Title :
Broadband direction estimation method utilizing combined pressure and energy gradients from optimized microphone array
Author :
Ahonen, Jukka ; Pulkki, Ville
Author_Institution :
Sch. of Sci. & Technol., Dept. of Signal Process. & Acoust., Aalto Univ., Espoo, Finland
Abstract :
This paper proposes a method for analyzing the direction of the arrival of sound by estimating the sound intensity vector from the pressure and energy gradients of closely-spaced omnidirectional microphones depending on frequency. Microphones with relatively large housing, which cause shadowing, are used here to provide inter microphone level differences in order to compute the energy gradients at high frequencies. The proposed method is evaluated in the direction analysis of a spatial-sound processing technique, Directional Audio Coding (DirAC). It is shown that the method provides a reliable direction estimation at the entire audio frequency range, whereas the traditional method employing the pressure gradients produces correct estimation in a limited frequency window only.
Keywords :
audio coding; direction-of-arrival estimation; microphone arrays; audio frequency range; broadband direction estimation method; closely-spaced omnidirectional microphones; direction analysis; directional audio coding; energy gradients; limited frequency window; optimized microphone array; pressure gradients; sound intensity vector; spatial-sound processing technique; Arrays; Audio coding; Estimation; Frequency estimation; Indexes; Microphones; Shadow mapping; Spatial sound; direction analysis; microphone arrays;
Conference_Titel :
Acoustics, Speech and Signal Processing (ICASSP), 2011 IEEE International Conference on
Conference_Location :
Prague
Print_ISBN :
978-1-4577-0538-0
Electronic_ISBN :
1520-6149
DOI :
10.1109/ICASSP.2011.5946337