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认为降噪
下表显示不同分贝级和相应的实际声压级(SPL)的降低，以及人类为降低噪音水平而感知到的音量降低。
| dB | 实际SPL减少 | 认为肺减容 |
| 3 dB | 50.00% | 18.77% |
| 6 dB | 75.00% | 34.02% |
| 9 dB | 87.50% | 46.41% |
| 12 dB | 93.75% | 56.47% |
| 15分贝 | 96.88% | 64.64% |
| 18分贝 | 98.44% | 71.28% |
| 21个分贝 | 99.22% | 76.67% |
| 24分贝 | 99.61% | 81.05% |
| 27分贝 | 99.80% | 84.61% |
| 30 dB | 99.90% | 87.50% |
| 33分贝 | 99.95% | 89.85% |
| 36分贝 | 99.98% | 91.75% |
| 39 dB | 99.99% | 93.30% |
| 42 dB | 99.99% | 94.56% |
| 45分贝 | 100.00% | 95.58% |
| 48分贝 | 100.00% | 96.41% |
| 51 dB | 100.00% | 97.08% |
| 54 dB | 100.00% | 97.63% |
| 57 dB | 100.00% | 98.08% |
| 60分贝 | 100.00% | 98.44% |
| 63分贝 | 100.00% | 98.73% |
| 66分贝 | 100.00% | 98.97% |
| 69分贝 | 100.00% | 99.16% |
| 72分贝 | 100.00% | 99.32% |
| 75分贝 | 100.00% | 99.45% |
| 78分贝 | 100.00% | 99.55% |
| 81分贝 | 100.00% | 99.64% |
