the speakers.
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Because a downward compressor only reduces the level of the signal, the ability to add a fixed amount of
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Record companies, mixing engineers and mastering engineers have been gradually increasing the overall
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Compression and limiting are identical in process but different in degree and perceived effect. A
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of commercial albums. This is achieved by using higher degrees of compression and limiting during
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to boost the perceived volume of sound while reducing the dynamic range of source audio. To avoid
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Deruty, Emmanuel; Tardieu, Damien (2014-02-03). "About Dynamic Processing in Mainstream Music".
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There are two types of compression: downward and upward. Both types of compression reduce the
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A dedicated electronic hardware unit or audio software that applies compression is called a
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Set with a slow attack, the tested compressors had the following influence on the signal:
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Set with a fast attack, the tested compressors had the following influence on the signal:
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The first 8 bars are without side-chaining applied, the second 8 are with side-chaining.
826:. This reduces the effects of a channel or recording medium with limited dynamic range. 284: 2858: 2853: 2800: 2760: 2478: 2312: 2269: 1365: 1098: 714: 355: 319:
where the grid-to-cathode voltage changes to alter the gain. Optical compressors use a
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A compressor reduces the level of an audio signal if its amplitude exceeds a certain
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Hands-on Guide to Streaming Media: An Introduction to Delivering On-Demand Media
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Multiband compressors work by first splitting the signal through some number of
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units, or built-in devices in bass amps, to even out the sound levels of their
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at the output is usually provided so that an optimum output level is produced.
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the threshold remain unaffected. This is the most common type of compressor. A
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There is no industry standard and different manufacturers define differently.
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A compressor may provide a degree of control over how quickly it acts. The
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The trend of increasing loudness as shown by waveform images of the song "
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Description of expansion, compression, and limiting in an audio processor
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Giannoulis, Dimitrios; Massberg, Michael; Reiss, Joshua D. (2012-07-09).
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Threshold timing behavior is subject to attack and release settings (see
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type, is used today in most compressors. Earlier designs were based on a
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to make an audio program stand out. It is an integral technology in some
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Loudness range: A measure to supplement EBU R 128 loudness normalisation
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expansion makes the quiet sounds below the threshold even quieter. A
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Serrà, J; Corral, A; Boguñá, M; Haro, M; Arcos, JL (26 July 2012).
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Waves – Linear-Phase MultiBand Software Audio Processor Users Guide
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Different compression ratios for a signal level above the threshold
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A feed-forward compressor design (left) and feedback design (right)
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expansion makes the louder sounds above the threshold even louder.
55:; Smart Research C2; Chandler Limited TG1; Daking FET (91579); and 2873: 2286: 1907:(2nd ed.). San Diego, California: Singular Thomson Learning. 1815:'EBU Mode' metering to supplement EBU R 128 loudness normalisation 1205:
decrease of EBU R 128 LRA, but only for high amounts of limiting,
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The signal entering a compressor is split; one copy is sent to a
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layout where the signal level was measured after the amplifier.
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The tested limiters had the following influence on the signal:
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Inserting the compressor in a parallel signal path is known as
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Audio Production Worktext: Concepts, Techniques, and Equipment
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The Loudness War: Background, Speculation and Recommendations
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In music production, multiband compressors are primarily an
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Jeffs, Rick; Holden, Scott; Bohn, Dennis (September 2005).
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Compression is used to improve performance and clarity in
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for hardware compressors), where a lower threshold (e.g.
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Ciletti, Eddie; Hill, David; Wolff, Paul (2008-04-19).
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Sabin, William E.; Schoenike, Edgar O., eds. (1998).
1637:(190724 ed.). Universal Audio. pp. 219–220. 1573:"Dynamics Processors – Technology & Applications" 1363:
Reese, David E; Gross, Lynne S; Gross, Brian (2009).
455: 437:: a ratio of 4:1 means that if input level is 4  2831: 2738: 2677: 2567: 2477: 2180: 2178: 2176: 2019: 2017: 1476:"An Overview of Compressor/Limiters and Their Guts" 1023:causing undue peaks that result in loss of overall 685:. An SSB signal's strength depends on the level of 446:as much over the threshold as its input level was. 2363: 2024:Droney, Maureen; Massey, Howard (September 2001). 1646: 1644: 1548:"Audio compressor controls: The threshold control" 1364: 693:, especially in transmitted audio of professional 602:Compression can increase average output gain of a 461: 421:setting. For an amount of time determined by the 248:Some compressors also have the ability to do the 237:compression increases the volume of quiet sounds 152:. It is used on voice to reduce sibilance and in 1161:In an article published in January 2014 by the 1093:commonly use multiband compressors to increase 673:Compression is used in voice communications in 2365:"Loudness Range (LRA) - Design and Evaluation" 1416:"Dynamic Range Processing and Digital Effects" 1406:"Dynamic Range Processing and Digital Effects" 836:players often use compression effects, either 433:The amount of gain reduction is determined by 219:compression reduces the volume of loud sounds 2455: 875:in some electronic active hearing protection 489:The attack and release phases in a compressor 8: 2435:Information on Compression in Home Recording 666:) by feeding the compressor's side-chain an 82:or amplifies quiet sounds, thus reducing or 2053: 2051: 1651:Bridge, The Broadcast (November 23, 2016). 732:which introduces a new way of metering and 2462: 2448: 2440: 2060:"Beyond The Basics: Sidechain Compression" 1833: 1831: 1808: 1806: 1804: 1528:. Vol. 4, no. 3. Universal Audio 1241:slight decrease of clipped sample density. 1109:Serial compression is a technique used in 945:The sidechain of a feed-forward compressor 78:operation that reduces the volume of loud 2869:Music technology (electronic and digital) 2311: 2285: 1973: 1905:The textbook of hearing aid amplification 1452: 1168:Five signal descriptors were considered: 454: 2337:Journal of the Audio Engineering Society 2245:"'Dynamic Range' & The Loudness War" 2187:Journal of the Audio Engineering Society 1441:Journal of the Audio Engineering Society 1163:Journal of the Audio Engineering Society 940: 893: 484: 283: 176:Two methods of dynamic range compression 42: 2221:. 129th AES Convention. San Francisco: 1358: 1356: 1331:(1 ed.). Focal Press. p. 84. 1317: 1265:no influence on clipped sample density. 414: 241:a certain threshold. The louder sounds 130: 2389: 2378: 1232:slight increase of EBU R 128 loudness, 984: 223:a certain threshold. The quiet sounds 1522:"Compression Technology and Topology" 631:are compressed for the same reason. 7: 2084:"50th Flashback #3: The Omnipressor" 781:mastered on CD four times since 1983 2243:Deruty, Emmanuel (September 2011). 2212:Vickers, Earl (4–7 November 2010). 1880:"Compression in Audio Music Mixing" 1628:"Fairchild Tube Limiter Collection" 1208:increase of clipped sample density. 709:Compression is used extensively in 658:A compressor can be used to reduce 530:Hard Knee and Soft Knee compression 315:are used in a configuration called 639: 456: 245:the threshold remain unaffected. 94:. Compression is commonly used in 25: 2710:Recording studio as an instrument 1937:"10 Best Shooting Ear Protection" 1782:Davies, David (9 December 2013). 1606:"Advanced Compression Techniques" 1157:Objective influence on the signal 646:, side-chaining is often used on 346:When working with digital audio, 27:Audio signal processing operation 2886: 2362:Skovenborg, Esben (2012-04-26). 2111:"Techniques For Vocal De-essing" 1696:"Techniques For Vocal De-essing" 1500:"Model LA-2A Leveling Amplifier" 985:Problems playing this file? See 967: 699:remote control dispatch consoles 679:single-sideband (SSB) modulation 618:An inexpensive guitar compressor 195: 183: 96:sound recording and reproduction 2058:Colletti, Justin (2013-06-27). 1723:HF radio systems & circuits 1256:decrease of EBU R 128 loudness, 1199:increase of EBU R 128 loudness, 390:. Threshold is commonly set in 2426:Article on Optical Compressors 1962:IEEE Signal Processing Letters 1015:, reducing the level of vocal 871:Compressors are also used for 635:fuller, more sustained sound. 144:and to improve consistency in 1: 1604:White, Paul (December 2000). 1393:– via Internet Archive. 1307:, the photographic equivalent 1259:no influence on crest factor, 1229:slight increase of RMS power, 1078:tool, but their inclusion in 2893:Record production portal 1546:Mellor, David (2017-11-16). 1520:Berners, Dave (April 2006). 398:for digital compressors and 323:stimulated by a small lamp ( 2864:Music technology (electric) 2368:. Audio Engineering Society 2161:TC Electronic Finalizer 96K 1903:Sandlin, Robert E. (2000). 1760:European Broadcasting Union 1480:www.tangible-technology.com 726:European Broadcasting Union 2934: 2417: (archived 2019-06-05) 2375:– via AES E-Library. 1657:www.thebroadcastbridge.com 1262:decrease of EBU R 128 LRA, 1238:decrease of EBU R 128 LRA, 1086:tool around year 2000. 963:Uplifting Trance Sidechain 901: 784: 736:. The Recommendation uses 662:('ess' sounds) in vocals ( 360:digital audio workstations 126: 29: 2882: 2421:Dynamic range compression 2223:Audio Engineering Society 2109:Senior, Mike (May 2009). 1349:– via Google Books. 1235:decrease of crest factor, 1202:decrease of crest factor, 1080:digital audio workstation 348:digital signal processing 119:digital audio workstation 64:Dynamic range compression 53:Empirical Labs Distressor 2027:Compression Applications 1992:10.1109/LSP.2017.2657381 1371:. Focal Press. pp.  1325:Follansbee, Joe (2006). 1295:LA-2A Leveling Amplifier 1089:On-air signal chains of 337:field effect transistors 333:electroluminescent panel 129:and, generally, a short 104:live sound reinforcement 36:Audio compression (data) 2349:10.17743/jaes.2014.0003 2199:10.17743/jaes.2014.0001 1526:Universal Audio WebZine 820:Noise reduction systems 585:through the processor. 462:{\displaystyle \infty } 294:variable-gain amplifier 252:of compression, namely 76:audio signal processing 2388:Cite journal requires 1671:"What is Sidechaining" 1284:Automatic gain control 1253:decrease of RMS power, 1196:increase of RMS power, 1182:TT Dynamic Range Meter 1143:software audio players 1137:Software audio players 956: 946: 899: 782: 644:electronic dance music 619: 531: 490: 463: 375: 289: 138:public address systems 60: 2781:Ghostwriters in music 1176:integrated loudness, 1051:Multiband compression 955: 944: 897: 830:Instrument amplifiers 772: 617: 529: 488: 469::1 is often known as 464: 449:The highest ratio of 373: 366:Controls and features 287: 108:instrument amplifiers 46: 1524:. Analog Obsession. 1041:New York compression 1037:parallel compression 1031:Parallel compression 840:available in pedal, 453: 213:of an audio signal. 190:Downward compression 2918:Dynamics processing 2296:2012NatSR...2E.521S 1984:2017ISPL...24..279S 1635:UAD Plug-Ins Manual 1123:compressor-limiters 916:Brick wall limiting 539:Peak vs RMS sensing 522:Soft and hard knees 296:and the other to a 18:Compression (audio) 2695:Hip hop production 2274:Scientific Reports 1105:Serial compression 1045:Motown compression 957: 947: 900: 873:hearing protection 783: 752:(LRA) descriptor. 620: 532: 491: 481:Attack and release 477:time has expired. 459: 376: 290: 202:Upward compression 61: 2913:Audio engineering 2900: 2899: 2502:Critical distance 2304:10.1038/srep00521 1763:. 25 October 2011 1552:Audio Masterclass 1382:978-0-240-81098-0 1279:1176 Peak Limiter 1065:crossover filters 1061:band-pass filters 972: 744:loudness meters. 734:normalizing audio 691:land mobile radio 516:program dependent 16:(Redirected from 2925: 2891: 2890: 2889: 2806:Session musician 2471:Music production 2464: 2457: 2450: 2441: 2430:Sweetwater Sound 2398: 2397: 2391: 2386: 2384: 2376: 2374: 2373: 2367: 2359: 2353: 2352: 2332: 2326: 2325: 2315: 2289: 2265: 2259: 2258: 2256: 2255: 2240: 2234: 2233: 2231: 2229: 2220: 2209: 2203: 2202: 2182: 2171: 2170: 2169: 2168: 2156: 2150: 2149: 2148: 2147: 2141: 2131: 2125: 2124: 2122: 2121: 2113:. Sound Advice. 2106: 2100: 2099: 2097: 2095: 2080: 2074: 2073: 2071: 2070: 2055: 2046: 2045: 2043: 2037:. Archived from 2032: 2021: 2012: 2011: 1977: 1957: 1951: 1950: 1945: 1944: 1933: 1927: 1926: 1900: 1894: 1893: 1891: 1890: 1876: 1870: 1869: 1867: 1866: 1861:. Pinsent Masons 1851: 1845: 1844: 1835: 1826: 1825: 1824: 1823: 1810: 1799: 1798: 1796: 1794: 1779: 1773: 1772: 1770: 1768: 1751: 1745: 1744: 1718: 1712: 1711: 1709: 1707: 1692: 1686: 1685: 1683: 1681: 1667: 1661: 1660: 1648: 1639: 1638: 1632: 1624: 1618: 1617: 1612:. Archived from 1601: 1595: 1594: 1589: 1588: 1581:Rane Corporation 1568: 1562: 1561: 1559: 1558: 1543: 1537: 1536: 1534: 1533: 1517: 1511: 1510: 1504: 1496: 1490: 1489: 1487: 1486: 1471: 1465: 1464: 1462: 1461: 1456: 1438: 1429: 1423: 1422: 1420: 1412: 1410: 1401: 1395: 1394: 1370: 1360: 1351: 1350: 1322: 1289:Gain compression 974: 973: 954: 610:Music production 556:A compressor in 546:root mean square 468: 466: 465: 460: 445: 409: 405: 199: 187: 32:Gain compression 21: 2933: 2932: 2928: 2927: 2926: 2924: 2923: 2922: 2903: 2902: 2901: 2896: 2887: 2885: 2878: 2827: 2796:Record producer 2749: 2745: 2734: 2688: 2684: 2673: 2614:Double tracking 2570: 2563: 2554:Sound recording 2492:Audio mastering 2473: 2468: 2415:Wayback Machine 2407: 2402: 2401: 2387: 2377: 2371: 2369: 2361: 2360: 2356: 2334: 2333: 2329: 2267: 2266: 2262: 2253: 2251: 2242: 2241: 2237: 2227: 2225: 2218: 2211: 2210: 2206: 2184: 2183: 2174: 2166: 2164: 2158: 2157: 2153: 2145: 2143: 2139: 2133: 2132: 2128: 2119: 2117: 2108: 2107: 2103: 2093: 2091: 2090:. 10 March 2021 2082: 2081: 2077: 2068: 2066: 2057: 2056: 2049: 2041: 2030: 2023: 2022: 2015: 1959: 1958: 1954: 1942: 1940: 1935: 1934: 1930: 1915: 1902: 1901: 1897: 1888: 1886: 1884:The Whippinpost 1878: 1877: 1873: 1864: 1862: 1853: 1852: 1848: 1837: 1836: 1829: 1821: 1819: 1812: 1811: 1802: 1792: 1790: 1781: 1780: 1776: 1766: 1764: 1753: 1752: 1748: 1733: 1720: 1719: 1715: 1705: 1703: 1694: 1693: 1689: 1679: 1677: 1669: 1668: 1664: 1650: 1649: 1642: 1630: 1626: 1625: 1621: 1603: 1602: 1598: 1586: 1584: 1570: 1569: 1565: 1556: 1554: 1545: 1544: 1540: 1531: 1529: 1519: 1518: 1514: 1507:Universal Audio 1502: 1498: 1497: 1493: 1484: 1482: 1473: 1472: 1468: 1459: 1457: 1454:10.1.1.260.1340 1436: 1431: 1430: 1426: 1418: 1413: 1408: 1403: 1402: 1398: 1383: 1362: 1361: 1354: 1339: 1324: 1323: 1319: 1314: 1275: 1219: 1190: 1159: 1151:classical music 1139: 1111:sound recording 1107: 1097:while avoiding 1084:audio mastering 1076:audio mastering 1053: 1033: 992: 991: 983: 981: 980: 979: 978: 975: 968: 965: 958: 952: 939: 906: 892: 817: 789: 767: 758: 707: 656: 612: 604:power amplifier 596: 591: 578: 566: 554: 541: 524: 483: 451: 450: 444:(i.e. 1 over 4) 443: 431: 407: 403: 384: 368: 356:mixing consoles 282: 207: 206: 205: 204: 203: 200: 192: 191: 188: 179: 178: 170: 162:noise reduction 39: 28: 23: 22: 15: 12: 11: 5: 2931: 2929: 2921: 2920: 2915: 2905: 2904: 2898: 2897: 2883: 2880: 2879: 2877: 2876: 2871: 2866: 2861: 2856: 2851: 2846: 2841: 2835: 2833: 2829: 2828: 2826: 2825: 2820: 2819: 2818: 2808: 2803: 2801:Rhythm section 2798: 2793: 2788: 2783: 2778: 2773: 2768: 2763: 2761:Audio engineer 2758: 2752: 2750: 2748: 2747: 2743: 2739: 2736: 2735: 2733: 2732: 2727: 2722: 2717: 2712: 2707: 2705:Overproduction 2702: 2697: 2691: 2689: 2687: 2686: 2682: 2678: 2675: 2674: 2672: 2671: 2666: 2661: 2656: 2651: 2646: 2641: 2636: 2634:Exciter effect 2631: 2626: 2621: 2611: 2606: 2596: 2591: 2586: 2581: 2575: 2573: 2565: 2564: 2562: 2561: 2556: 2551: 2546: 2541: 2536: 2531: 2526: 2525: 2524: 2519: 2509: 2504: 2499: 2494: 2489: 2483: 2481: 2475: 2474: 2469: 2467: 2466: 2459: 2452: 2444: 2438: 2437: 2432: 2423: 2418: 2406: 2405:External links 2403: 2400: 2399: 2390:|journal= 2354: 2343:(1/2): 37–41. 2327: 2260: 2249:Sound on Sound 2235: 2204: 2193:(1/2): 42–55. 2172: 2151: 2126: 2115:Sound on Sound 2101: 2088:Eventide Audio 2075: 2047: 2044:on 2010-12-31. 2013: 1968:(3): 279–283. 1952: 1928: 1913: 1895: 1871: 1846: 1827: 1800: 1774: 1746: 1731: 1713: 1700:Sound on Sound 1687: 1662: 1640: 1619: 1616:on 2015-09-24. 1610:Sound On Sound 1596: 1563: 1538: 1512: 1491: 1466: 1447:(6): 399–408. 1424: 1396: 1381: 1352: 1337: 1316: 1315: 1313: 1310: 1309: 1308: 1302: 1297: 1292: 1286: 1281: 1274: 1271: 1267: 1266: 1263: 1260: 1257: 1254: 1243: 1242: 1239: 1236: 1233: 1230: 1218: 1215: 1210: 1209: 1206: 1203: 1200: 1197: 1189: 1186: 1158: 1155: 1138: 1135: 1106: 1103: 1099:overmodulation 1091:radio stations 1052: 1049: 1032: 1029: 982: 976: 966: 961: 960: 959: 950: 949: 948: 938: 935: 902:Main article: 891: 888: 816: 813: 766: 763: 757: 754: 750:Loudness Range 715:overmodulation 706: 703: 695:walkie-talkies 655: 652: 611: 608: 595: 592: 590: 587: 577: 574: 565: 562: 558:stereo linking 553: 552:Stereo linking 550: 540: 537: 523: 520: 482: 479: 458: 430: 427: 383: 380: 367: 364: 352:audio plug-ins 281: 278: 201: 194: 193: 189: 182: 181: 180: 174: 173: 172: 171: 169: 166: 51:162; Dbx 165; 26: 24: 14: 13: 10: 9: 6: 4: 3: 2: 2930: 2919: 2916: 2914: 2911: 2910: 2908: 2895: 2894: 2881: 2875: 2872: 2870: 2867: 2865: 2862: 2860: 2857: 2855: 2852: 2850: 2847: 2845: 2844:Interpolation 2842: 2840: 2837: 2836: 2834: 2830: 2824: 2821: 2817: 2814: 2813: 2812: 2811:Backup singer 2809: 2807: 2804: 2802: 2799: 2797: 2794: 2792: 2789: 2787: 2784: 2782: 2779: 2777: 2774: 2772: 2769: 2767: 2764: 2762: 2759: 2757: 2754: 2753: 2751: 2744: 2741: 2740: 2737: 2731: 2728: 2726: 2725:Wall of Sound 2723: 2721: 2718: 2716: 2713: 2711: 2708: 2706: 2703: 2701: 2698: 2696: 2693: 2692: 2690: 2683: 2680: 2679: 2676: 2670: 2667: 2665: 2662: 2660: 2657: 2655: 2652: 2650: 2647: 2645: 2644:Octave effect 2642: 2640: 2637: 2635: 2632: 2630: 2627: 2625: 2622: 2619: 2615: 2612: 2610: 2607: 2604: 2600: 2597: 2595: 2592: 2590: 2589:Chorus effect 2587: 2585: 2582: 2580: 2577: 2576: 2574: 2572: 2566: 2560: 2557: 2555: 2552: 2550: 2547: 2545: 2542: 2540: 2537: 2535: 2532: 2530: 2527: 2523: 2522:Wah-wah pedal 2520: 2518: 2515: 2514: 2513: 2510: 2508: 2505: 2503: 2500: 2498: 2495: 2493: 2490: 2488: 2485: 2484: 2482: 2480: 2476: 2472: 2465: 2460: 2458: 2453: 2451: 2446: 2445: 2442: 2436: 2433: 2431: 2427: 2424: 2422: 2419: 2416: 2412: 2409: 2408: 2404: 2395: 2382: 2366: 2358: 2355: 2350: 2346: 2342: 2338: 2331: 2328: 2323: 2319: 2314: 2309: 2305: 2301: 2297: 2293: 2288: 2283: 2279: 2275: 2271: 2264: 2261: 2250: 2246: 2239: 2236: 2224: 2217: 2216: 2208: 2205: 2200: 2196: 2192: 2188: 2181: 2179: 2177: 2173: 2163: 2162: 2155: 2152: 2138: 2137: 2130: 2127: 2116: 2112: 2105: 2102: 2089: 2085: 2079: 2076: 2065: 2061: 2054: 2052: 2048: 2040: 2036: 2035:TC Electronic 2029: 2028: 2020: 2018: 2014: 2009: 2005: 2001: 1997: 1993: 1989: 1985: 1981: 1976: 1971: 1967: 1963: 1956: 1953: 1949: 1939:. 27 May 2020 1938: 1932: 1929: 1924: 1920: 1916: 1910: 1906: 1899: 1896: 1885: 1881: 1875: 1872: 1860: 1856: 1850: 1847: 1842: 1841: 1834: 1832: 1828: 1817: 1816: 1809: 1807: 1805: 1801: 1789: 1785: 1778: 1775: 1762: 1761: 1756: 1750: 1747: 1742: 1738: 1734: 1732:9781613530740 1728: 1724: 1717: 1714: 1701: 1697: 1691: 1688: 1676: 1672: 1666: 1663: 1658: 1654: 1647: 1645: 1641: 1636: 1629: 1623: 1620: 1615: 1611: 1607: 1600: 1597: 1593: 1582: 1578: 1574: 1567: 1564: 1553: 1549: 1542: 1539: 1527: 1523: 1516: 1513: 1508: 1501: 1495: 1492: 1481: 1477: 1470: 1467: 1455: 1450: 1446: 1442: 1435: 1428: 1425: 1417: 1407: 1400: 1397: 1392: 1388: 1384: 1378: 1374: 1369: 1368: 1359: 1357: 1353: 1348: 1344: 1340: 1338:9780240808635 1334: 1330: 1329: 1321: 1318: 1311: 1306: 1303: 1301: 1298: 1296: 1293: 1290: 1287: 1285: 1282: 1280: 1277: 1276: 1272: 1270: 1264: 1261: 1258: 1255: 1252: 1251: 1250: 1247: 1240: 1237: 1234: 1231: 1228: 1227: 1226: 1223: 1216: 1214: 1207: 1204: 1201: 1198: 1195: 1194: 1193: 1187: 1185: 1183: 1179: 1175: 1171: 1166: 1164: 1156: 1154: 1152: 1148: 1144: 1136: 1134: 1132: 1128: 1124: 1120: 1119:dynamic range 1116: 1112: 1104: 1102: 1100: 1096: 1092: 1087: 1085: 1081: 1077: 1072: 1070: 1066: 1062: 1057: 1050: 1048: 1046: 1042: 1038: 1030: 1028: 1026: 1022: 1018: 1014: 1010: 1006: 1002: 998: 990: 988: 964: 943: 937:Side-chaining 936: 934: 932: 928: 923: 921: 917: 913: 911: 905: 896: 889: 887: 884: 882: 878: 874: 869: 868:compression. 867: 863: 859: 857: 853: 849: 847: 843: 839: 838:effects units 835: 834:Electric bass 831: 827: 825: 821: 814: 812: 810: 806: 802: 798: 794: 788: 780: 776: 771: 764: 762: 755: 753: 751: 745: 743: 739: 738:ITU-R BS.1770 735: 731: 727: 722: 718: 716: 712: 704: 702: 700: 696: 692: 688: 684: 680: 676: 675:amateur radio 671: 669: 665: 661: 653: 651: 649: 645: 641: 640:side-chaining 636: 632: 630: 626: 616: 609: 607: 605: 600: 594:Public spaces 593: 588: 586: 584: 583:audio latency 575: 573: 571: 563: 561: 559: 551: 549: 547: 538: 536: 528: 521: 519: 517: 513: 507: 503: 500: 496: 487: 480: 478: 476: 472: 447: 440: 436: 428: 426: 424: 420: 416: 411: 401: 397: 393: 389: 381: 379: 372: 365: 363: 361: 357: 353: 349: 344: 342: 338: 334: 330: 326: 322: 321:photoresistor 318: 314: 309: 307: 303: 299: 295: 286: 279: 277: 275: 271: 269: 265: 261: 259: 255: 251: 246: 244: 240: 236: 232: 230: 226: 222: 218: 214: 212: 211:dynamic range 198: 186: 177: 167: 165: 163: 159: 155: 151: 147: 143: 139: 134: 132: 128: 124: 120: 116: 111: 109: 105: 101: 97: 93: 92:dynamic range 89: 85: 81: 77: 73: 69: 65: 58: 54: 50: 45: 41: 37: 33: 19: 2884: 2849:Loudness war 2816:Ghost singer 2791:Orchestrator 2786:Horn section 2669:Reverse echo 2629:Equalization 2599:Delay effect 2593: 2549:Punch in/out 2544:Ping-ponging 2512:Effects unit 2507:Effects loop 2497:Audio mixing 2487:Audio filter 2381:cite journal 2370:. Retrieved 2357: 2340: 2336: 2330: 2277: 2273: 2263: 2252:. Retrieved 2248: 2238: 2226:. Retrieved 2214: 2207: 2190: 2186: 2165:, retrieved 2160: 2154: 2144:, retrieved 2135: 2129: 2118:. Retrieved 2114: 2104: 2092:. Retrieved 2087: 2078: 2067:. Retrieved 2063: 2039:the original 2026: 1965: 1961: 1955: 1947: 1941:. Retrieved 1931: 1904: 1898: 1887:. Retrieved 1883: 1874: 1863:. Retrieved 1859:Out-Law News 1858: 1849: 1839: 1820:, retrieved 1814: 1791:. Retrieved 1787: 1777: 1765:. Retrieved 1758: 1749: 1722: 1716: 1704:. Retrieved 1699: 1690: 1678:. Retrieved 1674: 1665: 1656: 1634: 1622: 1614:the original 1609: 1599: 1591: 1585:. Retrieved 1576: 1566: 1555:. Retrieved 1551: 1541: 1530:. Retrieved 1525: 1515: 1506: 1494: 1483:. Retrieved 1479: 1469: 1458:. Retrieved 1444: 1440: 1427: 1414:Kadis, Jay. 1404:Kadis, Jay. 1399: 1366: 1327: 1320: 1305:Tone mapping 1268: 1248: 1244: 1224: 1220: 1211: 1191: 1181: 1178:crest factor 1167: 1162: 1160: 1140: 1122: 1108: 1088: 1073: 1069:filter banks 1058: 1054: 1044: 1040: 1034: 1009:equalization 1001:disc jockeys 993: 924: 919: 915: 914: 907: 885: 870: 862:Hearing aids 860: 852:Gain pumping 850: 828: 818: 809:loudness war 790: 787:Loudness war 759: 749: 746: 741: 723: 719: 711:broadcasting 708: 705:Broadcasting 677:that employ 672: 657: 637: 633: 621: 601: 597: 579: 570:make-up gain 569: 567: 564:Make-up gain 557: 555: 542: 533: 515: 511: 508: 504: 498: 494: 492: 474: 470: 448: 434: 432: 422: 418: 412: 387: 385: 377: 345: 341:diode bridge 325:incandescent 316: 313:Vacuum tubes 310: 305: 302:feed-forward 301: 297: 291: 273: 272: 263: 262: 257: 256:. Expansion 253: 249: 247: 242: 238: 234: 233: 224: 220: 216: 215: 208: 175: 154:broadcasting 135: 114: 112: 100:broadcasting 88:audio signal 83: 71: 70:) or simply 67: 63: 62: 40: 2839:Click track 2823:Vocal coach 2766:Backup band 2746:professions 2720:Turntablism 2594:Compression 2579:Pitch shift 2539:Overdubbing 2479:Engineering 2142:, p. 3 1217:Compressors 779:The Beatles 317:variable-mu 158:advertising 131:attack time 84:compressing 72:compression 2907:Categories 2771:Bandleader 2730:Xenochrony 2685:aesthetics 2649:Noise gate 2609:Distortion 2571:processing 2534:Microphone 2372:2019-11-04 2254:2013-10-24 2167:2023-12-29 2146:2021-11-08 2120:2015-03-16 2069:2015-03-16 2064:SonicScoop 1975:1608.04363 1943:2021-05-25 1914:1565939972 1889:2013-12-07 1865:2019-11-03 1822:2019-11-03 1788:SVG Europe 1702:. May 2009 1675:Sage Audio 1587:2012-12-21 1557:2019-07-31 1532:2016-08-29 1485:2019-11-03 1460:2019-06-06 1391:1011721139 1347:1003326401 1312:References 987:media help 920:brick wall 824:companding 815:Other uses 785:See also: 765:Over-usage 687:modulation 625:rock music 576:Look-ahead 298:side-chain 268:noise gate 115:compressor 2681:Practices 2584:Auto-Tune 2559:Tape loop 2529:Diffusion 2287:1205.5651 2000:1070-9908 1741:842936687 1509:(Manual). 1449:CiteSeerX 1174:EBU R 128 1170:RMS power 1021:bass drum 1017:sibilance 931:PA system 927:bass amps 846:basslines 842:rackmount 801:mastering 775:Something 756:Marketing 730:EBU R 128 668:equalized 664:de-essing 660:sibilance 648:basslines 629:pop music 512:automatic 457:∞ 388:threshold 382:Threshold 358:, and in 258:increases 254:expansion 164:systems. 150:mastering 106:and some 2756:Arranger 2715:Sampling 2639:Flanging 2517:Talk box 2322:22837813 2228:July 14, 1923:42475568 1577:RaneNote 1273:See also 1188:Limiters 1145:support 1095:loudness 1025:headroom 1013:de-esser 997:Eventide 890:Limiting 881:earplugs 877:earmuffs 866:binaural 805:clipping 793:loudness 742:EBU Mode 471:limiting 392:decibels 306:feedback 264:Downward 250:opposite 217:Downward 140:, as an 123:limiting 2659:Pumping 2624:Ducking 2569:Signal 2413:at the 2313:3405292 2292:Bibcode 2280:: 521. 2008:3537408 1980:Bibcode 1793:8 April 1767:8 April 1579:(155). 1300:Squelch 1147:plugins 1131:guitars 1005:ducking 910:limiter 904:Limiter 499:release 423:release 229:limiter 2859:Medley 2854:Mashup 2664:Reverb 2654:Phaser 2320:  2310:  2094:17 May 2006:  1998:  1921:  1911:  1739:  1729:  1706:12 May 1680:12 May 1451:  1389:  1379:  1345:  1335:  1127:vocals 1115:mixing 797:mixing 495:attack 475:attack 419:attack 408:  404:  339:and a 280:Design 274:Upward 235:Upward 146:mixing 142:effect 80:sounds 74:is an 2874:Remix 2832:Other 2742:Roles 2700:Lo-fi 2603:STEED 2428:from 2282:arXiv 2219:(PDF) 2140:(PDF) 2042:(PDF) 2031:(PDF) 2004:S2CID 1970:arXiv 1631:(PDF) 1583:: 6–7 1503:(PDF) 1437:(PDF) 1419:(PDF) 1409:(PDF) 1141:Some 925:Some 856:dance 777:" by 683:DXing 654:Voice 642:. In 435:ratio 429:Ratio 415:below 354:, in 331:, or 243:above 239:below 225:below 221:above 168:Types 127:ratio 59:436c. 57:Altec 2394:help 2318:PMID 2230:2011 2096:2021 1996:ISSN 1919:OCLC 1909:ISBN 1795:2020 1769:2020 1737:OCLC 1727:ISBN 1708:2010 1682:2020 1387:OCLC 1377:ISBN 1343:OCLC 1333:ISBN 1129:and 1113:and 1003:for 929:and 879:and 799:and 724:The 697:and 589:Uses 396:dBFS 156:and 148:and 2618:ADT 2345:doi 2308:PMC 2300:doi 2195:doi 1988:doi 1373:149 1067:or 1043:or 627:or 514:or 400:dBu 329:LED 90:'s 86:an 68:DRC 49:Dbx 2909:: 2776:DJ 2385:: 2383:}} 2379:{{ 2341:62 2339:. 2316:. 2306:. 2298:. 2290:. 2276:. 2272:. 2247:. 2191:62 2189:. 2175:^ 2086:. 2062:. 2050:^ 2033:. 2016:^ 2002:. 1994:. 1986:. 1978:. 1966:24 1964:. 1946:. 1917:. 1882:. 1857:. 1830:^ 1803:^ 1786:. 1757:. 1735:. 1698:. 1673:. 1655:. 1643:^ 1633:. 1608:. 1590:. 1575:. 1550:. 1505:. 1478:. 1445:60 1443:. 1439:. 1385:. 1375:. 1355:^ 1341:. 1172:, 1133:. 1063:, 1027:. 848:. 811:. 701:. 439:dB 343:. 327:, 133:. 110:. 102:, 98:, 2620:) 2616:( 2605:) 2601:( 2463:e 2456:t 2449:v 2396:) 2392:( 2351:. 2347:: 2324:. 2302:: 2294:: 2284:: 2278:2 2257:. 2232:. 2201:. 2197:: 2123:. 2098:. 2072:. 2010:. 1990:: 1982:: 1972:: 1925:. 1892:. 1868:. 1797:. 1771:. 1743:. 1710:. 1684:. 1659:. 1560:. 1535:. 1488:. 1463:. 1421:. 1411:. 989:. 394:( 66:( 38:. 20:)

Index

Compression (audio)
Gain compression
Audio compression (data)

Dbx
Empirical Labs Distressor
Altec
audio signal processing
sounds
audio signal
dynamic range
sound recording and reproduction
broadcasting
live sound reinforcement
instrument amplifiers
digital audio workstation
limiting
ratio
attack time
public address systems
effect
mixing
mastering
broadcasting
advertising
noise reduction
Downward compression diagram
Upward compression diagram
dynamic range
limiter

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