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码速调整是数字复接的基本技术之一。本文提出一种新的码速调整方案——模型法正/零/负码速调整。这种方法具有优良的同步/准同步兼容性,而且通过模型参数设计可明显降低码速调整引入的塞入抖动,其主要性能优于正码速调整。 正/零/负码速调整和正码速调整都是CCITT建议用于国家间数字通道的两种码速调整方式。本文首先从正码速调整在系统应用中的问题和正/零/负码速调整存在的技术问题出发,说明模型法正/零/负码速调整的研究背景;然后介绍模型法正/零/负码速调整的原理与性能;最后简述模型法正/零/负码速调整在数字通信系统中的应用。
Code speed adjustment is one of the basic digital multiplexing technology. This paper presents a new code speed adjustment scheme - model method is / zero / negative code speed adjustment. This method has excellent synchronization / quasi-synchronization compatibility, and through the model parameter design can significantly reduce the jitter introduced by the code rate adjustment, its main performance is better than the positive code speed adjustment. Both positive / zero / negative code rate and positive code rate adjustment are two types of code rate adjustment recommended by CCITT for digital channels between countries. In this paper, starting from the problem of positive code speed adjustment in system application and the technical problem of positive / zero / negative code speed adjustment, the research background of positive / zero / negative code speed adjustment of model method is introduced; Negative code speed adjustment principle and performance; Finally, the model method is / zero / negative code speed adjustment in digital communication system.