The changeover from analog to digital television was once envisioned as a smooth, peaceful process. The reality has proven to be rocky and contentious. The broadcast standard has been debated continuously since the beginning, continuing as the first generations of digital television transmitters and receivers went on the market. In March of this year, the Advanced Television Systems Committee, under pressure from Sinclair Broadcasting Group and others, began a review of the technical standards that it recommended in 1996, with the possibility of changing the modulation scheme for DTV. If the ATSC finds that a change is needed, the FCC could require its implementation. Any changes could adversely affect the desirability of products now on the market or in production.