The phase-frequency and amplitude-frequency responses of the system were analyzed and experimented, which reasonably explains why the hysteretic curve changes with input signal frequency.

文中对所建立的系统进行了相频和幅频特性的理论分析和实验，合理地解释了此系统的迟滞曲线随输入信号频率变化的原因。

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An analog signal is composed of four basic components: DC and AC magnitudes, frequency, and phase.

模拟信号由直流和交流分量、频率和相位四部分组成。

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According to some embodiments of the present invention, a phase frequency detector includes a temperature sensing circuit.

依照本发明的某些实施例，相位频率检测器包括温度感测电路。

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Although they have not been found to cause any harm, the cables on conventional pylons, which transmit a three-phase alternating current, generate a strong electric field and a continuous buzz of low-frequency radio waves.

ECONOMIST: Monitor

Phasor measurements track the amount of stress placed on the electric power grid by providing granular data about frequency, voltage and phase angle conditions in real-time.

FORBES: Can GridEye Save America's Power Grid?