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All Projects → DanielRudrich → SimpleCompressor

DanielRudrich / SimpleCompressor

Licence: GPL-3.0 license
Code and theory of a look-ahead compressor / limiter.

Programming Languages

C++
36643 projects - #6 most used programming language

Labels

compressoraudio-processing

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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 😉

What's in the box?

Clicking the following links brings you directly to the docs.

This repository includes:

  • C++ classes
    • computation of the gain reduction from a given side-chain signal
    • look-ahead processing of the gain reduction samples
  • JUCE class: a compressor class which wraps the gain reduction class into a JUCE audio processor
  • JUCE example projects
    • 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

References

The compressor class is mainly based on this presentation:

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

Screenshot of the LookAheadCompressor plug-in

alt text

1 not based on scientific data, but estimated rather subjectively.
2 yeah, all of them.
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