| Title | Low frequency phase calibration for a circular microphone array |
| Publication Type | Conference Paper |
| Year of Publication | 2007 |
| Authors | Teal, P.D., and Poletti M.A. |
| Conference Name | ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings |
| Date Published | 2007 |
| Keywords | Acoustic arrays, Calibration, Frequency response, Holography, Microphones, Mid-range frequencies, Multipath propagation, Phase calibration, Phase mismatch, Sound recording |
| Abstract | Previous work has indicated that a limitation on the low frequency performance of a circular microphone array for holographic sound field recording is phase mismatch between the microphones in the array. At low frequencies these variations become more significant than at mid-range and high frequencies because the high order phase mode responses are lower in amplitude. This paper investigates the possibility of performing a "self" calibration of a microphone array. The basis of the calibration is to estimate the location of one or more sources using mid-range frequencies and to use this source location information to perform, correction to the array at low frequencies. This of course implies that the calibration is performed in a relatively anechoic environment, since multipath effects at widely differing frequencies are uncorrected. Initial results confirm that a significant improvement in the array response is possible using this approach. © 2007 IEEE. |
| URL | http://www.scopus.com/inward/record.url?eid=2-s2.0-34547498518&partnerID=40&md5=bc7b8c93c2ff4700ad4bb9b156d1ab06 |
| DOI | 10.1109/ICASSP.2007.366636 |
