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前言进入21世纪,广播电视技术的全面数字化逐步走向成熟,电视节目的制作、播出、传输和存储各个环节广泛应用数字技术。当前大多数电视台的制作和播出系统都是模拟与数字设备共存,标清与高清兼容。在电视信号传输和切换处理时,由于电视信号在模数转换及数字信号处理的过程中,视
Introduction In the 21st century, the full digitalization of radio and television technology has gradually become mature. Digital technologies are widely used in all aspects of the production, broadcasting, transmission and storage of television programs. Most of the current television production and broadcast systems are analog and digital devices coexist, SD and HD compatible. In the television signal transmission and switching process, due to television signals in the analog-digital conversion and digital signal processing in the process, depending on