数字信号

At present, the analog filtering method for LoranˉC is mo stly used, but it does denoise capability is not very satisfactory, and with traditional digital processing methods, the s ignals can't be received in complicated environment.

目前国内罗兰C接收机主要采用模拟滤波方法，去噪效果较差；而传统数字处理方法难以实现复杂环境下的信号接收。

An apparatus for recording a digital information signal in slant tracks on a longitudinal magnetic record carrier (10) is described.

描述了把数字信息信号记录在纵向磁记录载体（10）的倾斜磁道中的设备。

According to the characters of the time series signals by dynamical measure, a new method for removing the singular points, absolute mean value method,was put forward, in which the range of the threshold W was determined.

根据动态测试中数字时序信号的特点提出了一种剔除坏点的新方法——绝对均值法，并给出了绝对均值法中阀值W确定的范围。

Given multi-clock domain systems integrated in the single chip,the number of asynchronous greatly increased, the metastability has increasingly important effects on the reliability of the PLDs.

在用P L D实现同步数字系统设计时，如果所有模块共用同一个时钟信号，系统中所有的寄存器都由该时钟的边沿来触发，这样的时钟设计·2006第02期·ELECTRONICS QUALITY可以使整个设计流程易于处理，顺利实现综合、布局布线到静态时序分析。

SVD is used to extract singular value which is embedded copyright protection into digital audio based on modular arithmetic.

将数字音频信号用奇异值分解所得的奇异值作为水印的嵌入系数，对该系数采取模2取余的方法作为水印嵌入策略。

In this paper, a novel algorithm of address generation using logic operation for multidimensional array is proposed.

引 言在数字系统的行为级描述中，数组是一种常用的表示信号、常量或变量的方式。

The1Hz~lMHz input measured pulse signals of the digital frequency meter can be used for measuring frequency, period, pulse width and duty ratio,etc.The test results stably display 3 seven-segment numeric tubes, and the measuring ranges may be switched over automatically. The measuring error is equal to or less than 0.1％.

该数字频率计的lHz～1MHz输入被测脉冲信号具有频率测量、周期测量、脉宽测量和占空比测量等多种用途；其测试结果由3只七段数码管稳定显示，测试量程可自动切换、测量误差小于等于0.1％。

In chapter five, the base band signal process of CDMA base station simulator system is introduced, including channel coding and decoding, interleave and disinterleave, PN sequence generator, orthogonal spread spectrum and quadrature Spreading, scrambling code, power control, digital forming filter, the capture and track of PN code, dispreading and demodulation, etc. Some FPGA design graphic and waveform simulation of base band transmitter module is given and realization algorithm of base band receiver is discussed in detail.

第五章介绍了CDMA基站仿真系统的基带信号处理过程，包括信道编译码、交织与去交织、PN码发生器、正交扩频与四相扩频、扰码、功率控制、数字成形滤波器、PN码的捕获与跟踪、解扩与解调等，并给出了基带发射机模块的部分FPGA设计原理图和波形仿真，详细论述了基带接收机模块的实现算法。

School of Information Engineering,Zhengzhou University,Zhengzhou 450052,ChinaA novel chirp-typed watermarking scheme which uses the properties of index additivity and orthonormality of fractional Fourier transform to embed watermark in the different fractional Fourier domain is presented.

提出了一种新的分数阶Fourier域Chirp类数字水印方案，该方案利用分数阶Fourier变换基函数的正交性和旋转相加性，在不同的分数阶Fourier域嵌入Chirp水印，并利用分数阶Fourier域Chirp信号的聚集性进行盲检测。

Experimental results show output signals' characteristic is identical to the Logistic Map's.

实验结果表明，输出混沌信号与logistic映射的分析结果一致，这说明了数字混沌产生器的有效性。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。