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VoIP: Relax gain reduction shape #739

@Rikketh

Description

@Rikketh

Is your feature request related to a problem?

Currently gain shape seems to be a cardioid, almost entirely cancelling audio coming from directly behind the listener. This isn't true to how we hear things, though.

Describe your preferred solution

Modify the gain shape to closer be represented with a hypercardioid, or add an overlapping half-dipole to the back. If using hypercardioid, side blindspots would have to be manually covered with an additonal close-fit dipole.

Alternatively, linear 25-100% gain reduction around-to-side should be close enough, as long as spectral HRTF response is used--audio sources located directly behind a listener would have ~400 Hz drop exponentially to ~1500-2000 Hz.

Describe any considered alternatives

Reducing the cardioid's tail to only affect gain partially is an option, but it is still entirely incorrect. As mentioned above, clipping its reduction to 25% is one of the options, but it isn't a good one.

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