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Noise Monitoring circuit Diagram analog part

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sabine

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Anyone please help me to design the Environmental noise monitoring system ,...
first part is to design the analog part..
which consists of the microphone,preamp circuit, A frequency weighting circuit,
C frequency weighting circuit and logarithmic amplifiers,,,
please help me on the circuit diagram..
what are the basic difference between A and C frequency weighting circuit with diagram//
 

A weighting has more poles and zeros respectively filter stages.

The common weighting characacteristics are given in form of (real) poles and zeros, so they can be easily converted into a chain of first order low- and high-pass filters.
A-weighting - Wikipedia, the free encyclopedia
 

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