title: Beamforming with a circular microphone array for localization of environmental noise sources.
abstract: It is often enough to localize environmental sources of noise from different directions in a plane. This can be accomplished with a circular microphone array, which can be designed to have practically the same resolution over 360°. The microphones can be suspended in free space or they can be mounted on a solid cylinder. This investigation examines and compares two techniques based on such arrays, the classical delay-and-sum beamforming and an alternative method called circular harmonics beamforming. The latter is based on decomposing the sound field into a series of circular harmonics. The performance of the two signal processing techniques is examined using computer simulations, and the results are validated experimentally.
authors.affiliation: Department of Electrical Engineering, Technical University of Denmark, Orsteds Plads 352, 2800 Kongens Lyngby, Denmark. etr@elektro.dtu.dk
authors.forename: Elisabet
authors.initials: E
authors.lastname: Tiana-Roig
authors.forename: Finn
authors.initials: F
authors.lastname: Jacobsen
authors.forename: Efrén Fernández
authors.initials: EF
authors.lastname: Grande
mesh_terms: D000162:Acoustics / Q000295:instrumentation*; D003198:Computer Simulation; D004777:Environment; D004867:Equipment Design; D005583:Fourier Analysis; D008962:Models, Theoretical; D009038:Motion; D009622:Noise; D011312:Pressure; D015203:Reproducibility of Results; D012815:Signal Processing, Computer-Assisted; D013016:Sound; D013018:Sound Spectrography; D014160:Transducers, Pressure