The system stability is determined by analyzing the amplitude-frequencycharacteristics of closed-loop transfer function.
通过分析闭环传递函数的幅频特性，对系统的稳定性进行了判定。
2
When frequency sweeping method being used properly for measuring amplitude-frequencycharacteristics, the analysis and estimation of errors in measurement results could be avoided.
正确使用扫频法测量幅频特性，可以避免大量测量结果中误差的分析与估算。
3
The study on speech signal formant abstracted by LPC shows that it can also be abstracted by adopting phase-frequencycharacteristics and logarithmic amplitude-frequencycharacteristics.