基于USB输入的PCM软件分路技术研究

USB INPUT-BASED PCM DECOMMUTATION BY SOFTWARE

本文简要介绍了遥测PCM数据分路技术的现状,提出了“先输入、后分路”的新思路,即先利用计算机通用串行总线(USB)把遥测PCM数据输入到计算机,然后用软件实现遥测PCM数据分路的新方法,并介绍了PCM-USB转换接口的硬件、驱动程序设计,软件分路中的帧、子帧同步策略和软件实现方法。

This paper describes the current status of telemetry PCM data decommutation and presents a new concept of “input first and then decommutation”. This is a new method with which PCM data are input into a computer via the universal serial bus（USB） first and then decommutation of the telemetry PCM data is performed by software. It also explains the hardware and driver design of the PCM-USB conversion interface ,the frame and sub-frame synchronization strategies and the implementation of decommutation by software.