High-definition digital video was not possible with uncompressed video due to impractically high memory and bandwidth requirements, with a bit-rate exceeding 1Gbit/s for full HD video. Digital HDTV was enabled by the development of discrete cosine transform (DCT) video compression. The DCT is a lossy compression technique that was first proposed by Nasir Ahmed in 1972, and was later adapted into a motion-compensated DCT algorithm for video coding standards such as the H.26x formats from 1988 onwards and the MPEG formats from 1993 onwards. Motion-compensated DCT compression significantly reduced the amount of memory and bandwidth required for digital video, capable of achieving a data compression ratio of around 100:1 compared to uncompressed video. By the early 1990s, DCT video compression had been widely adopted as the video coding standard for HDTV.