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IEC Standard 80000-14
Quantities and Units for AUDIO-IN and AUDIO-OUT
Table 4 Â Quantities, Units, and Definitions for the AUDIO Modality
| AUDIO-IN | and AUDIO-OUT | QUANTITIES | | |
| Item No. | Name | Symbol | Definition | Remarks |
| 14-8.1 | sound pressure, stress fr pression (f) acoustique | pi, (Pa) | difference of the instantaneous pressure and the static pressure | The symbol for sound pressure is often used without modification for the root-mean-square (rms) value. For sound pressure level, see item 14-5.19. See ISO 80000-8, item 8-9.2. See Figure 9 and Figure 10. |
| 14-8.2 | acoustic impedance frimpédance(f) acoustique | Za | at a surface, the complex quotient of the average sound pressure over that surface and the sound volume flow rate through that surface | See ISO 80000-8, item 8-20. |
| 14-8.3 | sound power fr puissance (f) acoustique | P,(Pa) | power emitted, transferred or received as sound waves | See ISO 80000-8, item 8-16. |
| 14-8.4 | potential difference fr différence (f) de potentiel | U, (V) | | See IEC 80000-6, item 6-11.2. |
| 14-8.5 | auditory thresholds fr seuils (m) de l'audition | Ŧa | thresholds of sensitivity to auditory signals and other input to the ear or the sense of hearing | |
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