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一、概述 通路衰耗频率特性是全电路的重要指标之一。通路衰耗频率特性的含义是:电路有效传输频带内每个频率的净衰耗组成的特性曲线,也即是一方送入音频二线端为OdB的各种频率的信号,到达对方音频二线端测得的电平数值变化曲线。实际调测中是以800Hz的净衰耗为标准,其它各频率净衰耗与其相比,看是否合符要求值。如它达不到要求,则会使全程通信质量指标下降,特别是影响声音的清晰度和音色,降低电路的稳定度,引起电路振鸣。
First, an overview Path attenuation Frequency characteristics of the entire circuit is one of the important indicators. Path attenuation frequency characteristics of the meaning of the meaning: the effective attenuation of the transmission frequency band of each frequency of the net attenuation of the composition of the characteristic curve, that is, one side of the audio into the second line of the OdB various frequencies of the signal to reach the other end of the audio two-wire test The value of the level curve. The actual commissioning is based on the net attenuation of 800Hz as the standard, compared with the other net attenuation of each frequency, to see whether it meets the required value. If it does not meet the requirements, it will make the whole communication quality indicators decline, in particular, affect the clarity and tone of the sound, reducing the stability of the circuit, causing circuit vibration.