Octave and Third Octave Bands
This section helps you to understand what the Octave and Third Octave bands are.
Octave bands are frequency bands that have a width of one octave. This means that an octave band is always twice as wide as the previous octave band and half as wide as the successive octave band.
Third Octave bands are frequency bands built from the subdivision of octave bands into three sections.
Ansys Sound: Analysis and Specification uses standard frequencies as indicated in the following tables.
| Flower in SAS | Fc in SAS | Fupper in SAS |
|---|---|---|
| 22.4 | 31.5 | 44.7 |
| 44.7 | 63 | 89.1 |
| 89.1 | 125.0 | 178.0 |
| 178.0 | 250.0 | 355.0 |
| 355.0 | 500.0 | 708.0 |
| 708.0 | 1000.0 | 1410.0 |
| 1410.0 | 2000.0 | 2820.0 |
| 2820.0 | 4000.0 | 5620.0 |
| 5620.0 | 8000.0 | 11230.0 |
| 11230.0 | 16000.0 | 22420.0 |
| Flower in SAS | Fc in SAS | Fupper in SAS |
|---|---|---|
| 22.4 | 25.0 | 28.2 |
| 28.2 | 31.5 | 35.5 |
| 35.5 | 40.0 | 44.7 |
| 44.7 | 50.0 | 56.2 |
| 56.2 | 63.0 | 70.8 |
| 70.8 | 80.0 | 89.1 |
| 89.1 | 100.0 | 112.0 |
| 112.0 | 125.0 | 141.0 |
| 141.0 | 160.0 | 178.0 |
| 178.0 | 200.0 | 224.0 |
| 224.0 | 250.0 | 282.0 |
| 282.0 | 315.0 | 355.0 |
| 355.0 | 400.0 | 447.0 |
| 447.0 | 500.0 | 562.0 |
| 562.0 | 630.0 | 708.0 |
| 708.0 | 800.0 | 891.0 |
| 891.0 | 1000.0 | 1120.0 |
| 1120.0 | 1250.0 | 1410.0 |
| 1410.0 | 1600.0 | 1780.0 |
| 1780.0 | 2000.0 | 2240.0 |
| 2240.0 | 2500.0 | 2820.0 |
| 2820.0 | 3150.0 | 3550.0 |
| 3550.0 | 4000.0 | 4470.0 |
| 4470.0 | 5000.0 | 5620.0 |
| 5620.0 | 6300.0 | 7080.0 |
| 7080.0 | 8000.0 | 8910.0 |
| 8910.0 | 10000.0 | 11230.0 |
| 11230.0 | 12500.0 | 14130.0 |
| 14130.0 | 16000.0 | 17820.0 |
| 17820.0 | 20000.0 | 22420.0 |