磁性编码器及其应用

本文简要地论述了磁性编码器的结构、工作原理以及各类磁记录媒体的特性，并对磁性编码器的应用及其发展前景进行了展望，指出磁性编码器已成为发展高技术产业的关键之一。     

基于HI3519的回转型编码器可靠性设计及应用

针对某瞄镜设备选用回转型编码器进行OLED屏信息分级显示切换时，编码器旋转过程中的瞄镜综合处理系统常出现回应异常、人机交互迟滞等现象，该文在研究编码器特性的基础上，采用硬件设计加前端预处理电路及软件指令判读优化流程的方法，开展基于HI3519处理器的编码器可靠性的设计应用，实验对比改进前后编码器的输出波形，改进后的编码器输出回路相位正常，综合管理系统判读异常现象得以解决，信息分级切换显示正常。     

光电编码器的理论研究

本文从光电编码器的基本工作原理及常用的编码方法介绍入手,并在此基础上对光电编码器的具体应用及其发展趋势进行了研究。期望通过本文的研究能够对推动光电编码器的发展有所帮助。     

非接触式旋转编码器综述

自动化系统在工业和汽车领域应用越来越广泛，对低成本高可靠性的旋转编码器和角编码器的需求也在与日俱增。     

FPGA芯片在开关磁阻电动机位置检测中的应用

在开关磁阳电动机的应用中，经常使用光电编码器对其转子位置进行实时检测，所以要对电编码器输出的脉冲进行计数。文中提出了一种用FPGA芯片进行光电编码器输出脉冲计数的方法，和控制器AT89C2051配合使用，效果十分理想。     

多媒体应用的图像压缩及其标准MPEG—1（上）

本文叙述了多媒体应用的图像压缩及其标准ＭＰＥＧ－１，主要内容有ＭＰＥＧ－１标准的图像格式，编码器，图像复用编码器，解码器和编辑功能。     

用单片机实现编码器功能

文章通过分析编码器ＶＤ５０２６的工作过程，说明了用程序模拟编码器的方法。并介绍了应用该技术设计的红外遥控键盘。     

光栅编码器介绍与应用

介绍了光栅编码器在精密机械方面的应用。从编码器的原理、技术参数和使用要点几个方面把光栅编码器的使用和优点呈现出来。通过具体的应用实现,去分析光栅编码器精度的提升,这对光栅编码器发挥最大效能有着重要的意义。     

Avago推出新精简高度整合增量型磁性编码器

Avago（安华高科技）宣布推出一款新精简高度整合增量型磁性编码器．适合速度侦测、旋钮控制以及旋转编码器应用。Avago具有高度价格竞争力的AEAT-601B编码器采用防护型塑料封装设计以提高耐用度与高温效能表现，     

优先编码器74LS147功能扩展

本文提出了二一十进制优先编码器74LS147转换为二进制优先编码器的级连式设计法，通过给74LS147增加扩展输入端、扩展输出端，实现了按芯片优先级别进行连接，通过对初级编码器输出及系统输出的分析，提出了系统输出端低3位及高（n-3）位的实现方法，并应用次级编码器解决了系统输出端高（n-3）位获取时的困难，设计的二进制优先编码系统具有附加逻辑简单扩展功能强等优点。     

Refreshment need metrics for improved shape and texture object-based resilient video coding

Video encoders may use several techniques to improve error resilience. In particular, for video encoders that rely on predictive (inter) coding to remove temporal redundancy, intra coding refreshment is especially useful to stop error propagation when errors occur in the transmission or storage of the coded streams, which can cause the decoded quality to decay very rapidly. In the context of object-based video coding, the video encoder can apply intra coding refreshment to both the shape and the texture data. In this paper, shape refreshment need and texture refreshment need metrics are proposed which can be used by object-based video encoders, notably MPEG-4 video encoders, to determine when the shape and the texture of the various video objects in the scene should be refreshed in order to improve the decoded video quality, e.g., for a given bit rate.     

Adaptive shape and texture intra refreshment schemes for improved error resilience in object-based video coding

Video encoders may use several techniques to improve error resilience. In particular, for video encoders that rely on predictive (inter) coding to remove temporal redundancy, intra coding refreshment is especially useful to stop temporal error propagation when errors occur in the transmission or storage of the coded streams, since these errors may cause the decoded quality to decay very rapidly. In the context of object-based video coding, intra coding refreshment can be applied to both the shape and texture data. In this paper, novel shape and texture intra refreshment schemes are proposed which can be used by object-based video encoders, such as MPEG-4 video encoders, independently or combined. These schemes allow to adaptively determine when the shape and texture of the various video objects in a scene should be refreshed in order to maximize the decoded video quality for a certain total bit rate.     

Low-complexity 3D-DWT video encoder applicable to IPTV

3D-DWT encoders are good candidates for applications like professional video editing, IPTV video surveillance, live event IPTV broadcast, multispectral satellite imaging, HQ video delivery, etc., where a frame must be reconstructed as fast as possible. However, the main drawback of the algorithms that compute the 3D-DWT is the huge memory requirement in practical implementations. In this paper, and in order to considerably reduce the memory requirements of this kind of video encoders, we present a new 3D-DWT video encoder based on (a) the use of a novel frame-based 3D-DWT transform that avoids video sequence partitioning in Groups Of Pictures (GOP) and (b) a very fast run-length encoder. Furthermore, an exhaustive evaluation of the proposed encoder (3D-RLW) has been performed, analyzing the sensibility of the filters employed in the 3D-DWT transform and comparing the evaluation results with other video encoders in terms of R/D, coding/decoding delay and memory consumption.     

The sarnoff engine: A massively parallel computer for high definition system simulation

This paper describes the Sarnoff Engine, a 1.6 TeraFLOP, real-time, high definition, video and image processing computer. It is a second generation, scalable, linear array, multiuser, MIMD architecture focused on the applications of real-time high definition video and image processing (data compression encoders and decoders), 3D/4D data visualization, and neural network development.     

A bit allocation scheme for a class of embedded wavelet video encoders

In this paper, we investigate bit allocation strategies for a class of embedded wavelet video encoders. They take advantage of the precise control that such coders have over the bit-rate of each frame. We first show that a piecewise-linear model suits the rate × distortion characteristics of these encoders better than an exponential model, specially in low bit-rate applications. Then, we use an effective iterative procedure for dealing with the problem of frame dependency which yields improved rate × distortion results. Two types of embedded wavelet coders, using scalar and vector quantization, are tested. The results are encouraging, showing that the adoption of an adequate rate-control strategy can improve both objective and subjective quality of video sequences encoded using such embedded wavelet video encoders.     

Bit-Rate Efficiency of H.264 Encoders Measured With Subjective Assessment Techniques

In this study we evaluated the bit-rate efficiency of current hardware H.264 encoders as compared to that of established MPEG-2 hardware encoders. To estimate bit-rate efficiency, we measured the subjective video quality of MPEG-2 encoded material processed at three bit rates: 8, 12, and 16 Mbps, and determined the bit-rate at which H.264 encoded material produced similar subjective video quality. The MPEG-2 and H.264 bit rates that resulted in the same perceived video quality were used to estimate bit-rate efficiency.      

An adaptive congestion control scheme for real time packet videotransport

We show that modulating the source rate of a video encoder based on congestion signals from the network has two major benefits: the quality of the video transmission degrades gracefully when the network is congested and the transmission capacity is used efficiently. Source rate modulation techniques have been used in the past in designing fixed rate video encoders used over telephone networks. In such constant bit rate encoders, the source rate modulation is done using feedback information about the occupancy of a local buffer. Thus, the feedback information is available instantaneously to the encoder. In the scheme proposed, the feedback may be delayed by several frames because it comes from an intermediate switching node of a packet switched network. The paper shows the proposed scheme performs quite well despite this delay in feedback. We believe the use of such schemes will simplify the architecture used for supporting real time video services in future nationwide gigabit networks     

Rate control strategy for embedded wavelet video coders

An investigation into the use of rate-control strategies for embedded wavelet video encoders is presented. It is shown that the best model for the rate×distortion (R-D) curve of these encoders is piecewise linear. Also, an effective iterative procedure is proposed for dealing with the problem of frame dependency, which yields improved rate×distortion results     

Video encoder optimisation based on energy reservation property of DCT

To reduce the computational complexity for standard-based video encoders, an optimisation technique based on the energy reservation property of discrete cosine transform (DCT) is proposed and applied to both motion estimation and DCT. While proved to be computationally efficient, the algorithms introduce no obvious quality loss and can be easily embedded in an existing video encoder.