Aviation Occupational Health and Safety Regulations

2.1 The following definitions apply in this Part.

A-weighted sound pressure level

A-weighted sound pressure level means a sound pressure level as determined by a measurement system that includes an A-weighting filter that its manufacturer represents as meeting the requirements set out in the International Electrotechnical Commission International Standard IEC 61672-1:2002(E), 1st edition 2002-2005 Electroacoustics – Sound Level Meters. (niveau de pression acoustique pondérée A)

dBA

dBA means decibel A-weighted and is a unit of A-weighted sound pressure level. (dBA)

noise exposure level (L_ex,8)

noise exposure level (L_ex,8) means 10 times the logarithm to the base 10 of the time integral over any 24-hour period of a squared A-weighted sound pressure divided by 8, the reference sound pressure being 20 μPa. (niveau d’exposition (L_ex,8))

sound level meter

sound level meter means a device for measuring sound pressure level that its manufacturer represents as meeting the performance requirements for a Type 2 instrument as specified in the International Electrotechnical Commission International Standard IEC 61672-1:2002(E), 1st edition 2002-2005 Electroacoustics – Sound Level Meters. (sonomètre)

sound pressure level

sound pressure level means 20 times the logarithm to the base 10 of the ratio of the root mean square pressure of a sound to the reference sound pressure of 20 μPa, expressed in decibels. (niveau de pression acoustique)