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The EQuivocate 2 is an upcoming dynamic graphic equalizer plugin with match EQ, adjustable frequency range and scaling for cosine-shaped filter banks, and an optional frequency response view revealing a FFT spectrum analyzer. It is a successor to EQuivocate and it brings a lot of changes like addition of the optional dynamic EQ in addition to static match, cosine-shaped filter banks for smoother frequency response while maintaining equal gain properties. It is being developed by Newfangled Audio and distributed by Eventide Audio with no set release date.

Background[]

It is well known that human auditory system is non-linear in terms of frequency resolution. Likewise, the auditory perception is neither linear nor logarithmic. Because of that, most ML-related audio applications like speech recognition and feature extraction algorithms like MFCC tends to use Mel scale, but that does not mean that graphic equalizers and massively multiband compressors/expanders/gates should use auditory frequency scales.

Often times when a narrow boost or even a cut on bass frequencies using linear-phase equalizers of any kind can lead to undesirable pre-ringing artifacts, or a match EQ with precise frequency resolution and/or little to no smoothing can sound unnatural even if it does use third-octave filter banks instead of FFT, which smoothing are rarely needed anyway.

On the other hand, there are some drawbacks of using an auditory frequency scale as spacing for graphic EQs, such as a reduced frequency resolution on bass frequencies, limiting the ability to tame unwanted resonances in sub-bass regions. Just because an auditory frequency scale doesn't mean it does not sound better on all cases. If other things like psychoacoustic-related algorithms on dynamics processing parts are added alongside auditory frequency spacing, most tracks and SFX sounds good with just dynamic EQ and/or compression.

Newfangled EQuivocate 2's dynamic EQ are designed to complement with static EQ adjustments including EQ match. It uses a sophisticated algorithm based on psychoacoustic model to dynamically adjust the frequency response while applying static EQ adjustments at the same time.

Dynamic EQ[]

The new dynamic equalizer introduced in EQuivocate 2 allows EQ adjustments to automatically adapt to incoming signal, using sophisticated algorithm based on signal-to-mask ratio and noise-to-mask ratio. It works similarly to Soundtheory Gullfoss and Voxengo TEOTE as it changes the EQ gain but not perceived dynamic range in regards to input. It is able to complement EQ match.

The dynamic EQ amount can be adjusted. Higher values means more dynamic adjustments and negative values means opposite adjustment.

Frequency range and scale[]

New in EQuivocate 2, the frequency range and scale can now be adjusted in addition to changing center frequency for each band.

The frequency scale for filter banks, both shape and spacing is Mel scale by default, but it can be changed to other scales like Bark and ERB. Note that it can't be 0Hz if the logarithmic scale is selected, this is because logarithm of zero is equals to negative infinity.

Audio filterbank processing[]

By default, EQuivocate 2 uses linear-phase FIR crossover filters, which does not introduce phase shifts, but incurs a latency (depending on user-defined impulse response length) and pre-ringing artifacts especially when working with logarithmic scale or narrow frequency range. The new minimum-phase mode uses a sophisticated algorithm to approximate the frequency response of summed cosine-shaped filters including dynamic adjustments, while having zero-latency and free of pre-ringing at the cost of phase shifts.

The same sophisticated algorithm is also available on Newfangled Compress multiband dynamics processor and Punctuate 2 spectral transient/sustain shaper.

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