The DVI Adaptive Differential Pulse Code Modulation (ADPCM) algorithm was first described in an IMA recommendation on audio formats and conversion practices [1]. ADPCM is a transformation that encodes 16-bit audio as 4 bits (a 4:1 compression ratio).

/* ** Intel/DVI ADPCM coder/decoder. ** ** The algorithm for this coder was taken from the IMA Compatability Project ** proceedings, Vol 2, Number 2 May 1992. ** ** Version 1.2, 18-Dec-92.-/* ** Intel/DVI ADPCM coder/decoder. ** **