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What is the mechanism of the 2 input buffer

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ermai

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The circuit is as below

https://imgur.com/Sehsc


I didn't find it out by google search and in library and I want to know how it outpputs half of sum of the two input voltage and name of it.Thanks
 

Easiest is to use a summing op amp amplifier with two equal value input resistors to the summing junction and one feedback resistor equal to 1/2 the input resistor value. That way you don't need a divider on the output, which increases the output impedance.
 

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