A family of ATV schemes proposed by Bell Labs and IIT. SLSC is a receiver-compatible, non-channel compatible ATV scheme using a high line rate camera and prefiltering with receiver line doubling to increase vertical resolution and additional bandwidth to increase horizontal resolution and help reduce NTSC artifacts. Aspect ratio is increased by blanking stuffing in the HBI.

SLSC schemes have been proposed with at least two types of chroma encoding and three types of widescreen panel transmission.