https://github.com/DanielRudrich/SimpleCompressor

Code and theory of a look-ahead compressor / limiter.
https://github.com/DanielRudrich/SimpleCompressor

audio-processing compressor

Last synced: 3 months ago
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Code and theory of a look-ahead compressor / limiter.

• Host: GitHub
• URL: https://github.com/DanielRudrich/SimpleCompressor
• Owner: DanielRudrich
• License: gpl-3.0
• Created: 2019-08-25T10:42:50.000Z (about 5 years ago)
• Default Branch: master
• Last Pushed: 2024-04-17T05:48:42.000Z (7 months ago)
• Last Synced: 2024-04-24T08:21:42.682Z (7 months ago)
• Topics: audio-processing, compressor
• Language: C++
• Size: 1.15 MB
• Stars: 94
• Watchers: 2
• Forks: 13
• Open Issues: 1
• Metadata Files:
  • Readme: README.md
  • Changelog: ChangeLog.md
  • License: LICENSE

Awesome Lists containing this project

• awesome-juce - SimpleCompressor - ahead compressor / limiter| GPL-3.0|98| 5 years_^🔴| (Effects)

README

        
# SimpleCompressor

Code and theory of a look-ahead compressor/limiter.

### Purpose

The purpose of this project to demonstrate and describe, how a look-ahead limiter works and how to implement it.

About 95%1 of all the sources (books, internet articles and forum threads) recommend a very easy way to implement the look-ahead feature, but unfortunately, 100%2 of those applications will lose their ability to limit the signal's level.

With this, I want to shed a little light on the **mystery of look-ahead limiters** :wink:

### What's in the box?

*Clicking the following links brings you directly to the docs.*

This repository includes:

- [C++ classes](docs/classes.md)

  - computation of the gain reduction from a given side-chain signal

  - look-ahead processing of the gain reduction samples

- [JUCE class](docs/classes.md): a compressor class which wraps the gain reduction class into a JUCE audio processor

- [JUCE example projects](docs/projects.md)

  - SimpleCompressor: making use of the wrapper, implementing a compressor without look-ahead

  - LookAheadCompressor: compressor / limiter with look-ahead feature

- thirdpary classes for multi-channel samples-delays and visualization of the compressor characteristic

- a tutorial: [*How to implement look-ahead limiters*](docs/lookAheadLimiter.md)

### References

The compressor class is mainly based on this presentation:

- http://c4dm.eecs.qmul.ac.uk/audioengineering/compressors/documents/Reiss-Tutorialondynamicrangecompression.pdf

The sample delay class and visualization class is taken from the IEM Plug-in Suite

- website: https://plugins.iem.at

- source-code: https://git.iem.at/audioplugins/IEMPluginSuite

### Screenshot of the LookAheadCompressor plug-in

![alt text](docs/LookAheadCompressor.png)

###### 1 not based on scientific data, but estimated rather subjectively.

###### 2 yeah, all of them.