I would like to initiate a discussion of v4l-dvb API proposal for China DTV. Some of you may heard about China DTV standard as DMB-T/H, it is not totally correctly. China standard GB20600-2006 is indeed a union of DMB-TH(multi-carrier) and ADTB-T(single carrier). For API inclusion, I just read the standard document for GB20600. I am not very good in that electronics area, but I gather the following information of parameters, hope I don't miss anything: Number of Carriers: C=1, C=3780 Constellations: 4QAM, 4QAM-NR, 16QAM, 32QAM, 64QAM FEC(LDPC): rate = 0.4, rate = 0.6, rate = 0.8 Frame body size: always 3780 symbols Frame header size: 420 symbols (1/10 guard interval), 595 symbols (0.136 guard interval), 945 symbols (1/5 guard interval) Time domain symbol interleave: M=240(B=52), M=720(B=52) Despite "C=1" and "interleave", I don't know if DVB has such interleave, I see a chance to extend the current FE_OFDM structure (in dvb_frontend_parameters). Or should we create a new structure, like the separation of FE_ATSC and FE_OFDM? Cheers, David -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
