IEC standards download IEC 60958-1 :2021 pdf download – Digital audio interface – Part 1: General IEC 60958-1 :2021 pdf download - Digital audio interface – Part 1: General. 4 Interface format 4.1 Structure of format 4.1 .1 Sub-frame format Each sub-frame is divided into 32 time slots, numbered from 0 to 31... 03-02 Download Now