About room response equalization and dereverberation

Karjalainen, Matti; Paatero, Tuomas; Mourjopoulos, John; Hatziantoniou, Panagiotis

doi:10.1109/aspaa.2005.1540200

Cited by 49 publications

(23 citation statements)

References 4 publications

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“…This leads to an exact compensation of the amplitude but not of the phase response. However, in some cases the result of this method can be insufficient due to the remaining error energy in the allpass component [25,26]. This can especially cause the inverse filter to have large boosts at some frequencies, which could overload the system and could also produce a long filter.…”

Section: Equalization Methodsmentioning

confidence: 93%

Discriminability of the placement of supra-aural and circumaural headphones

Paquier

Koehl

2015

Applied Acoustics

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International audienceSeveral studies have shown that differences in the placement of a headphone over a listener’s ears could result in large differences in the measurements of the related transfer function (HPTF). Nevertheless, because of – at least – the non-uniform frequency resolution of human hearing system, large HPTF variations at some frequencies do not necessary imply audible consequences, which were not evaluated by past studies. The present study aims at evaluating the audibility of spectral modifications introduced by slight but realistic changes in the headphone placement over a listener’s ears.Recordings were performed by placing/replacing a headphone on a dummy head. Various headphone models were realistically placed eight times each on the artificial head. Music excerpts and pink noise then were played back over the headphones and recorded with microphones located at the entrance of the blocked ear canal. These recordings were then presented to expert and naïve listeners over a single test headphone. The subjects had to discriminate between stimuli standing for different headphone placements using a 3I3AFC procedure.With the exception of the naïve listeners about one given music excerpt only, subjects were always able to discriminate between the stimuli with respect to their corresponding headphone placement. This indicates that consecutive realistic headphone placements may result in audible differences for the listener. Such a result could raise several issues about the use of headphones for psychoacoustic experiments, especially for multi-session tests

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Section: Equalization Methodsmentioning

confidence: 93%

Discriminability of the placement of supra-aural and circumaural headphones

Paquier

Koehl

2015

Applied Acoustics

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“…A particularly challenging aspect of this is the pre-response errors, or pre-ringings, that occur in mixed phase filter design when the noncausal part of the filter does not exactly match the Room Transfer Function (RTF) at all points in the listening space [1,2]. Recently, a method for cautious mixed phase equalization was introduced which admits control of the pre-ringings [3].…”

Section: Introductionmentioning

confidence: 99%

Variable control of the pre-response error in mixed phase audio precompensation

Brännmark

Åhlén

2009

2009 IEEE Workshop on Applications of Signal Processing to Audio and Acoustics

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We introduce a method for controlling the spatial robustness of a mixed phase loudspeaker equalizer design. The emphasis is on time domain behaviour and the pre-response error that is always present in mixed phase design. Based on measurements from a small spatial region, a mixed phase compensator is regularized to be valid also over a large spatial region. The regularization can be applied gradually to match any size of listener region, while fulfilling a set of constraints for the pre-response error. The compensation thus avoids the unacceptably high pre-response error levels that generally occur outside the measurement region. The proposed compensator design, which is validated on measurements in both small and large spatial regions, is shown to produce excellent results.

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“…Related problems are the shortening of the room impulse response and reduction of the room reverberation, which is called dereverberation [173,178]. It is known that when the reproduced sound in a room becomes boomy, it may not be enough to suppress the level of sound at that frequency with an equalizer, since that mode will still remain ringing, although less loudly.…”

Section: Room Equalizationmentioning

confidence: 99%

“…It is known that when the reproduced sound in a room becomes boomy, it may not be enough to suppress the level of sound at that frequency with an equalizer, since that mode will still remain ringing, although less loudly. A special method for shortening low-frequency room modes is called modal equalization [178,179]. It involves estimating, canceling, and replacing single ringy room modes, which appear at frequencies below about 200 Hz.…”

Section: Room Equalizationmentioning

confidence: 99%

All About Audio Equalization: Solutions and Frontiers

Välimäki

Reiss

2016

Applied Sciences

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Audio equalization is a vast and active research area. The extent of research means that one often cannot identify the preferred technique for a particular problem. This review paper bridges those gaps, systemically providing a deep understanding of the problems and approaches in audio equalization, their relative merits and applications. Digital signal processing techniques for modifying the spectral balance in audio signals and applications of these techniques are reviewed, ranging from classic equalizers to emerging designs based on new advances in signal processing and machine learning. Emphasis is placed on putting the range of approaches within a common mathematical and conceptual framework. The application areas discussed herein are diverse, and include well-defined, solvable problems of filter design subject to constraints, as well as newly emerging challenges that touch on problems in semantics, perception and human computer interaction. Case studies are given in order to illustrate key concepts and how they are applied in practice. We also recommend preferred signal processing approaches for important audio equalization problems. Finally, we discuss current challenges and the uncharted frontiers in this field. The source code for methods discussed in this paper is made available at https://code.soundsoftware.ac.uk/projects/allaboutaudioeq.

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About room response equalization and dereverberation

Cited by 49 publications

References 4 publications

Discriminability of the placement of supra-aural and circumaural headphones

Discriminability of the placement of supra-aural and circumaural headphones

Variable control of the pre-response error in mixed phase audio precompensation

All About Audio Equalization: Solutions and Frontiers

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