RTDX在PSTN文件隐传系统中的应用

Application of RTDX in PSTN File Hidden Transmission System

在PSTN文件隐传系统中,由于DSP芯片晶振频率的不稳定以及其与计算机设备的晶振频率不匹配,导致在传输语音数据过程中会发生数据采样点的丢失,而隐写算法对采样点要求非常高,丢失采样点会导致接收端无法正确恢复密文信息。介绍了TI公司提出的RTDX能够在不中断DSP程序执行的情况下,通过JTAG接口实现DSP与主机的实时数据传送,而不会产生数据丢失的问题,应用到PSTN文件隐传系统中,为接收端正确恢复密文信息提供了重要的保障。

In the PSTN file hidden transmission system, because of the DSP chip crystal oscillator frequency instability and its computer equipment crystal frequency mismatch, data sampling points are lost in the process of transmitting speech data, and the steganographic algorithm for sampling requirements are very high, the loss of sampling points causes the receiver can not correctly restoring the ciphertext. TI＇s RTDX can not interrupt the DSP program execution through the JTAG interface for DSP with a host of real-time data transmission, without generating the missing data problem,which is applied to the PSTN file hidden transmission system and can offer protection for receiving correct recovery ciphertext information.