Linear-Phase Octave Graphic Equalizer

Bruschi, Valeria; Välimäki, Vesa; Liski, Juho; Cecchi, Stefania

doi:10.17743/jaes.2022.0014

Cited by 5 publications

(3 citation statements)

References 18 publications

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“…This looks clear in early sub-band audio codecs, in which the input signal is divided into a few bands by a bank of filters, which does not differ from a crossover network [181]. A graphic equalizer [182,183,124,184] is a specific filterbank, which has design questions similar to those of a crossover network. The main difference is that in a graphic equalizer, the band separation is usually between 20 and 40 dB, because the main function is to modify the spectral balance, whereas a crossover network must minimize the band leakage, precisely segregating each band into its own signal, which is consequently processed and played separately.…”

Section: Other Applications Of Crossover Filtersmentioning

confidence: 99%

Crossover Networks: A Review

Cecchi,

Bruschi,

Nobili

et al. 2023

J. Audio Eng. Soc.

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Crossover networks for multi-way loudspeaker systems and audio processing are reviewed, including both analog and digital designs. A high-quality crossover network must maintain a flat overall magnitude response, within small tolerances, and a sufficiently linear phase response. Simultaneously, the crossover filters for each band must provide a steep transition to properly separate the bands, also accounting for the frequency ranges of the drivers. Furthermore, crossover filters affect the polar response of the loudspeaker, which should vary smoothly and symmetrically in the listening window. The crossover filters should additionally be economical to implement and not cause much latency. Perceptual aspects and the inclusion of equalization in the crossover network are discussed. Various applications of crossover filters in audio engineering are explained, such as in multiband compressors and in effects processing. Several methods are compared in terms of the basic requirements and computational cost. The results lead to the recommendation of an all-pass-filter-based Linkwitz-Riley crossover network, when a computationally efficient minimum-phase solution is desired. When a linear-phase crossover network is selected, the throughput delay becomes larger than with minimum-phase filters. Digital linear-phase crossover filters having a finite impulse response may be designed by optimization and implemented efficiently using a complementary structure.

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Section: Other Applications Of Crossover Filtersmentioning

confidence: 99%

Crossover Networks: A Review

Cecchi,

Bruschi,

Nobili

et al. 2023

J. Audio Eng. Soc.

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“…In this work, the effects of the phase distortion are considered to be negligible. If any phase distortion is seen as problematic, a recent linear-phase graphic EQ is an option [21].…”

Section: Variable Loudspeaker Correctionmentioning

confidence: 99%

Loudspeaker Equalization for a Moving Listener

Lindfors¹,

Liski²,

Välimäki³

2022

J. Audio Eng. Soc.

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When a person listens to loudspeakers, the perceived sound is affected not only by the loudspeaker properties but also by the acoustics of the surroundings. Loudspeaker equalization can be used to correct the loudspeaker-room response. However, when the listener moves in front of the loudspeakers, both the loudspeaker response and room effect change. In order for the best correction to be achieved at all times, adaptive equalization is proposed in this paper. A loudspeaker-correction system using the listener's current location to determine the correction parameters is proposed. The position of the listener's head is located using a depthsensing camera, and suitable equalizer settings are then selected based on measurements and interpolation. After correcting for the loudspeaker's response at multiple locations and changing the equalization in real time based on the user's location, a loudspeaker response with reduced coloration is achieved compared to no calibration or conventional calibration methods, with the magnitude-response deviations decreasing from 10.0 to 5.6 dB within the passband of a high-quality loudspeaker. The proposed method can improve the audio monitoring in music studios and other occasions in which a single listener is moving in a restricted space.

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“…In [10], an equalizer containing a comb of linearphase octave filters was proposed, while [11] presented a quasi-linear phase octave graphic equalizer with low latency. The drawbacks of these works are that these equalizers were not used for correc�ng the acous�c proper�es of the room, and they did not dynamically adjust the signal amplitude.…”

Section: Introductionmentioning

confidence: 99%

Real-Time Correction of the Frequency Response of a Public Address System

Dvornyk

2023

Microsyst., Electron. & Acoust.

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Correcting the public address (PA) system during a concert event is one of the crucial tasks in ensuring acoustic comfort. However, the existing approaches to such correction do not allow for real-time adaptation to changes in the acoustic properties of the venue that occur during the event. To address this limitation, this article proposes the use of a multiband compressor. It is shown that a zero-latency VST plugin can serve as a multiband compressor. Pink noise can be used as a test signal for system calibration. The results of testing the proposed algorithm, conducted through model and real-world experiments, demonstrate the feasibility and effectiveness of the proposed approach.

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Linear-Phase Octave Graphic Equalizer

Cited by 5 publications

References 18 publications

Crossover Networks: A Review

Crossover Networks: A Review

Loudspeaker Equalization for a Moving Listener

Real-Time Correction of the Frequency Response of a Public Address System

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