4.32 exchange rate. The level in decibels that the sound level of daily noise exposure must increase (decrease) to preserve a selected measure hearing damage risk when the exposure duration is halved (doubled). See also 4.23, 4.45 and...
4.30 equivalent threshold force level (monaural listening). At a specified frequency, for a specified configuration of a bone vibrator on a specified mechanical coupler, the vibration force level set up by the bone vibrator in a specified coupler when the...
4.29 equivalent threshold level (monaural earphone listening). At a specified frequency, for a specified type of earphone, and for a stated force of application of the earphone to a human ear, the sound pressure level set up by the earphone in a specified...
4.28 equivalent speech recognition threshold sound pressure level. For a specified speech signal, type of transducer, and manner of signal presentation, the sound pressure level produced by a transducer in a specified acoustic coupler when the voltage...
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