In wireless surveillance, we often refer to RF signals. So what is a RF signal?
The RF signal is an alternating current flowing through the conductor, and an alternating magnetic field is generated around the alternating current. The alternating magnetic field induces an alternating electric field in the vicinity of the alternating magnetic field. When this is repeated, electromagnetic waves are emitted outward. In general, the higher the frequency, the more obvious this phenomenon is, ie, the higher the emission efficiency. This is the RF signal, which is based on the frequency. As for analog or digital, it refers to the carrier on it. Even if it is a digital signal, after Fourier series transformation, it is also decomposed into a series of sine wave combination, so it is generally No analog/digital ones. Modulation of digital signals should be based on the need to select a certain modulation method, and perform certain mathematical circuit conversion to suppress its too wide frequency band, improve efficiency.
Both analog and digital signals can be modulated to send RF signals, but the content of the transmission is different.
The RF signal is an alternating current flowing through the conductor, and an alternating magnetic field is generated around the alternating current. The alternating magnetic field induces an alternating electric field in the vicinity of the alternating magnetic field. When this is repeated, electromagnetic waves are emitted outward. In general, the higher the frequency, the more obvious this phenomenon is, ie, the higher the emission efficiency. This is the RF signal, which is based on the frequency. As for analog or digital, it refers to the carrier on it. Even if it is a digital signal, after Fourier series transformation, it is also decomposed into a series of sine wave combination, so it is generally No analog/digital ones. Modulation of digital signals should be based on the need to select a certain modulation method, and perform certain mathematical circuit conversion to suppress its too wide frequency band, improve efficiency.
Both analog and digital signals can be modulated to send RF signals, but the content of the transmission is different.
In order to realize the real-time monitoring of the coal mine ventilator, the finite state machine theory is used to analyze the state and control the working process of the Ventilator Control system. According to the operating conditions of theventilator, the control circuit is divided into different working states. These working states are combined into a specific limited state machine to realize the control and state transfer of the VFD, Thus, the reliability of ventilator control system can be improved.
Ventilator Control
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