hearing level for speech

4.37  hearing level for speech. For a specified speech signal, for a specified type of transducer, and for a specified manner of presentation, the speech level minus the appropriate speech recognition threshold signal. Unit, decibel (dB)....

hearing

4.36  hearing. Sense by which sound is...

free-field sensitivity (of an earphone)

4.35  free-field sensitivity (of an earphone). At a given frequency, for at least 10 otologically normal subjects, quotient of sound pressure level, or force level, of a frontally incident plane progressive wave by input voltage to an earphone, or bone...

free-field equivalent earphone output level

4.34  free-field equivalent earphone output level. At a given frequency, sound pressure level produced by the earphone in an acoustic coupler or ear simulator plus a correction consisting of the difference between the free-field sensitivity level and the...

free-field equivalent bone vibrator output level

4.33  free-field equivalent bone vibrator output level. At a given frequency, vibration force level produced by the bone vibrator on a mechanical coupler plus a correction consisting of the difference between the free-field sensitivity level and the coupler...