Although there is no essential difference between the basic framework of the process of processing signals, there are also obvious differences, as follows: There are significant differences in the sources of the two that can be connected. Ordinary TV can only receive: (1) RF signal terminal RF, that is, the signal after the video and audio are modulated. During the modulation process, the signal has a certain loss and distortion, so the quality of the image and sound is poor. (2) Composite video terminal Video, the interface is connected to the mixed video signal. It is a hybrid video signal, without the process of RF RF signal modulation, amplification, detection, demodulation, etc., the signal fidelity is relatively good. The resolution is generally 350-450 lines, but it is an analog interface. . (3) The S terminal is also called SUPEI~VIDEO. It separates the luminance and chrominance signals and avoids mutual interference of luminance and chrominance signals when the mixed video signal is output. In addition to connecting the above signals, the digital high-definition TV can also be connected: (1) The color difference terminals are usually marked with YPbPr and YcbCr. The former represents the progressive scan color difference output, and the latter represents the interlaced color difference output. Through the color difference terminal, you can input a variety of level signals, from the most basic 480i to 480p of the multi-frequency scanning, even 720p, 1080i and so on. (2) VGA terminal, also called D-Sub interface. This is a D-type interface with a total of 15 pins, divided into three rows, five in each row. The VGA interface still transmits analog signals. (3) DVI terminal, which is a digital video input port. The main advantage of this interface is that it is fast, the transmitted digital signal does not need to be converted, and the transmitted signal is not attenuated. The loss of signal is avoided, and the sharpness and detail expression of the image are greatly improved. (4) HDMI terminal, high definition multimedia interface. The HDMI interface provides up to 5 Gbps of data transmission bandwidth for uncompressed audio signals and high-resolution video signals. At the same time, there is no need to perform digital/analog or analog/digital conversion before signal transmission to ensure the highest quality video and audio signal transmission. The advantage of using HDMI is that only one HDMI cable is needed to transmit video signals at the same time, instead of requiring multiple wires to connect at the same time; at the same time, higher audio can be achieved by digital/analog or analog/digital conversion. And video transmission quality.
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2. The different signal flow of the signal flow is mainly reflected in two aspects: First, the two connected signal sources are different, HDTV can connect more signal sources, including analog signals and digital signals; second, HDTV processes image signals The signal is digitized to achieve format conversion and image quality improvement. The above figure and the following figure are block diagrams of the two. By comparison, the above differences can be found. 
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