| 摘要 | This Recommendation contains a recommendation for the mean active speech level to be used for setting the levels of announcement machines and speech synthesis systems in the telephone network. A level of -19 dBm0 is recommended, which presumes that the SLR of the telephones in the network is 8 dB, the long-term target value (referred to a 0 dBr point). If the present SLR in a national network is different, the recommended level can be adjusted, using a formula supplied, to a level consistent with that of live speech in the network. The recommended level is defined at the 0 dBr point, and to measure the level a speech voltmeter conforming to the requirements of Method B speech level meters in Recommendation P.56 should be used.
本建议包括在电话网中设置公告机器和语音分析系统级别的平均活性语音级别的建议。一个19 dBm0 的级别被推荐，假定网络中电话的SLR 是8 dB，是长期目标值。如果目前国家网络中的SLR 不同，推荐级别可以使用一个应用公式被调整到与网络中的实况语音级别一致。推荐级别被定义在0 dBr点，按照建议P.56 中方法 B 语音级别表中要求测量语音伏特表的级别 |