A family of three versions of an ATV transmission scheme said to be receiver-compatible and using a 3 MHz augmentation channel. The three versions are very similar to the three versions of MUSE-6, except that the version using the truncation method sends the wide-screen panels on the augmentation channel rather than stuffing them into the HBI and the VBI. There are two classes of the three versions of MUSE-9, one with a contiguous augmentation channel and one without. The one without is said to be somewhat inferior in quality to the one with.