Fourier Compressor: The Next Generation of Audio Processing

Reflex Acoustics’ newest plugin, Fourier Compressor, offers a fresh take on audio compression. This innovative tool harnesses the power of Fast Fourier Transform (FFT) mathematics to process audio in ways previously unavailable to music producers and audio engineers. The plugin splits incoming audio into 100 distinct frequency bands and processes each through a specialized mid-side parallel compressor.

What Makes Fourier Compressor Different

The core technology behind Fourier Compressor sets it apart from traditional audio compressors. Instead of processing the entire audio signal as one unit, it breaks the sound into 100 different frequency bands. This approach gives users unprecedented control over their audio material. The Fast Fourier Transform algorithm handles all the complex mathematical calculations needed to split and recombine the audio signal without creating unwanted artifacts.

Smart Compression Technology

The standout feature of the Fourier Compressor is its automatic threshold detection system. Users no longer need to set compression thresholds for different frequency bands manually. The “Compression” control acts as a master dial that intelligently adjusts how far the thresholds sit below the peaks in the input signal. This intelligent system takes the guesswork out of compression settings while maintaining musical results.

Advanced Time Controls

The plugin offers global Attack and Release controls that affect all frequency bands. These parameters work differently from traditional compressors—the Attack time changes based on the frequency of content being processed. Lower frequencies get longer attack times, while higher frequencies respond more quickly. This frequency-dependent behavior creates natural-sounding results that work well with the source material.

The Release parameter also adapts to the audio content. Users can set a global release time, but the actual release behavior changes based on the processed frequency band. This intelligent approach prevents unwanted pumping effects and maintains the natural character of the sound.

Mid-Side Processing

The Fourier Compressor includes full mid-side processing capabilities. The mid-channel contains the center information of the stereo field, while the side channel handles the stereo content. The plugin processes these channels entirely independently, with no linking between them. This separation gives users total control over the stereo image of their audio material.

The mid-side implementation helps users shape the stereo field of their mixes. They can apply different amounts of compression to the center and sides of their audio, creating width and depth in their productions. This feature proves especially useful when working with full mixes or stereo instrument recordings.

Parallel Processing

The plugin includes a wet/dry mix control for parallel processing. This feature lets users blend the compressed signal with the original unprocessed audio. The mix control uses gain-matching technology to maintain consistent output levels regardless of the mix setting. This approach makes it easy to dial in the perfect amount of compression without worrying about level changes.

Sidechain Processing

External sidechain support allows for creative ducking effects. The plugin includes a 7-millisecond look-ahead feature that helps prevent unwanted artifacts when using sidechain compression. This timing control ensures clean, professional-sounding results when ducking one signal against another.

Level Matching Technology

One of the Fourier Compressor’s most impressive features is its ability to maintain consistent loudness levels. The plugin continuously measures the short-term LUFS (Loudness Units Full Scale) over a three-second window. As users adjust the controls, the plugin automatically compensates to stabilize perceived loudness. This feature makes making objective decisions about compression settings easier without being fooled by volume changes.

Technical Implementation

The Fast Fourier Transform algorithm forms the foundation of Fourier Compressor’s processing engine. This mathematical technique converts audio from the time domain to the frequency domain, allowing for precise frequency-band splitting. The plugin processes these bands individually before recombining them into the final output signal.

The compression algorithm applies different ratio settings based on frequency content. Higher frequencies receive different ratio curves compared to lower frequencies. This frequency-dependent ratio adjustment helps maintain natural dynamics while still achieving effective compression.

Platform Support

Currently, Fourier Compressor supports both Windows and Mac operating systems. It comes in VST3 and AU plugin formats, making it compatible with most modern digital audio workstations. Reflex Acoustics has announced plans to release an AAX version, bringing Fourier Compressor to Pro Tools users.

Applications in Audio Production

Mixing

Audio engineers can use Fourier Compressor on individual tracks or entire mixes. The frequency-band splitting effectively controls complex audio material like full drum kits or complete mixes. Intelligent threshold detection helps achieve consistent results across different types of source material.

Mastering

The plugin works well in mastering situations. The precise control over different frequency bands allows mastering engineers to apply compression without equally affecting the entire frequency spectrum. The level-matching features help maintain consistent loudness throughout the mastering process.

Sound Design

Sound designers benefit from the Fourier Compressor’s creative possibilities. Combining frequency-band splitting and mid-side processing opens new ways to shape and manipulate audio. The sidechain feature enables complex modulation effects for creative sound design applications.

Workflow Benefits

The Fourier Compressor simplifies many everyday compression tasks. The automatic threshold detection reduces the time spent adjusting compression settings. The intelligent attack and release behaviors help users achieve professional results quickly. The level-matching feature lets users focus on the sound of the compression rather than constantly adjusting output levels.

Performance Considerations

Fast Fourier Transform processing requires more computer resources than traditional compressors. However, modern computers handle the processing demands without issues. The benefits of the frequency-band approach outweigh the slight increase in CPU usage for most applications.

Industry Impact

The Fourier Compressor represents a new direction in audio processing technology. The combination of FFT analysis, intelligent compression, and advanced features sets new standards for audio plugins. This approach to compression could influence future audio processing tools and change how engineers approach dynamic processing.

Future Development

While the current version offers extensive features, Reflex Acoustics continues development work. The upcoming AAX version will expand the plugin’s reach to Pro Tools users. The company’s commitment to innovation suggests future updates might bring additional features and refinements to the existing processing engine.