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Hearing protection device (small and cost effective )

Hello

I am working on design of adaptive hearing protection device.

Protection device which stops unwanted noise if noise levels are high, but allows sound to enter the ear when noise levels are low. 

I want to use analog electronics instead of DSP. 

There are methods like sound compression, AGC and peak amplification with clipping.

Does anyone have any information or technical documents related to this?

Thanks.