输出信号

This article introduces the hardware structure and the software design of a digital video mixer ,which controls the digital video mix processing chip by the PIC single chip microcomputer intermitting technique.

介绍了一种利用P IC单片机中断技术来控制数字视频混合处理芯片，实现将2路或多路数字视频信号混合成1路或多路输出的数字视频混合器的硬件构成和软件设计。

A better algorithm and corresponding real time implementation scheme are proposed. By methodic arranging the clocks of CPU and AD/DA, the scheme can not only scale the pitch in two octave range effectively, but also process the real time input audio for synchronous scaling output. The experimental results on Windows platform indicate the modest CPU and memory consumption, so as to meet the requirement of real time applications.

改造后的实时变调算法与实现方案通过合理控制CPU时钟和AD/DA时钟的时序关系，不仅能够在两个八度音范围内进行有效的变调，而且能够对实时输入的音频信号进行同步变调输出，在Windows平台上验证实验还表明新方案具有较低的CPU占用率和内存消耗，能够满足实时应用的要求。

The digital frequency source this paper researched uses high integrated DDS chip AD9851 as frequency sources and signal mirac processors AT89C51 as system control center, it can output 10Hz-20MHz signal with high-precision and high stability frequency. The evenness of signal within the range of 10MHz is low to 0.1dB degree, and the smallest step is low to 10Hz frequency.

本课题研究的数字频率源采用高集成度DDS芯片AD9851作为频率源；以单片机AT89C51作为系统的控制中心，实现了10Hz～20MHz的高精度、高稳定度的频率输出。10MHz内信号幅度的平坦度为0.1dB、频率最小步进为10Hz。

Results The expression of the Mahoganoid protein and its mRNA was showed by brown staining and observed in the Leydig cells, spermatogonia, primary spermatocytes, spermatids, Sertoli cells, and peritubular myoid cells of testicular tissues and principal cells, basic cells and epithelial cells of epididymal tissues.

结果1。免疫组化法检测Mahoganoid蛋白的实验结果显示的棕色阳性信号可见于各天龄段大鼠睾丸的生精细胞、支持细胞、间质细胞和管周肌样细胞以及附睾输出管的高柱状、低柱状上皮细胞和附睾管的上皮细胞、主细胞、基细胞。其中Mahoganoid蛋白主要表达于胞膜和胞浆。

Fourth, it conducts the formula deduction, analysis and numerical calculations of the noncollinear quasi-phase matching gains and the output parametric spectrum, which leads to the conclusions that under the same circumstances, the gains of noncollinear interaction will be much less than those of the collinear interaction, and consequently the noncollinear interaction possesses the larger acceptance bandwidths than that of the collinear interaction.

对非共线准相位匹配的增益和输出参量光的允许波长进行了公式推导、分析和计算，得到了允许信号光波长的精确公式和关系曲线。

Power amplifier has high request for signal nondistortion, waveshape precision, output power, and function stability. Therefore, Power amplifier is a technical difficulty in the design of relay protection testing device.

功率放大器在信号不失真、波形精度、输出功率、运行稳定性等方面都有较高要求，因此是继电保护测试仪设计中的一个技术难点。

A signal reconstruction algorithm based on the output signal spectrum is studied, the experiment data prove that the algorithm can reconstruct the nonuniformly sampling signal, the research of this algorithm provided theory basis for its application

研究了一种基于系统输出序列频谱的滤波重构算法，通过原型电路的实际数据，证明该算法可以有效地重构非均匀采样信号，为该算法的应用提供了理论基础。

Besides,the characters and functions of the chips are also analyzed and depicted. The CPU is TMS320VC5409, the hardware is designed according to the function modules, these modules are power supply module、signal opsonic module、data processing module、time clock module、UART module and pulse output module.

系统的核心是数字信号处理器的TMS320VC5409，以模块化的设计方法将仪表的硬件按功能分为几大模块进行设计，分别为：电源模块、输入调理模块、数据处理模块、时钟模块、通信模块、脉冲输出模块。

Fast overrange detect and signal monitor with serial output.

快速超量程检测和带串行输出的信号监控器。

The rotproof and wearable kinds of pressure transducers and transmitters are suitable for pressure measurement on various occations of chemical fibre, plastic, rubber and petrifaction . They can succeed in measuring and controlling pressure with our Series PW intelligent digital pressure gauges.

防腐耐磨型压力传感器及变送器使用于塑料、化纤、石化等各种特殊场合的压力测量，与我公司的PW系列智能数字压力表配套使用可实现压力的测量与控制，变送器系列采用24V直流供电，输出标准信号便于计算机采集。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。