![Hide details for [<u>Section 801-21: General terms</u>]](/iev/iev.nsf/blank.gif?OpenImageResource) Section 801-21: General terms |  |
| 801-21-01 | | acoustic oscillation | |
| 801-21-02 | | audible sound | |
| 801-21-03 | | infrasound | |
| 801-21-04 | | ultrasound | |
| 801-21-05 | | pure sound | |
| 801-21-06 | | complex sound | |
| 801-21-07 | | warble tone | |
| 801-21-08 | | noise | |
| 801-21-09 | | random noise | |
| 801-21-10 | | white noise | |
| 801-21-11 | | pink noise | |
| 801-21-12 | | ambient noise | |
| 801-21-13 | | background noise | |
| 801-21-14 | | reverberation | |
| 801-21-15 | | sound spectrum | |
| 801-21-16 | | line spectrum, <in acoustics> | |
| 801-21-17 | | continuous spectrum | |
| 801-21-18 | | static pressure | |
| 801-21-19 | | instantaneous sound pressure | |
| 801-21-20 | | sound pressure | |
| 801-21-21 | | peak sound pressure | |
| 801-21-22 | | reference sound pressure | |
| 801-21-23 | | sound exposure | |
| 801-21-24 | | particle | |
| 801-21-25 | | instantaneous particle displacement | |
| 801-21-26 | | particle displacement | |
| 801-21-27 | | peak particle displacement | |
| 801-21-28 | | instantaneous particle velocity | |
| 801-21-29 | | particle velocity | |
| 801-21-30 | | peak particle velocity | |
| 801-21-31 | | volume velocity | |
| 801-21-32 | | instantaneous particle acceleration | |
| 801-21-33 | | simple sound source | |
| 801-21-34 | | point sound source | |
| 801-21-35 | | strength of a simple sound source | |
| 801-21-36 | | sound power of a source | |
| 801-21-37 | | sound energy flux | |
| 801-21-38 | | sound power density | |
| 801-21-39 | | instantaneous potential sound energy density | |
| 801-21-40 | | instantaneous kinetic sound energy density | |
| 801-21-41 | | sound energy density | |
| 801-21-42 | | acoustic radiation pressure | |
| 801-21-43 | | spectral density | |
| 801-21-44 | | power spectral density | |
| 801-21-45 | | time constant | |
| 801-21-46 | | stimulus | |
| 801-21-47 | | response | |
| 801-21-48 | | distortion | |
| Section 801-22: Levels | |
| 801-22-01 | | level | |
| 801-22-02 | | bel | |
| 801-22-03 | | decibel | |
| 801-22-04 | | neper | |
| 801-22-05 | | sound power level | |
| 801-22-06 | | sound intensity level | |
| 801-22-07 | | sound pressure level | |
| 801-22-08 | | particle velocity level | |
| 801-22-09 | | (vibratory) acceleration level | |
| 801-22-10 | | peak level | |
| 801-22-11 | | time-average sound pressure level | |
| 801-22-12 | | band sound pressure level | |
| 801-22-13 | | spectrum density level | |
| 801-22-14 | | weighted sound pressure level | |
| 801-22-15 | | peak frequency-weighted sound pressure level | |
| 801-22-16 | | time-average sound level | |
| 801-22-17 | | sound exposure level | |
| Section 801-23: Transmission and propagation | |
| 801-23-01 | | wave | |
| 801-23-02 | | surface wavefront | |
| 801-23-03 | | free progressive wave | |
| 801-23-04 | | compressional wave | |
| 801-23-05 | | longitudinal wave | |
| 801-23-06 | | plane wave | |
| 801-23-07 | | spherical wave | |
| 801-23-08 | | cylindrical wave | |
| 801-23-09 | | transverse wave | |
| 801-23-10 | | rotational wave | |
| 801-23-11 | | bending wave | |
| 801-23-12 | | Rayleigh wave | |
| 801-23-13 | | interference | |
| 801-23-14 | | beat | |
| 801-23-15 | | standing wave | |
| 801-23-16 | | node, <of a standing wave> | |
| 801-23-17 | | antinode | |
| 801-23-18 | | speed of sound | |
| 801-23-19 | | sound wave velocity | |
| 801-23-20 | | phase velocity | |
| 801-23-21 | | group velocity | |
| 801-23-22 | | dispersion | |
| 801-23-23 | | refraction, <of sound waves> | |
| 801-23-24 | | specular reflection | |
| 801-23-25 | | diffraction | |
| 801-23-26 | | scattering | |
| 801-23-27 | | sound field | |
| 801-23-28 | | free sound field | |
| 801-23-29 | | near sound field | |
| 801-23-30 | | far sound field | |
| 801-23-31 | | diffuse sound field | |
| 801-23-32 | | reverberant sound field | |
| 801-23-33 | | linear exponent of sound propagation | |
| 801-23-34 | | elementary exponent of sound propagation | |
| 801-23-35 | | attenuation coefficient | |
| 801-23-36 | | elementary attenuation of propagation | |
| 801-23-37 | | acoustic phase coefficient | |
| 801-23-38 | | elementary dephasing of sound propagation | |
| 801-23-39 | | transmission loss | |
| 801-23-40 | | absorption loss | |
| 801-23-41 | | divergence loss | |
| 801-23-42 | | refraction loss | |
| 801-23-43 | | acoustic streaming | |
| Section 801-24: Oscillation | |
| 801-24-01 | | forced oscillation | |
| 801-24-02 | | free oscillation | |
| 801-24-03 | | transient oscillation | |
| 801-24-04 | | self-induced oscillation | |
| 801-24-05 | | resonance | |
| 801-24-06 | | resonance frequency | |
| 801-24-07 | | anti-resonance | |
| 801-24-08 | | natural frequency | |
| 801-24-09 | | undamped natural frequency | |
| 801-24-10 | | damped natural frequency | |
| 801-24-11 | | fundamental frequency | |
| 801-24-12 | | quality factor | |
| 801-24-13 | | mode of oscillation | |
| 801-24-14 | | normal mode of oscillation | |
| 801-24-15 | | modal numbers | |
| 801-24-16 | | fundamental mode of oscillation | |
| 801-24-17 | | coupled modes | |
| 801-24-18 | | uncoupled mode | |
| 801-24-19 | | damping | |
| 801-24-20 | | critical damping | |
| 801-24-21 | | damping ratio | |
| 801-24-22 | | viscous damping | |
| 801-24-23 | | logarithmic decrement | |
| 801-24-24 | | steady-state oscillation | |
| 801-24-25 | | subharmonic response | |
| 801-24-26 | | impulse | |
| 801-24-27 | | shock pulse | |
| 801-24-28 | | duration of shock pulse | |
| 801-24-29 | | pulse rise time | |
| Section 801-25: Transducer parameters | |
| 801-25-01 | | acoustical system | |
| 801-25-02 | | mechanical system | |
| 801-25-03 | | complex parameter | |
| 801-25-04 | | transducer | |
| 801-25-05 | | passive transducer | |
| 801-25-06 | | active transducer | |
| 801-25-07 | | reversible transducer | |
| 801-25-08 | | reciprocal transducer | |
| 801-25-09 | | transfer function | |
| 801-25-10 | | sensitivity (of a transducer) | |
| 801-25-11 | | relative sensitivity (of a transducer) | |
| 801-25-12 | | sensitivity level (of a transducer) | |
| 801-25-13 | | impedance | |
| 801-25-14 | | conjugate impedances | |
| 801-25-15 | | admittance | |
| 801-25-16 | | immittance | |
| 801-25-17 | | driving-point impedance | |
| 801-25-18 | | transfer impedance | |
| 801-25-19 | | short-circuit impedance | |
| 801-25-20 | | free impedance | |
| 801-25-21 | | loaded impedance | |
| 801-25-22 | | open-circuit impedance | |
| 801-25-23 | | blocked impedance | |
| 801-25-24 | | motional impedance | |
| 801-25-25 | | motional admittance | |
| 801-25-26 | | mechanical impedance (at a point) | |
| 801-25-27 | | mechanical resistance | |
| 801-25-28 | | mechanical reactance | |
| 801-25-29 | | apparent mass | |
| 801-25-30 | | stiffness | |
| 801-25-31 | | compliance | |
| 801-25-32 | | electromechanical transducer | |
| 801-25-33 | | electromechanical coupling coefficient (1) | |
| 801-25-34 | | electromechanical coupling coefficient (2) | |
| 801-25-35 | | specific acoustic impedance | |
| 801-25-36 | | specific acoustic resistance | |
| 801-25-37 | | specific acoustic reactance | |
| 801-25-38 | | specific acoustic admittance | |
| 801-25-39 | | characteristic impedance of a medium | |
| 801-25-40 | | acoustic impedance | |
| 801-25-41 | | acoustic resistance | |
| 801-25-42 | | acoustic reactance | |
| 801-25-43 | | acoustic mass | |
| 801-25-44 | | acoustic stiffness | |
| 801-25-45 | | acoustic compliance | |
| 801-25-46 | | acoustic admittance | |
| 801-25-47 | | electroacoustic transducer | |
| 801-25-48 | | electroacoustic coupling coefficient (1) | |
| 801-25-49 | | electroacoustic coupling coefficient (2) | |
| 801-25-50 | | reference point | |
| 801-25-51 | | principal axis | |
| 801-25-52 | | effective acoustic centre | |
| 801-25-53 | | pressure sensitivity | |
| 801-25-54 | | free-field sensitivity | |
| 801-25-55 | | diffraction factor | |
| 801-25-56 | | free-field current sensitivity | |
| 801-25-57 | | sensitivity to voltage | |
| 801-25-58 | | sensitivity to current | |
| 801-25-59 | | sensitivity to electric power | |
| 801-25-60 | | reciprocity principle | |
| 801-25-61 | | reciprocity coefficient | |
| 801-25-62 | | close-talking sensitivity | |
| 801-25-63 | | axial sensitivity | |
| 801-25-64 | | random-incidence sensitivity | |
| 801-25-65 | | diffuse-field sensitivity | |
| 801-25-66 | | directional pattern | |
| 801-25-67 | | directivity factor | |
| 801-25-68 | | directional gain | |
| 801-25-69 | | angular deviation loss | |
| Section 801-26: Microphones | |
| 801-26-01 | | microphone | |
| 801-26-02 | | standard microphone | |
| 801-26-03 | | pressure microphone | |
| 801-26-04 | | pressure-gradient microphone | |
| 801-26-05 | | omnidirectional microphone | |
| 801-26-06 | | directional microphone | |
| 801-26-07 | | unidirectional microphone | |
| 801-26-08 | | line microphone | |
| 801-26-09 | | multiple microphone | |
| 801-26-10 | | probe microphone | |
| 801-26-11 | | anti-noise microphone | |
| 801-26-12 | | carbon microphone | |
| 801-26-13 | | electrostatic microphone | |
| 801-26-14 | | electret microphone | |
| 801-26-15 | | piezoelectric microphone | |
| 801-26-16 | | electromagnetic microphone | |
| 801-26-17 | | moving-conductor microphone | |
| 801-26-18 | | ribbon microphone | |
| 801-26-19 | | moving-coil microphone | |
| 801-26-20 | | magnetostriction microphone | |
| 801-26-21 | | electronic microphone | |
| 801-26-22 | | ionic microphone | |
| 801-26-23 | | thermal microphone | |
| 801-26-24 | | close-talking microphone | |
| 801-26-25 | | lip microphone | |
| 801-26-26 | | lapel microphone | |
| 801-26-27 | | mask microphone | |
| 801-26-28 | | throat microphone | |
| 801-26-29 | | bone-conduction microphone | |
| 801-26-30 | | telephone microphone | |
| Section 801-27: Loudspeakers and earphones | |
| 801-27-01 | | loudspeaker | |
| 801-27-02 | | loudspeaker unit | |
| 801-27-03 | | electrostatic loudspeaker | |
| 801-27-04 | | piezoelectric loudspeaker | |
| 801-27-05 | | electromagnetic loudspeaker | |
| 801-27-06 | | moving-conductor loudspeaker | |
| 801-27-07 | | magnetostriction loudspeaker | |
| 801-27-08 | | ionic loudspeaker | |
| 801-27-09 | | pneumatic loudspeaker | |
| 801-27-10 | | cone loudspeaker | |
| 801-27-11 | | dome loudspeaker | |
| 801-27-12 | | (acoustic) horn | |
| 801-27-13 | | horn loudspeaker | |
| 801-27-14 | | multicellular loudspeaker | |
| 801-27-15 | | multichannel loudspeaker | |
| 801-27-16 | | acoustic baffle | |
| 801-27-17 | | acoustic enclosure | |
| 801-27-18 | | earphone | |
| 801-27-19 | | telephone earphone | |
| 801-27-20 | | headphone | |
| 801-27-21 | | headset | |
| 801-27-22 | | insert earphone | |
| 801-27-23 | | supra-aural earphone | |
| 801-27-24 | | circumaural earphone | |
| 801-27-25 | | transducer cartridge | |
| 801-27-26 | | bone-conduction vibrator | |
| Section 801-28: Various apparatus | |
| 801-28-01 | | sound level meter | |
| 801-28-02 | | audiometer | |
| 801-28-03 | | acoustic coupler | |
| 801-28-04 | | mechanical coupler | |
| 801-28-05 | | artificial ear | |
| 801-28-06 | | artificial mouth | |
| 801-28-07 | | artificial voice | |
| 801-28-08 | | artificial mastoid | |
| 801-28-09 | | thermophone | |
| 801-28-10 | | electrostatic actuator | |
| 801-28-11 | | pistonphone | |
| 801-28-12 | | Rayleigh disk | |
| 801-28-13 | | acoustic radiometer | |
| 801-28-14 | | sound analyser | |
| 801-28-15 | | vibration meter | |
| 801-28-16 | | sound locator | |
| 801-28-17 | | stereophonic sound system | |
| 801-28-18 | | vocoder | |
| 801-28-19 | | visible speech apparatus | |
| 801-28-20 | | hearing aid | |
| 801-28-21 | | hearing protector | |
| Section 801-29: Physiological acoustics | |
| 801-29-01 | | pitch | |
| 801-29-02 | | mel | |
| 801-29-03 | | loudness | |
| 801-29-04 | | sone | |
| 801-29-05 | | loudness level | |
| 801-29-06 | | calculated loudness level | |
| 801-29-07 | | phon | |
| 801-29-08 | | equal-loudness contour | |
| 801-29-09 | | timbre | |
| 801-29-10 | | judged perceived noise level | |
| 801-29-11 | | perceived noise level | |
| 801-29-12 | | noisiness | |
| 801-29-13 | | noy | |
| 801-29-14 | | tone-corrected perceived noise level | |
| 801-29-15 | | effective perceived noise level | |
| 801-29-16 | | air conduction | |
| 801-29-17 | | bone conduction | |
| 801-29-18 | | threshold of hearing | |
| 801-29-19 | | masked threshold | |
| 801-29-20 | | normal threshold of hearing | |
| 801-29-21 | | standard threshold of hearing | |
| 801-29-22 | | threshold of pain (in electroacoustics) | |
| 801-29-23 | | normal threshold of pain | |
| 801-29-24 | | hearing threshold level | |
| 801-29-25 | | hearing level | |
| 801-29-26 | | pure tone audiogram | |
| 801-29-27 | | auditory sensation area | |
| 801-29-28 | | normal auditory sensation area | |
| 801-29-29 | | sensation level | |
| 801-29-30 | | recruitment | |
| 801-29-31 | | masking | |
| 801-29-32 | | masking audiogram | |
| 801-29-33 | | auditory critical band | |
| 801-29-34 | | detection (in acoustics) | |
| 801-29-35 | | detection differential | |
| 801-29-36 | | difference limen for loudness | |
| 801-29-37 | | difference limen for pitch | |
| 801-29-38 | | relative difference limen for frequency | |
| 801-29-39 | | aural harmonic | |
| 801-29-40 | | electrophonic effect | |
| 801-29-41 | | instantaneous speech power | |
| 801-29-42 | | peak speech power | |
| 801-29-43 | | average speech power | |
| 801-29-44 | | formant | |
| 801-29-45 | | articulation | |
| 801-29-46 | | threshold of speech intelligibility | |
| Section 801-30: Musical acoustics | |
| 801-30-01 | | fundamental tone | |
| 801-30-02 | | partial | |
| 801-30-03 | | harmonic | |
| 801-30-04 | | harmonic series of sounds | |
| 801-30-05 | | vibrato | |
| 801-30-06 | | note | |
| 801-30-07 | | frequency interval | |
| 801-30-08 | | logarithmic frequency interval | |
| 801-30-09 | | octave | |
| 801-30-10 | | tempered whole tone | |
| 801-30-11 | | tempered semitone | |
| 801-30-12 | | savart | |
| 801-30-13 | | cent | |
| 801-30-14 | | musical scale | |
| 801-30-15 | | Pythagorean scale | |
| 801-30-16 | | just scale | |
| 801-30-17 | | equally tempered scale | |
| 801-30-18 | | standard tuning frequency | |
| Section 801-31: Architectural acoustics | |
| 801-31-01 | | sound absorption | |
| 801-31-02 | | sound (power) absorption coefficient | |
| 801-31-03 | | statistical sound (power) absorption coefficient | |
| 801-31-04 | | sound (power) reflection coefficient | |
| 801-31-05 | | sound pressure reflection coefficient | |
| 801-31-06 | | equivalent absorption area of an object or of a surface | |
| 801-31-07 | | reverberation time | |
| 801-31-08 | | decay rate | |
| 801-31-09 | | Eyring absorption coefficient | |
| 801-31-10 | | Sabine absorption | |
| 801-31-11 | | room absorption | |
| 801-31-12 | | Sabine absorption coefficient | |
| 801-31-13 | | reverberation room | |
| 801-31-14 | | live room | |
| 801-31-15 | | mean free path | |
| 801-31-16 | | random incidence | |
| 801-31-17 | | diffuse-field distance | |
| 801-31-18 | | free-field room | |
| 801-31-19 | | dead room | |
| 801-31-20 | | audiometric room | |
| 801-31-21 | | echo | |
| 801-31-22 | | multiple echo | |
| 801-31-23 | | flutter echo | |
| 801-31-24 | | specific wall impedance | |
| 801-31-25 | | specific wall admittance | |
| 801-31-26 | | radiation factor | |
| 801-31-27 | | radiation index | |
| 801-31-28 | | Helmholtz resonator | |
| 801-31-29 | | dissipation | |
| 801-31-30 | | dissipation factor | |
| 801-31-31 | | porous absorber | |
| 801-31-32 | | porosity | |
| 801-31-33 | | flow resistance | |
| 801-31-34 | | specific flow resistance | |
| 801-31-35 | | flow resistivity | |
| 801-31-36 | | average sound pressure level in a room | |
| 801-31-37 | | level difference | |
| 801-31-38 | | normalized level difference | |
| 801-31-39 | | sound reduction index | |
| 801-31-40 | | flanking transmission | |
| 801-31-41 | | impact sound pressure level | |
| 801-31-42 | | normalized impact sound pressure level | |
| 801-31-43 | | field normalized impact sound pressure level | |
| 801-31-44 | | sound absorbing material | |
| 801-31-45 | | acoustical insulation material | |
| 801-31-46 | | impact-sound reducing material | |
| Section 801-32: Underwater acoustics | |
| 801-32-01 | | sonar | |
| 801-32-02 | | active sonar | |
| 801-32-03 | | passive sonar | |
| 801-32-05 | | sonar self-noise | |
| 801-32-09 | | reverberation-limited condition | |
| 801-32-10 | | noise-limited condition | |
| 801-32-15 | | thermocline | |
| 801-32-16 | | isothermal layer | |
| 801-32-17 | | limiting ray | |
| 801-32-18 | | convergence zone | |
| 801-32-19 | | shadow zone | |
| 801-32-20 | | sound channel, <in underwater acoustics> | |
| 801-32-21 | | deep scattering layer | |
| 801-32-26 | | hydrophone | |
| 801-32-28 | | underwater sound projector | |
| 801-32-29 | | transducer, <in underwater acoustics> | |
| 801-32-30 | | ping | |
| 801-32-31 | | continuous wave | |
| 801-32-32 | | real aperture sonar | |
| 801-32-33 | | synthetic aperture sonar | |
| 801-32-34 | | sonar transmitter | |
| 801-32-35 | | pinger | |
| 801-32-36 | | transponder, <in underwater acoustics> | |
| 801-32-37 | | sonar receiver | |
| 801-32-38 | | echo sounder | |
| 801-32-39 | | fisheries echo sounder | |
| 801-32-40 | | navigation echo sounder | |
| 801-32-41 | | scientific echo sounder | |
| 801-32-42 | | single-beam echo sounder | |
| 801-32-43 | | dual-beam echo sounder | |
| 801-32-44 | | split-beam echo sounder | |
| 801-32-45 | | multibeam sonar | |
| 801-32-46 | | scientific multibeam sonar | |
| 801-32-47 | | sidescan sonar | |
| 801-32-48 | | parametric sonar | |
| 801-32-49 | | acoustic lens-based sonar | |
| 801-32-50 | | acoustic Doppler current profiler | |
| 801-32-51 | | Doppler velocity logger | |
| 801-32-52 | | calibrated acoustic source | |
| 801-32-53 | | calibrated hydrophone | |
| 801-32-54 | | standard target | |
| 801-32-55 | | sonar dome | |
| 801-32-56 | | underwater acoustic positioning system | |
| 801-32-57 | | particle velocity sensor | |
| 801-32-58 | | transmit beam | |
| 801-32-59 | | far field | |
| 801-32-60 | | receive beam | |
| 801-32-61 | | beamwidth, <in underwater acoustics> | |
| 801-32-62 | | source level | |
| 801-32-63 | | propagation loss, <in underwater acoustics> | |
| 801-32-64 | | transfer function, <in underwater sound propagation> | |
| 801-32-65 | | sonar calibration | |
| 801-32-66 | | sonar equation | |
| 801-32-67 | | background noise, <in underwater acoustics> | |
| 801-32-68 | | sonar dome insertion loss | |
| 801-32-69 | | ambient noise, <in underwater acoustics> | |
| 801-32-70 | | acoustic ray | |
| 801-32-71 | | reverberation, <in underwater acoustics> | |
| 801-32-72 | | extinction, <in underwater acoustics> | |
| 801-32-73 | | beamforming | |
| 801-32-74 | | range compensation | |
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