tx_method [ATSC Semantics]
tx_method is an 2-bit unsigned integer that identifies the VSB transmission method used to associate the program element.
valid tx_Method values
| tx_method | Meaning |
| 0 / 0x0 | main -- This program element transmitted using main coding |
| 1 / 0x1 | half_rate -- This program element transmitted using rate-one-half enhanced coding |
| 2 / 0x2 | quarter_rate -- This program element transmitted using rate-one-quarter enhanced coding |
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