| Share | Phrase |
|---|
| 10.63% | acoustic [physical/chemical] signal |
| 9.34% | acoustic [physical/chemical] level |
| 8.78% | acoustic [physical/chemical] oscillation |
| 7.65% | acoustic [physical/chemical] energy |
| 6.87% | acoustic [physical/chemical] wave |
| 6.82% | acoustic [physical/chemical] activity |
| 6.82% | acoustic [physical/chemical] driver |
| 5.40% | acoustic [physical/chemical] impedance |
| 4.68% | acoustic [physical/chemical] pattern |
| 4.26% | acoustic [physical/chemical] resonance |
| 3.10% | acoustic [physical/chemical] sensor |
| 3.08% | acoustic [physical/chemical] surface |
| 3.08% | acoustic [physical/chemical] transducer |
| 2.94% | acoustic [physical/chemical] attenuation |
| 2.94% | acoustic [physical/chemical] flanking |
| 2.56% | acoustic [physical/chemical] seal |
| 2.33% | acoustic [physical/chemical] device |
| 2.24% | acoustic [physical/chemical] emission |
| 2.08% | acoustic [physical/chemical] damper |
| 1.88% | acoustic [physical/chemical] mode |
| 1.28% | acoustic [physical/chemical] material |
| 1.15% | acoustic [physical/chemical] system |