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>commercial spatial audio

isnt it how Q-Sound worked back in the 80s?

Sound imaging method and apparatus https://patents.google.com/patent/US5105462A https://patents.google.com/patent/US5208860A

Stereo enhancement system including sound localization filters https://patents.google.com/patent/US5774556A

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Thanks for the links. These look like related techniques (like the one the reference software I used has patented), though knowing the general approach wasn't enough for me to get something that sounded good. I'd already tried constructing filters with delays and frequency dependent gains.

The particular coefficients made a considerable difference, which is why I ended up measuring an effect I already liked. I see some example values included in the patents here though, so those might be worth trying.

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