UNE-EN 61937-7:2005 Digital audio - Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 -- Part 7: Non-linear PCM bitstreams according to the ATRAC, ATRAC2/3 and ATRAC-X formats (Endorsed by AENOR in October of 2009.)
2016UNE-EN 61937-7:2005/A1:2016 Digital audio - Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 - Part 7: Non-linear PCM bitstreams according to the ATRAC, ATRAC2/3 and ATRAC-X formats (TA 4) (Endorsed by AENOR in October of 2016.)
2009UNE-EN 61937-7:2005 Digital audio - Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 -- Part 7: Non-linear PCM bitstreams according to the ATRAC, ATRAC2/3 and ATRAC-X formats (Endorsed by AENOR in October of 2009.)