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A simple Sound Pressure Level Meter (SPL) dB audio meter using AVR ATmega [Project]
posted March 13 2014 4:19.32 by spic0m




This is a simple Sound Pressure Level Meter (SPL) dB audio meter using AVR Atmega.

A sound level meter or sound meter is an instrument which measures sound pressure level. Sound pressure level (SPL) or sound level is a logarithmic measure of the effective sound pressure of a sound relative to a reference value. It is measured in decibels (dB) above a standard reference level. The commonly used reference sound pressure in air is = 20 ┬ÁPa (rms) which is usually considered the threshold of human hearing. Keep in mind that 1 pascal will equal an SPL of 94 dB. Because the frequency response of human hearing changes with amplitude, a weighting have been established for measuring sound pressure. Usually the A-weighting curve is used. A weighting curve is a graph of gain across the frequency range (10Hz to 20kHz).


[Link: Davide Gironi]
 
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