【Overview of JEITA RC-8142】
This is the standard for Headphones with active noise cancelling functions.
Following items are specified in this standard.
-definitions of terms-Measurement method of noise cancelling characteristics-Measurement method of battery life.
-Test procedure for measurement of each characteristic.
This standard will be applied to consumer noise cancelling headphone for listeningmusic.

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Contents
Clause１．Scope ················································································································· 1２．Normative references ·························································································· 1３．Definitions ·········································································································· 2４．Measuring method of noise cancel characteristics ······················································ 34.1 Characteristics to be specified ·············································································· 34.2 Test signals ············································································································34.2.1 Pink noise ································································································ 34.2.2 Simulated environmental noise ··································································· 34.3 Standard conditions for measurement ································································· 74.3.1 General conditions for measurement ···························································· 74.3.2 Test site ··································································································· 74.3.3 Ambient noise ·························································································· 74.4 Test equipment·································································································· 74.4.1 Play back equipment for test signals ····························································· 74.4.2 Couplers and ear simulators and HATS ························································· 74.4.3 Analysis equipment ··················································································· 74.5 Test procedure for measurement of noise suppression level ······································ 84.5.1 Adjustment of sound pressure level of test signals ··········································· 84.5.2 Measurement of sound pressure level to HATS················································ 84.5.3 Sound pressure level measurements at NC-OFF condition······························ 84.5.4 Sound pressure level measurements at NC-ON condition ······························· 84.6 Test procedure for measurement of suppression in loudness ···································· 84.6.1 Test signal loudness adjustment ································································ 84.6.2 Measurement of loudness to HATS ···························································· 84.6.3 Loudness measurements at NC-OFF condition ··········································· 84.6.4 Loudness measurements at NC-ON condition ············································· 94.7 Reporting of data ····························································································· 94.7.1 Noise suppression level ············································································ 94.7.2 Noise suppression ratio ···········································································10５．Measuring method of battery life············································································105.1 Characteristics to be specified ···········································································105.2 Scope ···········································································································105.3 Climatic conditions ························································································10(1)JEITA RC-8142
5.4 Batteries ······································································································105.5 Measuring method ························································································105.6 Input signal ··································································································105.7 Noise signal ··································································································105.8 Reporting of data ··························································································10Annex 1 Simulated diffuse sound field for measurement of NC headphone ·······················12Explanation ············································································································13(2)