IEC 61053-1 Ed. 1.0 b:1991, Helical-scan video tape cassette system using 12,65 mm (0,5 in) magnetic tape on type Beta format - FM audio recording - Part 1: 625 line-50 field systems

Defines the electrical and mechanical characteristics of FM audio recording which provides for the interchangeability of recorded cassettes. The requirements given relate to 625 lines-50 field systems. Applies to frequency modulation (FM) audio recording on video recorders fully compatible with the beta format for 625 lines-50 field television systems defined in IEC 60767.