In this paper the line-interlaced scanning DTV broadcasting system is studied. The baseband of interlaced scanning system is introduced which can be reconstructed without spectral aliasing in DTV receiver, and the temporal resolution factor is invited that adjusts the shape of baseband to best match the spectrum of broadcasting video signal. A novel DTV broadcasting system is proposed which employs progressive scanning in camera and in monitor while adopts line-interlaced scanning for video codec, compatible with existing interlaced scanning DTV broadcasting System. This DTV broadcasting system, which only carry the baseband signals of interlaced scanning, can eliminate the spectral replica generated by interlaced scanning, and can reconstruct progressive scanning video signal without spectral aliasing in receiver, hence radically improving the image quality of DTV broadcasting system.Similarly the 2-D interlaced scanning is studied and the improved 2-D interlaced scanning DTV system is proposed.This system is theoretically proved to be able to give visually better image quality of reconstructed picture than the lineinterlaced scanning DTV system for it owns larger spectral capacity without aliasing and the optimal 3-D spectrum matching transmission of video sequence.

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