接着介绍了遥控遥测常用的数字调制信号的软件调制解调的数学模型和实现方法。

Then, the paper introduces the math module and achieving method of software modulation and demodulation of common digital modulating signals used in telecontrol & telemetry system.

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本文基于软件无线电的思想，研究并实现了以 多媒体计算机声卡和DSP为基本 硬件平台的PSK信号的软件调制解调。

In this paper, according to the thinking of software radio, a PSK soft-modulation and soft-demodulation system based on audio-card and DSP is studied and implemented.

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传送这个1 Mb的软件用时要1小时左右，“堪比”20世纪90年代调制解调器的速度。

Uploading this one-megabyte software update takes around an hour, so its speed is comparable to that of a 1990s modem connection.

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