Difference between monitor system monitor and home TV
First, the definition of the image: Since the traditional TV receives the RF signal emitted by the TV station, the bandwidth of the video image corresponding to this signal is usually less than 6M, so the resolution of the TV is usually about 400 lines. But the sharpness of front-end equipment of the surveillance system is usually more than 400 lines, which requires the monitor to have a high image resolution. Therefore, the professional monitor should have a bandwidth compensation and booster circuit in the channel circuit compared to the traditional television. The band is wider and the image clarity is higher.
The second is the degree of color reproduction: If it is said that the definition is mainly determined by the amplitude and frequency characteristics of the video channel, the reduction is mainly caused by the colors of the three primary colors red (R), green (G), and blue (B) in the monitor. The phase signal is determined by the phase of the luminance signal. Since the monitor usually observes static images, the requirement for the color reproduction of the monitor is higher than that of the television. Therefore, the channel for the viewing channel of the professional monitor should have the brightness, color processing, and R, G, and B processing. Accurate compensation circuit and delay circuit to ensure phase synchronization of light/color signals and R, G, B signals.
The third is the stability of the whole: when the monitor forms a closed-circuit monitoring system, it usually needs 24 hours a day and 365 days of continuous power-on use every year (while the TV usually only works a few hours per day), and some monitors are The application environment may be rather harsh, which requires a higher reliability and stability of the monitor. Compared with televisions, in terms of design, the monitor's current, power consumption, temperature and resistance to electrical interference, the ability and margin of electrical shock, and average time between failures are much greater than those of televisions. At the same time, the monitor must also Use a fully shielded metal shell to ensure electromagnetic compatibility and interference performance; in the selection of components, the characteristics of the components used in the monitor, such as voltage resistance, current, temperature, humidity, etc., must be higher than the components used in the television; In the installation and debugging, especially the components and the aging process requirements, the monitor's requirements are also higher. The aging of the whole TV set is usually about 8 hours at the normal temperature on the assembly line, and the whole monitor is Aging needs to be electrified for more than 24 hours in the aging line of a high-temperature/high-humidity confined environment to ensure the stability of the whole machine.
From the above analysis, if you use a TV as the monitor of the monitoring system, the components used in the TV are not suitable for use, except that you may feel that the image is blurred (lower definition and poorer color reproduction). Intermittent continuous use requirements. If you force the use of a TV as a monitor, it is prone to malfunction. If it is severe, it may cause an accident due to the high operating temperature of the TV.
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