A family of three versions of an ATV transmission scheme said to be both receiver-compatible and channel-compatible. Since the original MUSE schemes are neither, there is little similarity between them, other than the use of sub-sampling. The differences between the three versions relate to how the wide aspect ratio is handled and what techniques are used for augmentation in an ATV set. Two versions of MUSE-6 use the letterbox technique for aspect ratio accommodation and both of these use blanking stuffing in the expanded VBI area for vertical resolution enhancement.

The differences between the two versions relate to the duration of the sub-sampling sequence (one frame or two). The third uses the truncation technique for aspect ratio accommodation, sending the side panels stuffed into the existing VBI and HBI. Additional horizontal detail is transmitted via two-frame sub-sampling.