ITU-T SERIES P SUPP 16-1988 电话会议房间[1]和会议电话机(GATs)内的麦克风和扩音器的安装指南
Guidelines for Placement of Microphones and Loudspeakers in Telephone Conference Rooms [1] and for Group Audio Terminals (GATs) - Series P: Telephone Transmission Quality Telephone Installations Local Line Networks Supplement 16