Audio Noise level Detection and Display in DB..

Can u have any idea to design this kind of equipment using Arduino...

Can u be a little bit more specific?
I remember having seen similar requests the other day...

P.S.: This device could be a hardware start, but it needs calibration...
http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl

Can u have any idea to design this kind of equipment using Arduino.

Yes I can have ideas about designing this sort of equipment.
Thanks for asking.