Circular Loudspeaker Array with Controllable Directivity

Martin Møller; Martin Olsen; Finn T. Agerkvist; Jakob Dyreby; Gert Munch

Circular Loudspeaker Array with Controllable Directivity

Martin Møller
, Martin Olsen
, Finn T. Agerkvist
, Jakob Dyreby
, Gert Munch

Bang & Olufsen A/S

Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research

Abstract

Specific directivity patterns for circular arrays of loudspeakers can be achieved by utilizing the concept of phase-modes, which expands the directivity pattern into a series of circular harmonics. This paper investigates the applicability of this concept applied on a loudspeaker array on a cylindrical baffle, with a desired directivity pattern, which is specified in the frequency interval of 400–5000 Hz. From the specified frequency independent directivity pattern filter transfer functions for each loudspeaker are determined. The sensitivity of various parameters, related to practical implementation, is also investigated by introducing filter errors for each array element. Measurements on a small scale model using 2 inch drivers are compared with simulations, showing good agreement between experimental and predicted results.

Original language	English
Title of host publication	Proceedings of the 128th Audio Engineering Society Convention
Publication date	2010
Publication status	Published - 2010
Event	128th Audio Engineering Society Convention - London, United Kingdom Duration: 22 May 2010 → 25 May 2010 Conference number: 128 http://www.aes.org/events/128/

Conference

Conference	128th Audio Engineering Society Convention
Number	128
Country/Territory	United Kingdom
City	London
Period	22/05/2010 → 25/05/2010
Internet address	http://www.aes.org/events/128/

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@inproceedings{9b97a1a89178464f8bd37973d1a2d8ca,

title = "Circular Loudspeaker Array with Controllable Directivity",

abstract = "Specific directivity patterns for circular arrays of loudspeakers can be achieved by utilizing the concept of phase-modes, which expands the directivity pattern into a series of circular harmonics. This paper investigates the applicability of this concept applied on a loudspeaker array on a cylindrical baffle, with a desired directivity pattern, which is specified in the frequency interval of 400–5000 Hz. From the specified frequency independent directivity pattern filter transfer functions for each loudspeaker are determined. The sensitivity of various parameters, related to practical implementation, is also investigated by introducing filter errors for each array element. Measurements on a small scale model using 2 inch drivers are compared with simulations, showing good agreement between experimental and predicted results.",

author = "Martin M{\o}ller and Martin Olsen and Agerkvist, \{Finn T.\} and Jakob Dyreby and Gert Munch",

year = "2010",

language = "English",

booktitle = "Proceedings of the 128th Audio Engineering Society Convention",

note = "128th Audio Engineering Society Convention, AES'10 ; Conference date: 22-05-2010 Through 25-05-2010",

url = "http://www.aes.org/events/128/",

}

TY - GEN

T1 - Circular Loudspeaker Array with Controllable Directivity

AU - Møller, Martin

AU - Olsen, Martin

AU - Agerkvist, Finn T.

AU - Dyreby, Jakob

AU - Munch, Gert

N1 - Conference code: 128

PY - 2010

Y1 - 2010

N2 - Specific directivity patterns for circular arrays of loudspeakers can be achieved by utilizing the concept of phase-modes, which expands the directivity pattern into a series of circular harmonics. This paper investigates the applicability of this concept applied on a loudspeaker array on a cylindrical baffle, with a desired directivity pattern, which is specified in the frequency interval of 400–5000 Hz. From the specified frequency independent directivity pattern filter transfer functions for each loudspeaker are determined. The sensitivity of various parameters, related to practical implementation, is also investigated by introducing filter errors for each array element. Measurements on a small scale model using 2 inch drivers are compared with simulations, showing good agreement between experimental and predicted results.

AB - Specific directivity patterns for circular arrays of loudspeakers can be achieved by utilizing the concept of phase-modes, which expands the directivity pattern into a series of circular harmonics. This paper investigates the applicability of this concept applied on a loudspeaker array on a cylindrical baffle, with a desired directivity pattern, which is specified in the frequency interval of 400–5000 Hz. From the specified frequency independent directivity pattern filter transfer functions for each loudspeaker are determined. The sensitivity of various parameters, related to practical implementation, is also investigated by introducing filter errors for each array element. Measurements on a small scale model using 2 inch drivers are compared with simulations, showing good agreement between experimental and predicted results.

M3 - Article in proceedings

BT - Proceedings of the 128th Audio Engineering Society Convention

T2 - 128th Audio Engineering Society Convention

Y2 - 22 May 2010 through 25 May 2010

ER -

Circular Loudspeaker Array with Controllable Directivity

Abstract

Conference

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