Express Paper
Measurement Techniques for Dynamic Equalizers
AES Convention 155 · Paper 151 · October 2023
Abstract
A Dynamic Equalizer is a tool for equalizing an audio signal only under certain conditions of the input signal amplitude: for example, when the input signal exceeds or goes below a predefined threshold. The Dynamic equalizer is a quite modern and well diffused tool in the music production industry but, as well as for compressors and limiters, can find a specific usage in the protection/enhancement of professional audio equipment. Such interventions can be done, for example, to compensate for power compression tonal effects at high levels, or to “fill” the under-perceived spectrum extremes at low levels (that is an automatic loudness filter). To accomplish this purpose, the settings of a Dynamic Equalizer should be based on precise quantitative information, possibly assessed by loudspeaker measurements, and the behaviour of the Dynamic Equalizer itself must be quantitatively characterized. It appears that there are no established methods or standards for measuring and validating a Dynamic Equalizer. In this presentation, some methods for validating and describing the audio process of Dynamic Equalizers designed for pro audio equipment enhancement will be investigated.
