Encoding 3D spatial audio signals by spherical microphone array eigenbeamforming which, is closely related to Higher-order Ambisonics (HOA), is a growing field of interest. These multichannel spatial sound field encoding schemes allow for spatially realistic audio recording and playback. In a typical Ambisonics encoder, only simple scalar weights are used to generate the HOA signals for virtual sources. On the playback side, the Ambisonic signals are decoded with a frequency independent decoding matrix. However, contrary to the simple frequency independent scalar weighting schemes for virtual sources, HOA signals recorded with eigenbeamforming microphone arrays are inherently frequency dependent. This paper describes the frequency dependency of the recorded Ambisonic signals and presents a qualitative analysis of its effects on the decoder.
https://www.aes.org/e-lib/browse.cfm?elib=18316
Click to purchase paper as a non-member or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!
This paper costs $33 for non-members and is free for AES members and E-Library subscribers.
Learn more about the AES E-Library
Start a discussion about this paper!