High Order Ambisonics Encoding Method Using Differential Microphone Array

Gao S, Wu X, Qu T. High Order Ambisonics Encoding Method Using Differential Microphone Array. In: AES Convention 144. Audio Engineering Society; 2018. Paper 10020. Available from: https://aes.org/publications/elibrary-page/?id=19416

@inproceedings{Gao2018_19416,
  author = {Gao, Shan and Wu, Xihong and Qu, Tianshu},
  title = {{High Order Ambisonics Encoding Method Using Differential Microphone Array}},
  booktitle = {AES Convention 144},
  note = {Paper 10020},
  year = {2018},
  month = may,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=19416}
}

TY  - CPAPER
TI  - High Order Ambisonics Encoding Method Using Differential Microphone Array
AU  - Gao, Shan
AU  - Wu, Xihong
AU  - Qu, Tianshu
T2  - AES Convention 144
M1  - Paper 10020
PY  - 2018
DA  - 2018/05/06
UR  - https://aes.org/publications/elibrary-page/?id=19416
PB  - Audio Engineering Society
LA  - en
AB  - High order Ambisonics (HOA) is a flexible way to represent and analyze the sound field. In the process of the spherical Fourier transform, the microphone array need be uniformly scattered on the surface of a sphere, which limits the application of the theory. In this paper we introduce a HOA encoding method using the differential microphone arrays (DMAs). We obtain the particular beam patterns of different orders of spherical functions by the weighted sum of time-delayed outputs from closely-spaced differential microphone array. Then HOA coefficients are estimated by projecting the signals to the beam patterns. The coefficients calculated by the DMA are compared to the results derived from the theoretical spherical harmonics, which proves the effectiveness of our method.
ER  -