title: The effects of non-cardioid directivity on incidence angle estimation using the polar energy time curve.
abstract: Assessment of desirable reflections and control of undesirable reflections in rooms are best accomplished if the reflecting surfaces are properly localized. Several measurement techniques exist to identify the incident direction of reflected sound, including the useful polar energy time curve (Polar ETC), which requires six cardioid impulse response measurements along the Cartesian axes. The purpose of this investigation is to quantify the incidence angle estimation error introduced into the Polar ETC by non-cardioid microphone directivities. The results demonstrate that errors may be minimized with a cardioid-family microphone possessing a certain range of directivities and by maximizing the measurement signal-to-noise ratio.
authors.affiliation: Acoustics Research Group, Department of Physics and Astronomy, Brigham Young University, N283 Eyring Science Center, Provo, Utah 84602, USA. jamesesplin@byu.edu
authors.forename: J James
authors.initials: JJ
authors.lastname: Esplin
authors.forename: Brian E
authors.initials: BE
authors.lastname: Anderson
authors.forename: Timothy W
authors.initials: TW
authors.lastname: Leishman
authors.forename: Brian T
authors.initials: BT
authors.lastname: Thornock
mesh_terms: D000162:Acoustics / Q000295:instrumentation; D004867:Equipment Design; D005160:Facility Design and Construction / Q000295:instrumentation; D008962:Models, Theoretical; D009038:Motion; D011312:Pressure; D012815:Signal Processing, Computer-Assisted; D013016:Sound; D013997:Time Factors; D014160:Transducers, Pressure