Application of COM technology in the design of the software for virtual Sound Level Meter;

Study on testing L_(eq) function of the sound level meter with step wave method;

Conventional sound level meters generally use precision ceramic microphones and discrete solid state circuitry or integrated circuit operational amplifiers,and a set of standardized frequency weighting filters,standardized exponential time weighting circuits,logarithmic amplitude detector,and a display in decibels capable of measuring the RMS averaged sound level and other specifications.