Actually, R.Belmont pointed out that my information is not completely correct:
The EASC was designed to be able to decode CD-XA with any coefficients you wanted.
Sony's CD-XA standard (from 1988?) was the origin of the encoding known as BRR.
"FYI, the default XA coefficients in the EASC are...
The actual encoding here is a Sony-designed ADPCM encoding called Bit-Rate Reduction ( http://en.wikipedia.org/wiki/Bit_Rate_Reduction ) designed originally for CD-XA but used on the Super Nintendo, Sony Playstation, and even the Philips CD-I to encode sample data.
Note that in hardware BRR is...