噪声控制

This paper uses microcontroller AT89C51 as the control core,and designs a practical noise annunciator.

利用 AT89C51单片机为控制核心，设计一种实用的噪声报警装置。

Automatic Volume Control – This feature eliminates the need for constant volume adjustment in variable noise situations such as driving.

自动音量控制-此功能，不再需要不断音量调整在变噪声情况下，如驾驶。

QAVC? Quiet Automatic Volume Control?

无噪声自动音量控制

This paper analyzes the factors that affect the performance of silicon oil fan clutch and the key configuration.A kind of silicon oil fan clutch has been developed,performance and experimental data of silicon oil fan clutch are summarized through bench testing.The test results show that the optimized clutch can make a response to temperature and has less consumption of power.

硅油风扇离合器不仅可以减少发动机有效功率的损耗，改善发动机的经济性，提高发动机寿命，而且能有效的降低发动机噪声，具有广阔的应用前景[1]。1结构及工作原理硅油风扇离合器是用硅油作介质，利用硅油高粘度的特性来传递转矩，其结构如图1所示，当发动机负荷增加时，水温升高，从散热器吹来的热空气使双金属感温片受热而扭转变形，带动阀销一起转动并通过感温片变形量的大小控制进油阀开度。

The topics covered include the basic concepts of information theory--entropy, mutual information, channel capacity, information rate, Shannon's noiseless coding theorem and Shannon's fundamental coding theorem; modeling of information sources--zero-memory and Markov models; modeling of information channels--BSC and BEC channels, additivity of information and cascaded channels; construction of compact source codes--Kraft inequality, compact codes, Huffman and LZW compression codes; and analysis and design of error-control channel codes--Hamming distance, binary linear codes and the parity-check matrix, Hamming codes, checksum codes, cyclic codes and the generator polynomial and CRC codes.

课程的内容包括：信息论的基本概念（熵、交互信息、信道容量、信息率、 Shannon无噪声编码定理和Shannon基本编码定理）、信源模型（无记忆模型和Markov模型）、信息信道模型（BSC 和 BEC模型、信息的可加性和级联信道），紧致信源编码设计（Kraft不等式，紧致编码，Huffman 和LZW压缩编码）以及差错控制信道码的设计与分析（海明距离，二元线性码，奇偶校验矩阵，海明码，校验和，循环码，生成多项式和CRC码）。

Due to its smaller computus, faster convergence rate and smaller misadjustment, and its performance is not influenced by existing uncorrelated noise, the proposed algorithm can be applied perfectly in the adaptive noise cancellation system and achieves favorable performance in lower SNR situation.

该算法计算量小、易于控制，具有快速的收敛速度和较小的失调，不受已存在的非相关噪声的影响，可很好地应用于自适应对消系统中，且在低信噪比环境中仍能保持良好的性能。

It is a generalization of the nonlinear diffusion equation proposed by Perona-Malik and the method presented by Cuesta, and interpolates between the nonlinear parabolic equation and the nonlinear hyperbolic equation, thus can effectively control the diffusion process so that noises can be removed and details of the image such as edges can be preserved as much as possible simultaneously.

提出了一种包含对时间的分数阶导数的非线性扩散方程，它是对Perona-Malik的非线性扩散方程和Cuesta提出的方程的推广，介于非线性抛物方程和非线性双曲方程之间，从而能有效地控制扩散过程，使得在去除图像噪声的同时能够尽可能地保留图像的边缘等细节信息。

The function of the peripheral circuit controller was to manipulate a/d sampling and to buffer data.

而外围电路控制器的主要作用则是控制a/d芯片采样和上、下游流动噪声信号的数据缓存。

Next, in the scheme for teleportation of an arbitrary multipartite GHZ-class state by one EPR pair, only one EPR pair and 3 classical bits are needed, which greatly lessens the oppressiveness of both quantum and classical channels. Then, in the scheme for deterministic, unilateral and controlled teleportation via cavity QED, Alice can determinately send her state to anyone of her agents, whereas the agents can not, with the channel being noiseless. What the agents can do is just to control the teleporting process, which enhance the security of the communication.Besides,based on the schemes discussed above,it is easy to see the character of an entangled state which can accomplish deterministic teleportation via cavity QED.

利用一个EPR对实现n-体类-GHZ态的量子隐形传态方案，整个通讯过程只需要一个EPR对和3 cbits的经典信息，大大节省了物理资源，缓解信道压力；利用非对称类-W态实现确定的单向受控量子隐形传态，在没有噪声的条件下，Alice可以将量子信息准确无误地发送给任一个客户，但每一个客户只能控制配合整个信息的传输过程，客户之间不能实现确定的信息传递，这样便保证了信息的安全性。

They point out that volume control topologies are not perfectly linear, nor are buffer stages perfectly noiseless and distortionless.

他们指出，音量控制拓扑结构不完全线性的，也不是完美的缓冲阶段噪声和失真。

Plunder melds and run with this jewel!

掠夺melds和运行与此宝石！

My dream is to be a crazy growing tree and extend at the edge between the city and the forest.

此刻，也许正是在通往天国的路上，我体验着这白色的晕旋。