Digital equalization for audio with application to loudspeakers and rooms.

Abstract

The application of a non-minimum-phase digital filterbank as graphic equalizer is investigated. The filterbank effected a timbral modification of some musical signals even though the magnitude response was unity. For this reason, the filterbank was rejected as a candidate for a high-fidelity graphic equalizer. A new type of equalizing filter is introduced in this work. This filter has the property that its log-magnitude frequency response is approximately linear in the gain term. This filter is used as a building block for an analog and digital parametric equalizer whose frequency response can be adjusted automatically for the use of loudspeaker equalization.