Integrated Services Digital Network (ISDN); Videotelephony Teleservice; Part 2: Electroacoustic Characteristics for 3,1 kHz Bandwidth Loudspeaking and Handsfree Terminals
英文名称:Integrated Services Digital Network (ISDN); Videotelephony Teleservice; Part 2: Electroacoustic Characteristics for 3,1 kHz Bandwidth Loudspeaking and Handsfree Terminals