Integrated Services Digital Network (ISDN); Videotelephony Teleservice; Part 1: Electroacoustic Characteristics for 3,1 kHz Bandwidth Handset Terminals Second Edition
英文名称:Integrated Services Digital Network (ISDN); Videotelephony Teleservice; Part 1: Electroacoustic Characteristics for 3,1 kHz Bandwidth Handset Terminals Second Edition