Fidelity of spatial hearing effects generated by loudspeakers degrades outside the sweet spot. This paper proposes a method to analyze a sound scene created by stereo loudspeakers and modify it with the help of assistant headphones. Loudspeaker positions are found by analyzing B-format recordings at the listener position. This information is evaluated to generate signals for assistant headphones. Headphone signals are filtered with head related transfer functions for amplitude panning to change the positions of the loudspeakers. Then, other headphone signals are added which lead the original sounds for further loudspeaker and lag the original sounds for nearer loudspeaker creating direct-echo pairs. The system improves listening conditions outside the sweet spot and is extendable to multiple listeners.
https://www.aes.org/e-lib/browse.cfm?elib=12395
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