Overloud Unveils Fluid Convolution

Next generation IR processing technology      05/02/21

Overloud Unveils Fluid Convolution


Overloud has announced Fluid Convolution, which they say offers substantial improvements to conventional IR processing. Here's the story in their own words...

During NAMM 2021 Overloud announced Fluid Convolution, a new technology utilizing next generation DSP Technology to process Impulse Responses. Fluid Convolution will be the driving technology behind upcoming Overloud cabinets and IR processing products.

What is Fluid Convolution?

Convolution is a mathematical process used to impart the sound of a physical space, an amplifier, or any audio effect onto an input signal such as a guitar. It utilizes impulse responses (IRs), which are sampled "snapshots" taken of an effects source, such as an acoustic space or a piece of audio equipment. Those snapshots are mathematically convolved with the input signal to create the desired effect. Overloud has now advanced this technology with their exclusive Fluid Convolution, which allows them to remove the digital artifacts of conventional IR processing and seamlessly switch between different IRs, all the while lowering the CPU impact.

How Does Fluid Convolution Work?

Convolution at its core is the mathematical process used to apply an IR to an audio stream. When the recorded audio sample rate differs from the IR sample rate, conventional convolution requires resampling of the audio in order to match the two sample rates. This is particularly true when oversampling is used, like in many guitar processors. This leads to an increased CPU load and some audio degradation due to the resampling process. With Fluid Convolution, Overloud stores the IRs as models in the complex frequency domain, eliminating the need for resampling. The resulting sounds have a more natural feel and a lower CPU impact.

The transition between IRs also happens seamlessly -- when changing IRs or tweaking cabinet parameters, traditional audio engines typically jump between different impulses according to the new settings. With Fluid Convolution, everything happens smoothly with no gaps or artifacts and with a new level of realism.

The first Overloud product that will benefit from this new DSP Technology will be TH-U 1.3, which will be released on February 8th. This update will be free for all registered users of any TH-U version, Desktop and Mobile.

Fluid Convolution Features:

  • Reduced CPU Requirements: Overloud has been able to double the length of the IRs, producing a more accurate simulation and a more solid tone
  • More Natural Tone: Thanks to the absence of the resampling stage
  • Seamless Transitions: Changing parameters (like moving the microphones or switching IRs) happens much more smoothly, resulting in a more natural feel when tweaking the models


What Other Overloud Products Will Have Fluid Convolution?

During the Spring of 2021, Overloud will release a new product that will redefine the IR processing. Stay tuned!


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