国际整流器公司全新MOSFET芯片延长笔记本电脑电池寿命20%

国际整流器公司(International Rectifier)推出适用于笔记本电脑的电源芯片,将笔记本电脑的电池寿命延长20%,是业内首个超越英特尔移动电源'99标准(Mobile Power Guideline 1999)的产品,该标准是英特公司特别为笔记本电脑的电源系统制定的。 新的低压HEXFET功率MOSFET产品有两种型号——IRF7805及IRF7807。这两个新产品的推出是基于对直流/直流转换器深入分析而提出的对栅电荷和通态电阻     

名厂风范 MOTOROKR EQ7蓝牙音箱

MOTO EQ7是摩托罗拉与音响大厂JBL合作推出的桌面型蓝牙音箱,强调音质和便携性能。EQ7为比较少见的飞碟造型。采用最常见的3.5mm音源输入孔,可以为它接上iPod、电脑、笔记本电脑或是手机来播放音乐,应用空间很宽广。EQ7底部有电池槽,使用两节AA电池即可     

Blind equalization of underwater acoustic channelusing a combined constant modulus algorithm

A kind of Combined Constant Modulus Algorithm (CCMA) is presented to compensate the defects of the Constant Modulus Algorithm (CMA) and the Sign Error CMA (SECMA). And CCMA is applied to the equalization of the underwater acoustic channel (UWAC). Based on the decision of the equalizer‘s output, its iteration process switches between CMA and SECMA automatically. It is more robust than SECMA, and more computationally efficient than CMA. Therefore, it is very suitable for the recovery of the underwater data transmission. The performance of CCMA is proven by computer simulation for the equalization of the UWAC.     

七星华创电池设备新产品硕果累累

北京七星华创电子股份有限公司从1997年小批量进入二次电池（可充电电池）生产制造设备领域以来，始终保持国内技术领先，市场份额逐年扩大。近五年内，七星华创二次电池设备销售额平均每年增长在100％以上，已经成为国内最大、品种系列最全、配套能力最强的二次电池专用设备制造商。七星华创根据市场发展需要，加大开发力度，又开发出新型双辊轧膜机和卷绕机系列产品。     

火眼金睛

看了上一期对真假电池方面的区分，作为消费者的你是不是在购买数码相机时更有底气了？这期．阿土将继续为大家揭露真假电池的区别。另外．在本期介绍的电池中有一些是今年新上市机型所用的电池假电池仿制速度之快让阿土感到有些措手不及。     

PERFORMANCE OF THREE STAGE TURBO－EQUALIZATION－DECODING

An increasing demand for high data rate transmission and protection over bandlimited channels with severe inter-symbol interference has resulted in a flurry of activity to improve channel equalization. In conjunction with equalization, channel coding-decoding can be employed to improve system performance. In this letter, the performance of the three stageturbo-equalization-decoding employing log maximum a posteriori probability is experimentally evaluated by a fading simulator. The BER is evaluated using various information sequence and interleaver sizes taking into account that the communication medium is a noisy inter symbol interference channel.     

双向HFC网上行传输的技术问题及其对策

利用HFC网络开展交互式业务时，在回传通道上存在回传噪声，分析了回传噪声的种类、特征及噪声的形成原因、侵入途径等，提出了为解决回传噪声的问题所采取的方法和措施，以确保在双向网络上顺利实现交互式业务。