17.140.01;33.040.01 标准查询与下载

IEEE 661-1979 电话连接客观响度值的测定方法

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.

Method for determining objective loudness ratings of telephone connections

ANSI/IEEE 661:1979 电话连接线客观声级额定值的测定标准方法

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.

Standard Method for Determining Objective Loudness Ratings of Telephone Connections