| 摘要 |
A repeater receives an input signal containing mobile/handheld (M/H) data received in an M/H frame equivalent in size to 20 VSB data frames. Each VSB frame contains an odd VSB field and an even VSB field, and each of the VSB fields includes one field sync segment and 312 data segments. The M/H frame includes main data and M/H data, and the M/H data has more robust coding than the main data. The received input signal is demodulated to produce an MPEG transport steam. Frame registration is used to find data and field syncs in the MPEG transport steam. The trellis encoder is reset prior to M/H training data in to the mobile data stream. The data is VSB modulated, the field syncs are added to the modulated data to reconstruct the M/H frame, and the M/H frame upconverted to an RF output signal, which is retransmitted. |
