本标准涵盖可使用ITUT建议P.57:1993和ANSI S3中定义的标准化人工耳测量接收性能的手机和耳机。36-1985. 该标准还包括手机和耳机，它们的传输性能可以通过人工口唇平面前面的发射器声音端口中心来测量。 本标准不包括其他类型的手机或耳机，这些手机或耳机的发射器在正常使用时，其声音端口落在唇形平面后面。 然而，本标准中描述的一般方法可作为测试此类手机或耳机的指南。 本标准涵盖了四线制手机和耳机的测量，这些手机和耳机具有独立的传输和接收语音路径。本标准也适用于传输和接收电路共用一根导线的三线制手机和耳机。当手机和耳机连接到执行四线到二线转换的混合语音网络时，可以使用IEEE Std 269的方法测量其传输性能- 1992年，适当考虑了本标准中讨论的相关发射机定位和接收机耦合问题。

This standard covers handsets and headsets whose receive performance can be measured using standardized artificial ears, as defined in ITUT Recommendation P.57: 1993 and ANSI S3.36-1985. The standard also covers handsets and headsets whose transmit performance can be measured with the center of the transmitter sound port in front of the artificial mouth lip plane. Othere types of handsets or headsets, having transmitters whose sound ports fall behind the lip plane in normal use, are not covered by this standard. However, the general methods described in this standard may be used as guidelines for testing such handsets or headsets. This standard covers measurements on four-wire handsets and headsets having separate transmit and receive speech paths. This standard also applies to three-wire handsets and headsets in which a common lead is shared between the transmit and receive circuitry. When handsets and headsets are connected to hybrid speech networks performing four-wire to two-wire conversion, their transmission performance may be measured using the methods of IEEE Std 269-1992, with due consideration given to the relevant transmitter positioning and receiver coupling issues discussed in this standard.