modulation_mode [ATSC Semantics]
The modulation_mode is an eight-bit field in a virtual channel entry tells receivers the modulation used to transmit individual channels.
valid Terrestrial & Cable modulation modes
| modulation_mode | meaning |
| 1 / 0x01 | Analog |
| 2 / 0x02 | SCTE_mode_1 |
| 3 / 0x03 | SCTE_mode_2 |
| 4 / 0x04 | ATSC (8-VSB) |
| 5 / 0x05 | ATSC (16-VSB) |
80-255
0x80-0xFF | User Private |
valid Satellite modulation modes
| modulation_mode | meaning |
| 1 / 0x01 | QPSK ITU-R BQ.1516 System C |
| 2 / 0x02 | BPSK |
| 3 / 0x03 | OQPSK |
| 6 / 0x06 | modulation not specified |
| 7 / 0x07 | QPSK ETS 300-421 |
| 8 / 0x08 | 8PSK ATSC A/80 |
| 9 / 0x09 | 16PSK ATSC A/80 |
| 10 / 0x0A | 16QAM ATSC A/80 |
| 63 / 0x3F | Defined in an ATSC Private Information descriptor |
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