| 摘要 |
PURPOSE: A dynamic transmission parameter reset method in an ATSC-M/H(advanced television systems committee-mobile/handheld) multiplexer is provided to solve broadcasting distortion problems generated by shortage of transmission rates in a mobile service adding process. CONSTITUTION: An ATSC-M/H multiplexer determines whether a transmission rate of a legacy ATSC exceeds maximum transmission rates(S250). When the transmission rate of the legacy ATSC exceeds acceptable maximum transmission rates, an ATSC-M/H multiplexer reduces the whole number of M/H groups in an M/H frame(S300). The ATSC-M/H multiplexer reduces the number of the M/H groups according to the calculated number of slots in a sub frame of the M/H frame. The ATSC-M/H multiplexer resets a transmission parameter of a control channel according to the reduced M/H group number(S350). [Reference numerals] (AA) Start; (BB,CC,FF,HH) No; (DD,EE,GG,II) Yes; (JJ) End; (S100) Legacy ATSC and M/H data load; (S150) Legacy ATSC R_L calculation; (S200) Each Parade R_m calculation; (S250) R_L>R_Lmax?; (S300) Decrease in TNoG(mathematical equation 1); (S350) Reset(TPC and FIC update); (S400) Packet timing and PCR control; (S450) M/H preprocessing; (S500) End?; (S550) TNoG conversion?; (S600) C==Cth?; (S650) Increase in TNoG(mathematical equation 2); (S700) C=0; (S750) C=C+1 |
