编码器／解码器专用芯片及其应用

文章介绍几种主要应用于遥控遥测领域的新型编码器／解码器专用芯片。文中描述了这些芯片的应用特性与方法，并列举了部分应用实例供参考。     

编码器MC145026及解码器MC145027／MC145028

编码器ＭＣ１４５０２６及解码器ＭＣ１４５０２７／ＭＣ１４５０２８张兴明许多电子系统中需要远程多路或多点的数据通信和控制操作，采用并行方式，有接线多的缺点；采用多机串行方式，从机串行信号接收电路稍嫌复杂。编码器ＭＣ１４５０２６和解码器ＭＣ１４５０２７、...     

编码器PT2265和解码器PT2275的特性及应用

文章介绍遥控编码器ＰＴ２２６５和解码器ＰＴ２２７５的特性及其在红外遥控中的应用。     

基于英飞凌单片机的红外编／解码器设计

该文首先介绍了红外通讯的发展概况和红外编／解码器的原理。其次结合英飞凌公司XC16x系列16位单片机的特点详细介绍了红外编,解码器的实现原理和方法。最后搭建了硬件电路验证了红外编／解码器,并对测量结果进行了详细的分析和讨论。     

基于Multisim 12的正交编码器与解码器的电路设计与仿真

正交编码器用于检测旋转运动系统的位置和速度。因为正交编码器具有良好的抗噪声性能,能有效消除脉冲边缘震荡造成的干扰,在测速时能有效提高准确性,所以,正交编码与解码器的配合使用实现了对多种电机的闭环控制,从而达到精确控制。这里以Multisim 12软件为平台,模拟设计了正交编码与解码器,可以较直观地展现正交编码器与解码器的电路原理与工作过程,为深入了解、学习正交编码与解码器提供了更多途径,同时为Multisim 12学习者提供一些资料与便利。     

AVA双高清录播系统高清视频／VGA同步录制

近日．全球领先的录播系统生产商奥威亚科技推出双路双高清录播系统——PROPRE-2HD。系统可同时对1路高清视频和1路高清VGA信号（或2路高清视频信号）以及音频信号进行同步录制、直播,高清信号最高支持1080P．真正畅享1080P高清华丽视觉。     

基于Camera Link和VGA的高速图像采集处理系统

为了满足数字图像处理系统对高速高分辨率数字图像采集与处理的需求,根据VGA显示的原理,采用Camera Link摄像机和VGA接口,借助DSP和FPGA等大规模集成电路,设计开发一个高速图像采集处理系统,并利用该系统实现了图像的采集、处理与VGA显示。     

彩色多频显示器用新品IC WT8045

介绍了用于彩色多频显示器的新型集成电路（ＷＴ８０４５系列）的特点、排列次序表、引脚内容，重点介绍了主要功能应用，如同步信号鉴别、电源节能检波、应用电路，并提出了有关信息指南。     

一种复式组合的DVB-ASI解码器/编码器原理及应用（一）

本文介绍了一项专利产品,它是在DVB-ASI接口的MPEG解码器与编码器间实现多模式的复式组合,在DVB-S、DVB- C和T-MMB数字电视地面广播新国标的前端发送平台,以及以SDH为远程传送的传输平台上得到广泛应用,并为第二代信源编码AVS国标的普及预留广阔发展空间,它将为数字电视和数字媒体的基本建设提供一条高效率,低成本的可行方案。     

光CDMA编解码器的误差分析

对光CDMA编解码器在的误差及其对系统误码率的影响进行了分析,研究了表明：对于时间编码系统,编解码器的误差都将引起信噪比的损失而导致误率上升;光谱编码系统受误差的影响要比时间编码系统大;光谱编码系统的可容纳用户数比时间编码系统多,误码率也低得多。     

光纤延迟线编/解码器的研究

在光码分多址（ＣＤＭＡ）通信中,光延迟线编／解码器是实现全光编／解码的关键技术．本文对并行结构的光纤延迟线编／编码器的原理及构造方法进行了分析,并给出相应的实验结果。     

8B/10B编解码的IP核设计

研究了8B/10B编码的编码特点和内在相关性,并在此基础上介绍了一种用Verilog HDL设计8B/10B编解码逻辑描述的方法,将其嵌入到FPGA中或设计成ASIC,可构成一个资源使用少、速度快、可靠性高的IP核.文中着重介绍8B/10B编解码总体设计方案,详细描述其内部工作原理和实现.最后给出在Altera公司软件平台QuartusⅡ上进行EDA的综合和仿真结果.     

基于光纤布喇格光栅的光CDMA编/解码器

介绍了基于光纤布喇格光栅(FBG)的光CDMA编/解码器(E/D),分别给出了非相干光二维FBG编/解码器、振幅调制超结构光纤布喇格光栅(SSFBG)编/解码器、相干光二进制相移键控(BPSK)SSFBG编/解码器、可重构四进制相移键控(QPSK)SSFBG编/解码器的构造方法和最新研究进展,并分析了几种编/解码器的优缺点.     

A fast LDPC encoder/decoder for small/medium codes

Although Low-Density Parity-Check (LDPC) codes perform admirably for large block sizes — being mostly resilient to low levels of channel SNR and errors in channel equalization — real time operation and low computational effort require small and medium sized codes, which tend to be affected by these two factors. For these small to medium codes, a method for designing efficient regular codes is presented and a new technique for reducing the dependency of correct channel equalization, without much change in the inner workings or architecture of existing LDPC decoders is proposed. This goal is achieved by an improved intrinsic Log-Likelihood Ratio (LLR) estimator in the LDPC decoder — the ILE-Decoder, which only uses LDPC decoder-side information gathered during standard LDPC decoding. This information is used to improve the channel parameters estimation, thus improving the reliability of the code correction, while reducing the number of required iterations for a successful decoding. Methods for fast encoding and decoding of LDPC codes are presented, highlighting the importance of assuring low encoding/decoding latency with maintaining high throughput. The assumptions and rules that govern the estimation process via subcarrier corrected-bit accounting are presented, and the Bayesian inference estimation process is detailed. This scheme is suitable for application to multicarrier communications, such as OFDM. Simulation results in a PLC-like environment that confirm the good performance of the proposed LDPC coder/decoder are presented.     

光码分多址频域编解码技术

阐述了光码分多址（OCDMA）频域编／解码的主要技术：（1）利用光栅－掩膜板;（2）利用光纤光栅－环形器;（3）利用阵列波导光栅;（4）利用Mach-Zehnder干涉仪链,详细介绍了它们的结构和 编解原理以及特性。     

DS-OCDMA encoder/decoder performance analysis using optical low-coherence reflectometry

Direct-sequence optical code-division multiple-access (DS-OCDMA) encoder/decoder based on sampled fiber Bragg gratings (S-FBGs) is characterized using phase-sensitive optical low-coherence reflectometry (OLCR). The OLCR technique allows localized measurements of FBG wavelength and physical length inside one S-FBG. This paper shows how the discrepancies between specifications and measurements of the different FBGs have some impact on spectral and temporal pulse responses of the OCDMA encoder/decoder. The FBG physical lengths lower than the specified ones are shown to affect the mean optical power reflected by the OCDMA encoder/decoder. The FBG wavelengths that are detuned from each other induce some modulations of S-FBG reflectivity resulting in encoder/decoder sensitivity to laser wavelength drift of the OCDMA system. Finally, highlighted by this OLCR study, some solutions to overcome limitations in performance with the S-FBG technology are suggested.     

Low-power video encoder/decoder chip set for digital VCRs

This paper describes the realization of a video encoder/decoder chip set for the consumer use digital video cassette recorder (VCR). The two chips with a 5 Mb external DRAM either encode the CCIR601 digital component video signal into the standard-definition digital VCR (DV) format or decode the DV format signal into a component video signal. The compression rate of the intraframe compression is about 1/6. The total power dissipation of the two LSI's is 142 mW at 2 V internal supply voltage, which is more than one order of magnitude smaller than the recently reported MPIEG2 (MP@ML) encoder systems. Low power was achieved primarily due to the compression scheme which is optimized for large-scale integration (LSI) implementation. The 0.5-μm 2-V CMOS standard cell library was also effective in reducing the power consumption. Each chip, fabricated in two-layer metal 0.5-μm CMOS technology, contains about 500 k transistors on 71 mm² and 79 mm² die, respectively     

采用光纤光栅编/解码器的FFH-OCDMA实验系统

着重介绍了采用光纤光栅编／解码器的FFH—OCDMA实验系统的设计以及整个系统的结构，简要分析了系统的多用户干扰和地址码选择等，最后通过实验平台，验证了光纤光栅编／解码器和整个系统的性能。     

可变址光CDMA编解码器的设计与实现

本文提出了一种可灵活变址的编解码方案,并用设计的编,解码器进行了系统实验,结果表明这种编,解码器具有变址灵尖,性能可靠,实现方便等特点。