| Definition: | an instrument, having a specified performance in respect of directivity, various frequency responses, rectification characteristic, and various dynamic responses, intended for the measurement of sound pressure levels
NOTE – For telephony, the CCITT recommends in the CCITT Recommendation P54 from the Volume V of the Blue Book, 1989, the adoption of the sound level meter specified in the publication 651 (1979) of the IEC entitled: sound level meters.
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