An ad hoc advisory group formed by the United States Federal Communications Commission (FCC) for the purpose of reviewing, testing, and documenting digital television (DTV) standards recommendations developed by the Grand Alliance. Specifically, standards recommendations were developed for standard definition television (SDTV) and high definition television (HDTV).The ATSC completed its work in the summer of 1995 and the standards were approved by the FCC in December 1996. See also digital, DTV, FCC, Grand Alliance, HDTV, and SDTV.