| Microsoft DirectX 8.1 (C++) |
Specifies the guard interval on a Digital Video Broadcasting-Terrestrial (DVB-T) system.
| Constant | Value | Description |
| BDA_GUARD_NOT_SET | -1 | The guard interval is not set. |
| BDA_GUARD_NOT_DEFINED | 0 | The guard interval is not defined. |
| BDA_GUARD_1_32 | 1 | The guard interval is 1/32. |
| BDA_GUARD_1_16 | 2 | The guard interval is 1/16. |
| BDA_GUARD_1_8 | 3 | The guard interval is 1/8. |
| BDA_GUARD_1_4 | 4 | The guard interval is 1/4. |
| BDA_GUARD_MAX | 5 | The guard interval is the maximum. |