What is the shading effect in space perception of sound? In general, a sound source with a higher frequency will cause a

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What is the shading effect in space perception of sound? In
general, a sound source with a higher frequency will cause a
stronger shading effect as compared to a sound source with a lower
frequency (assuming both sources are placed in the same position
relative to the ears). Explain the reason for this phenomenon.
[Provide your answer in about 200 words]
(20%)
(b)
Suggest a method for reproducing virtual directional sound
source using ear phones. What method would you suggest to make the
virtual sound source more immersive, as perceived in a real
acoustic environment, such as in a big concert hall? Explain your
reasoning. [Provide your answer in about 200 words]