The maximum absolute level of the signal waveform in the continuous time domain, measured per ITU-R BS.1770. Its units are dB TP (meaning decibels relative to nominal 100%, true-peak).
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The Advanced Television Systems Committee, Inc., is an international, non-profit organization developing voluntary standards and recommended practices for digital terrestrial broadcasting. ATSC member organizations represent the broadcast, broadcast equipment, motion picture, consumer electronics, computer, cable, satellite, and semiconductor industries. ATSC also develops digital terrestrial broadcasting implementation strategies and supports educational activities on ATSC standards.