Abstract
Room response equalization aims at improving the sound reproduction in rooms by applying advanced digital signal processing techniques to design an equalizer on the basis of one or more measurements of the room response. This topic has been intensively studied in the last 40 years, resulting in a number of effective techniques facing different aspects of the problem. This review paper aims at giving an overview of the existing methods following their historical evolution, and discussing pros and cons of each approach with relation to the room characteristics, as well as instrumental and perceptual measures. The review is concluded by a discussion on emerging topics and new trends.
Highlights
When sound is reproduced by one or more loudspeakers, the perception of the desired auditory illusion is modified by the listening environment
One important aspect is the evaluation of Room response equalization (RRE) results, considering instrumental measures or subjective listening tests
The former aims at measures which are in relation with the goal of the procedure—for example, quantifying the similarity between the target function and the equalization result
Summary
When sound is reproduced by one or more loudspeakers, the perception of the desired auditory illusion is modified by the listening environment. To some extent this may be seen as positive, since spaciousness and depth is added, but the environment and the sound reproduction system can introduce undesired artifacts. A non-ideal reproduction system may even add some artifacts (e.g., frequency band extension, nonlinearities) to the original sound. Room response equalization (RRE) has been studied in theory and applied in practice for improving the quality of sound reproduction contrasting the detrimental effects of the room environment and reproduction system. In an RRE system, the room transfer function (RTF)
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