Specific loudness is a compressive nonlinearity and varies at certain levels and at certain frequencies. However, the reading from a sound level meter does not correlate well to human-perceived loudness, which is better measured by a loudness meter. The current international standard that specifies sound level meter functionality and performances is the IEC 61672-1:2013. Sound level meters are commonly used in noise pollution studies for the quantification of different kinds of noise, especially for industrial, environmental, mining and aircraft noise. Using this information, the instrument is able to accurately convert the electrical signal back to sound pressure, and display the resulting sound pressure level ( decibels dB SPL). The instrument needs to know the sensitivity of the particular microphone being used. While describing sound in terms of sound pressure, a logarithmic conversion is usually applied and the sound pressure level is stated instead, in decibels (dB), with 0 dB SPL equal to 20 micropascals.Ī microphone is distinguishable by the voltage value produced when a known, constant root mean square sound pressure is applied. the sound pressure (unit pascal, Pa), is converted into an electrical signal (unit volt, V). That is why the instrument is sometimes referred to as a sound pressure level meter (SPL). The diaphragm of the microphone responds to changes in air pressure caused by sound waves. The best type of microphone for sound level meters is the condenser microphone, which combines precision with stability and reliability. It is commonly a hand-held instrument with a microphone. An integrating-averaging Cirrus Research's Optimus sound level meter which complies with IEC 61672-1:2002Ī sound level meter (also called sound pressure level meter ( SPL)) is used for acoustic measurements.
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