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本文推导出了线性四端网络和乘积解调器中,测距音(侧音)迟延的表达式,指出了:相频特性非奇对称,幅频特性非偶对称和乘积解调非正交对测音迟延的影响。提出了影响测距误差的两个新因素:幅频特性和乘积解调的非正交相位差。讨论了它们各自引起的时延漂移及其相互的制约关系。本文的结论尚可推广到由其它因素所引起的信号谱线不对称和相移不对称而带来的侧音延迟的计算中。文中给出了设计计算实例。
In this paper, we derive the expression of ranging sound (sidetone) delay in linear four-terminal networks and product demodulators, pointing out that non-symmetrical phase-frequency characteristics, non-symmetrical amplitude-frequency characteristics and non-orthogonal product demodulation The impact of delay measurement. Two new factors that affect the range error are proposed: the amplitude-frequency characteristic and the non-quadrature phase difference of the product demodulation. The delay drift and their mutual restraint caused by each of them are discussed. The conclusion of this paper can be generalized to the calculation of the sidetone delay caused by the asymmetry of the signal spectrum caused by other factors and the asymmetry of the phase shift. The article gives the design calculation example.