What does frequency response mean?
Frequency response refers to the phenomenon that when an audio signal output at a constant voltage is connected to the system, the sound pressure generated by the speaker increases or decreases with the change of frequency, and the phase changes with the frequency. This sound pressure and phase The associated change relationship with frequency is called frequency response. It also refers to the frequency range that the sound system can play back within the allowable range of amplitude, and the amount of signal change within this range is called the frequency response, also known as the frequency characteristic. In the rated frequency range, the ratio of the maximum value to the minimum value of the output voltage amplitude is expressed in decibels (dB) to express its unevenness. Frequency response usually refers to the change of the impedance of the system or metering sensor with frequency in the concept of power quality.
It refers to the response characteristics of the system or component to sinusoidal input signals of different frequencies. The frequency response characteristics of the system can be directly obtained by two methods: (1) mechanism model—transfer function method; (2) experimental method.
The steady-state response characteristics of the system to sinusoidal signals. Steady state is the state of the system's motion after the transition process ends. The frequency response of the system consists of amplitude frequency characteristics and phase frequency characteristics. The amplitude-frequency characteristic indicates the relationship between gain increase and decrease and signal frequency; the phase-frequency characteristic indicates the phase distortion relationship at different signal frequencies. According to the frequency response, the system's ability to reproduce signals and filter noise characteristics can be evaluated intuitively. In control theory, the stability and other motion characteristics of the system can be analyzed more conveniently based on the frequency response. The concept of frequency response is also important in system design. Introducing a proper form of correction device (see control system correction method) can adjust the characteristics of the frequency response and improve the performance of the system. The analysis and design method based on frequency response is called frequency response method. It is one of the basic methods of classic control theory.
It is also called frequency characteristic in control engineering. It is the steady-state response characteristic of the system to sinusoidal signals of different frequencies.
1. The frequency characteristics can be determined not only by the aforementioned transfer function, but also by experimental methods. This is particularly convenient for engineering applications for components or systems that are difficult to formulate differential equations.
2. Because the frequency response method mainly analyzes the system through the graph of the open-loop frequency characteristics, it has the characteristics of intuitive image and less calculation.
3. The frequency response method is not only applicable to linearly stationary systems, but also to the analysis of purely lagging systems and partially nonlinear systems whose transfer function is not a rational number.
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