I want to know the answer to the following question:
Which standard were ATSC and DVB based on?
All the background I'm provided with is that "Both ATSC and DVB were based on the MPEG-2 standard, although DVB systems may also be used to transmit video using the newer and more efficient H.264/MPEG-4 AVC compression standards.". Is that enough to answer the question?
Answer: yes