分析了工作原理和数学模型，研究了它的抗干扰特性，给出了离散随机脉位序列调制码的产生方案。
The block diagram of the system is given and its working principle and mathematic model are analyzed. And also, its anti jamming performances are studied.
现研究了一种具有线性相位的最大抽取FIR余弦调制滤波器组，该滤波器组中每一个滤波器都具有线性相位，且由原型滤波器经余弦序列调制得到。
In this paper we study linear phase maximally decimated FIR cosine modulated filter banks, in which each filter has linear phase and is obtained by modulating the prototype filter by cosine sequences.
应用扩频原理，能大大改善水印嵌入的不可感知性。但由于采用扩频调制后，一个水印信息要用一个周期的伪随机序列调制，因此会增加嵌入的水印量。
Equally, spreading spectrum technology can improve the performance of watermark technology greatly, but it will increase the capacity of channel and the calculation of the algorithm as cost.
应用扩频原理，能大大改善水印嵌入的不可感知性。但由于采用扩频调制后，一个水印信息要用一个周期的伪随机序列调制，因此会增加嵌入的水印量。
Equally, spreading spectrum technology can improve the performance of watermark technology greatly, but it will increase the capacity of channel and the calculation of the algorithm as cost.
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