Baffled circular loudspeaker array with broadband high directivity

Kolundžija, Mihailo; Faller, Christof; Vetterli, Martin

doi:10.1109/icassp.2010.5496204

Cited by 8 publications

(7 citation statements)

References 9 publications

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“…In general, the corresponding velocity spectra, V l n (k z ), are determined with the operator W defined in Eq. (6).…”

Section: Velocity Spectrum Of An Arbitrary Wedge Arraymentioning

confidence: 99%

“…for line arrays in public address (PA) applications, 2D Wave Field Synthesis (WFS) etc.) [1,2], spherical arrays [3][4][5] and cylindrical/circular arrays [6][7][8]. Linear arrays are probably the most visible/available to the public, ranging from PA applications to personal audio systems in the form of sound bars.…”

Section: Introductionmentioning

confidence: 99%

“…Linear arrays are probably the most visible/available to the public, ranging from PA applications to personal audio systems in the form of sound bars. Cylindrical/circular and spherical arrays are often found in the form of large installations for Wave Field Synthesis (WFS) or Higher Order Ambisonics (HOA) systems [3][4][5][9][10][11][12], but also in compact form for sound sources with directivity control [6,7,[13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…The most classic form is probably the generation of a sound field in a dedicated reproduction area with holophony as the objective [2,3,8]. Acoustic contrast control and pressure matching, as well as acoustic beamforming are also forms of sound field control [6,[17][18][19][20]. All these techniques can (but do not have to) be derived on the basis of wave propagation models, between which the physical accuracy may vary for a given environment.…”

Section: Introductionmentioning

confidence: 99%

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An analytical model for wedge-shaped acoustic arrays

Hoffmann

Williams

Fazi

et al. 2019

Journal of Sound and Vibration

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This work presents the derivation of a 3D sound field model for the pressure field radiated from loudspeaker arrays in acoustic wedge spaces. These wedge arrays are described by their normal velocity profile at a given boundary. Using this model, a suitable beamforming technique with two different beam patterns is derived based on a mode-matching approach. The model is then used to study the beamforming performance as a function of frequency and distance from the array by analysing the Arc Radial Functions introduced in this work. The theory is tested on the basis of simulation results for different wedges and validated through holographic measurements made with a hemi-cylindrical array. It is found that for a large distance, a far-field approximation of the model can be used to drive the array, whereas for a short distance, the general model must be applied to yield accurate results.

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“…In general, the corresponding velocity spectra, V l n (k z ), are determined with the operator W defined in Eq. (6).…”

Section: Velocity Spectrum Of An Arbitrary Wedge Arraymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

An analytical model for wedge-shaped acoustic arrays

Hoffmann

Williams

Fazi

et al. 2019

Journal of Sound and Vibration

View full text Add to dashboard Cite

show abstract

“…Directivity and sound field control for loudspeaker arrays have been developed over a long time to be applied, for instance, in personal audio, public address, and surround sound systems [1][2][3][4][5][6][7][8][9][10]. In addition, directivity control, also known as beamforming in the field of microphone array processing, is widely studied for speech enhancement, sound source separation, and direction of arrival estimation [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Sidelobe suppression by desired directivity pattern optimization for a small circular loudspeaker array

Sato

Hori

2018

Acoust. Sci. & Tech.

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Directivity control using a loudspeaker array is widely studied for various applications. Suppressing sidelobe levels is important for applications such as personal audio systems. In this paper, we propose a filter design method using a window function shape as the desired directivity pattern to reduce the sidelobe levels. The proposed method consists of three steps. The first step defines a cost function with a criterion for the directivity pattern. Next, filter coefficients for each loudspeaker are calculated and stored while changing the window function shape of the desired directivity pattern. Finally, we determine the optimum filter coefficients having the best performance of the cost function by using a full-search algorithm at each frequency. We conducted directivity experiments with a real six-element circular loudspeaker array having a radius of 0.055 m and evaluated its directivity to confirm the performance of the proposed method. The results, which were compared with those obtained from a conventional method, showed that the maximum sidelobe level improved by about 2 dB, although the beam was wide. We verified that using the window function shape as the desired directivity pattern is more effective than using the conventional method for sidelobe suppression.

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Sound Field Reproduction With a Cylindrical Loudspeaker Array Using First Order Wall Reflections

Maeda¹,

Fazi²,

Hoffmann³

2021

IEEE/ACM Trans. Audio Speech Lang. Process.

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Sound field reproduction is a promising technology for reproducing a desired sound field over a specific area. However, several practical challenges exist, such as the requirement for a large number of loudspeakers and the degradation of spatial reproduction accuracy due to room reflections. This work proposes a sound field reproduction method based on a cylindrical loudspeaker array that is used to both radiate sound directly towards the listener and take advantage of controlled first-order reflections from the room's walls. The sound field corresponding to one or more virtual sound sources is created by the combination of the direct and reflected sound at the listener position. As long as the lateral walls generate welldefined specular reflections, the simple model of the reverberant field with the proposed formulation enables this method to work without elaborate acoustical measurements. Two approaches with different concepts of controlling the array are compared and their mathematical equivalence is shown. To evaluate the performance, both simulations and experiments were conducted, showing a good agreement with theory.

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Baffled circular loudspeaker array with broadband high directivity

Cited by 8 publications

References 9 publications

An analytical model for wedge-shaped acoustic arrays

An analytical model for wedge-shaped acoustic arrays

Sidelobe suppression by desired directivity pattern optimization for a small circular loudspeaker array

Sound Field Reproduction With a Cylindrical Loudspeaker Array Using First Order Wall Reflections

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