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本文给出了一种按我国“电视文字广播试验规范(WG—84)”研制的接收机的构成、多工信号处理方法及主要程序流程。其特点是部分硬件软件化,从而简化了电路结构;信号处理用微机芯片进行,而且程序编制比较合理。此外,为适应我国拟将文字广播用于电视教育等领域的需要,提出并实现了兼容地传送三路多工数字伴音信号的方案,其处理与文字信号统一进行。鉴定和转产结果表明,该接收机性能良好,可投产和应用。
This article presents a receiver according to China’s “Television Text Broadcasting Test Specification (WG-84)” the composition of the multiplex signal processing methods and the main program flow. Its characteristics are part of the hardware software, thus simplifying the circuit structure; signal processing using computer chips, and programming more reasonable. In addition, in order to meet the need of our country to use the text broadcasting in the fields of television education and other fields, a scheme of compatible transmission of three-way multiplexed digital audio signals is proposed and implemented. The processing and the text signal are unified. Identification and conversion results show that the receiver performance is good, can be put into operation and application.