新型专业卫星数字电视解码器(IRD)通过运行防止非法信号干扰的软件，实时分析卫星数字电视信号的特征，从而提前发现外来非法干扰信号并实施预警。

New type of professional IRD, by running the software for preventing the illegal interfering signal, IRD analyzes the characteristic of satellite DTV signal in real time, then found external illegal.

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分析卫星数字电视接收系统的性能以及卫星数字电视接收机中R-S解码器、卷积解码器和QPSK解调器等部分电路对系统抗噪声性能的贡献。

This paper analyses the anti-noise performance of digital satellite TV receiver system, and discuses the anti-noise capability of R-S decoder, of convolutional decoder and of QPSK demodulator.

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数字机顶盒也称数字电视综合解码器或数字电视综合接收机，通过数字机顶盒可以使用现有的模拟电视收看数字电视节目。

The digital Set Top Box is also called IRD (integrated receive decoder). Through the Set Top Box, we can receive the digital TV signals with analog TV.

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