AMLT Technology - Curve comparison

AMLT Curves : Low Pass Filter
The AMLT filters are not wrapped near the nyquist frequency

AMLT^® Filtering Technology

AirEQ^® is based on a new and exclusive filtering technology - AMLT - which stands for Analog Matched Linear Transform. This technology represents a new step in the world of digital equalization.

Most of the digital filters on the market have characteristics which are inaccurate in the highs; the closer you get to the Nyquist (or Shannon frequency - half of the sampling frequency), the further these digital filters are from the perfect analog reference filter.
This is because most digital equalizers use the same well-known and classical algorithms, based on standard linear transform. Warping of the filters in the highs is very audible, and does not allow you to have a truly high quality equalization.

AMLT Bell Curve Equalization Comparison
Comparison between a standard digital filter (standard biquad filter), a orfanidis filter and an AMLT filter, for a bell boost.

The AirEQ filters, developed by Eiosis, remove this strong warping by designing filters almost identical to analog ones, whatever the sampling frequency is.

Therefore, whether you work at the sampling frequency of of 44.1, 48 or 96 kHz, the filtering quality will remain the same, up to 20kHz.

Moreover, this filtering quality is obtained with zero-delay processing (which can be crucial for live mixing situations, or other situation where zero-delay is required), plus it is amazingly CPU friendly, without sacrifiying quality. To achieve similar filtering quality, other products on the market often have processing delay and are CPU hogs. AirEQ can easilly be used on each track of a mix, keeping high quality, low CPU usage and zero-delay processing, where other products on the market cannot.

Achieving such characteristics incorporated into the same algorithm was a real challenge, and we plan to incorporate this groundbreaking technology into all our filters.

You can see on the graph below the different types of digital filters compared with AMLT filters and an analog reference.

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