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Since the inception of digital TV broadcast, the video level, the audio level setup etc. is solely withing the studio operations and has nothing to do with transmitter setup. The transmitter receives an MPEG2 transport stream and the transport is modulated as per the countries adopted standard. Europe is DVB-T and DVB-T2, Japan ISDB, China DMB-T etc.
So today's TV broadcast transmitter is all about setting up the efficiency of delivering a transport stream and has nothing to do with the previous analog concerns about the video or audio quality directly.
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