標準號：IEEE 661-1979
中文標準名稱：電話連接客觀響度值的測定方法
英文標準名稱：Method for determining objective loudness ratings of telephone connections
標準類型：M21
發布日期：1979/1/1 12:00:00
實施日期：1999/12/31 12:00:00
中國標準分類號：M21
國際標準分類號：17.140.01;33.040.01
適用范圍：Determines the loudness rating of partial and complete telephone connections. For complete telephone connections, comprising overall and sidetone transmission paths, the procedures involve measurement of acoustic input and output pressures. For partial telephone connections comprising transmitting, receiving, or connection paths, the procedures involve measurement of acoustics pressures and electric voltages.