Mason Blake
Sound compression is a technique used in recording and mixing to reduce the dynamic range of a signal by decreasing the volume of loud sounds and increasing the volume of quiet sounds. This is achieved by automatically turning down the gain when the signal exceeds a predetermined threshold, also known as the compression threshold. Compression can be used to prevent gain overload by controlling the volume of the signal and ensuring it stays within a certain range. The amount of gain reduction applied during compression depends on various factors such as the desired sound, the dynamic range of the source, and the purpose of the element in the mix. Serial compression, which utilizes two different compressors in a signal chain, is often used to stabilize the dynamic range and compress stronger peaks, resulting in a more natural-sounding compression. Additionally, brick wall limiting, with its high ratio and fast attack time, ensures that the audio signal never exceeds the amplitude of the threshold, preventing overload and potential speaker damage.
| Characteristics | Values |
|---|---|
| Purpose of sound compression | To reduce the difference between the loudest and quietest parts of a piece of music |
| How it works | Automatically turns down the gain when the signal gets past a predetermined level |
| Serial compression | Uses two fairly different compressors in a signal chain, one to stabilize the dynamic range and the other to compress stronger peaks |
| Stereo linking mode | Applies the same amount of gain reduction to both the left and right channels to prevent image shifting |
| Gain reduction | Every 5dB of gain reduction, the peak level is reduced by 5dB, but the low-level sounds remain unchanged |
| Multiband compression | Used for mastering when regular compression is not enough |
| Over-compression | Removes all emotional accents and makes the track tiresome |
| Limiter | Has almost infinite compression, used to prevent overload |
| Compressor | Has adjustable compression, used for more subtle dynamic correction |
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What You'll Learn
Serial compression
The order of the compressors matters, as each level of processing builds on the previous layer. Serial compression provides greater control over the dynamics of the track, allowing for a more consistent, smooth, and punchy sound. It is particularly useful for vocals, bass, and drums, which are vital to most arrangements but can vary greatly in dynamics. By using one compressor with a faster attack and release to tame peaks, and another to smoothen out longer phrases, serial compression helps to stabilise the track to the groove of the music.
Additionally, serial compression can be used within parallel compression, blending an unprocessed vocal track with a processed vocal track using multiple stacked compressors. This approach offers a range of sonic possibilities and allows for fine-tuning and adjustments to the chain. However, it is important to ensure that each added compressor has a distinct purpose and actively contributes to the overall sound, as it is easy to overwhelm a mix with too much processing.
Overall, serial compression is a versatile technique that provides engineers and producers with greater control over the dynamics and tone of a track, helping to create a more polished and professional sound.
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Stereo linking mode
Compression is a technique used in sound recording and mixing to reduce the difference between the loudest and quietest parts of a piece of music. It does this by automatically turning down the gain when the signal exceeds a predetermined level. When processing stereo signals, it is important to ensure that both channels are treated equally, otherwise, the stereo image will wander if one channel receives more compression than the other. This is where stereo linking mode comes in.
Some plugins offer a knob for stereo link rather than a switch, allowing for a smooth mix between stereo link and no link. This variable linking can be adjusted depending on the gain changes, with the program linking less in the case of brief small gain changes, and linking more in the case of longer big gain changes. This type of linking is sometimes referred to as partial linking or classic stereo compression, where the left channel reacts to the left channel and a percentage of the right channel, and vice versa.
Stereo linking can make things sound less stereo, or more mono, depending on the perception of "stereo-ness". It is important to consider the effect of stereo linking on different types of signals, such as coincident pair overheads and spaced pair room mics, as the stereo cues used by our brains to infer the position of elements in the mix may differ.
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Limiting and compressors
Compressors and limiters are used in audio engineering to manage the dynamic range of a sound source, preventing overload and gain distortion. They are particularly useful in live performances where sudden surges in volume can occur, and in recorded music to even out erratic vocals and guitars.
A compressor automatically turns down the gain when the signal exceeds a predetermined level, reducing the difference between the loudest and quietest parts of a piece of music. This is achieved by monitoring the signal level electronically and following the envelope of the signal using a part of the circuit known as the 'side chain'. The compressor reacts much faster and with greater precision than a human operator, bringing excessive level deviations under control almost instantaneously.
The amount of gain reduction applied by a compressor is typically in the range of 1-12dB, with 12dB being a common amount that can sound great in the right context. However, it is important to use one's ears and not just rely on the numbers, as over-compression can kill the dynamics and make the sound flat and tiresome. Serial compression, which uses two different compressors in a signal chain, can be used to achieve heavy compression while still sounding natural.
A limiter is a type of compressor with almost infinite compression and a very high ratio and fast attack time, ensuring that an audio signal never exceeds the amplitude of the threshold. Limiters are commonly used at the end of a master chain to prevent overload and distortion, particularly in live sound and broadcast applications.
Both compressors and limiters play a crucial role in managing gain and preventing overload, with compressors being used for more subtle dynamic correction and limiters providing a safety net to catch excessive peaks.
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Gain reduction
The amount of gain reduction applied depends on the dynamic range of the audio, the desired sound, and the element being processed. For example, 12dB of gain reduction can be effective in certain contexts, but may be inappropriate for other types of audio, such as an "in-your-face rock vocal". In addition, the attack and release settings of the compressor can be more important than the amount of gain reduction in determining the final sound.
In hearing aids, compression is used to bring the audio volume into the listener's hearing range, and binaural compression helps the patient perceive the direction from which sound is coming. In hearing protection, compressors are used to let sounds at ordinary volumes be heard while protecting from sudden volume peaks that could be damaging.
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Over-compression
Compression is a way of processing audio to reduce its dynamic range—the difference between the loudest and quietest parts. When a track is compressed, the peaks of the signal are reduced, and the quieter parts are made louder. This results in a more consistent sound and can help a track sit nicely in a mix.
To avoid over-compression, it is important to understand the various parameters of compression and their effects on the final sound. The attack and release settings, for example, can have a significant impact on the way compression sounds. Additionally, it is important to use compression sparingly and only when necessary. Serial compression, which uses two different compressors in a signal chain, can be a useful technique to shape the sound in stages, but it can also lead to over-compression if not used carefully.
One way to spot over-compression is by looking at the waveform. A lack of noticeable transients in the waveform can indicate that the audio has been over-compressed. It is also important to listen for any loss of clarity or contrast in the sound, as this can be a sign of over-compression.
In conclusion, over-compression can negatively impact the sound of a track, making it unpleasant and difficult to listen to. By understanding the parameters of compression and using it sparingly, over-compression can be avoided, resulting in a more natural and dynamic sound.
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Frequently asked questions
Sound compression reduces the difference between the loudest and quietest parts of a piece of music by automatically turning down the gain when the signal gets past a predetermined level.
Gain overload occurs when there is a sudden surge in volume, causing an audio signal to exceed the amplitude of the threshold.
Yes, sound compression can prevent gain overload by reducing the dynamic range of the audio signal. Serial compression, for example, uses two compressors in a signal chain to stabilize the dynamic range and compress stronger peaks.
