飞机舱音记录器声信息识别方法的初步研究

有效识别舱音记录器声信息对失事飞机原因调查十分重要.文章介绍了飞机舱音记录器、舱音记录器声信息及特点.指出了当前国内基于计算机音频处理技术的舱音记录器声信息译码系统在对声信息辨听方法上存在的不足.系统提出了运用MATLAB语言和小波变换对舱音记录器所记录的声信息（噪声、语音信息和其它背景声信息）识别方法.     

条形码技术在医技计费中的应用

本文介绍了条形码的含义，识别原理等，并具体阐述了条形码技术在医技计费中实践中的具体应用。     

条形码识别系统在商品入库工序中的应用

介绍一种条形码识别剔除系统。本系统利用条形码扫描器采集烟箱条形码信息，当出现烟箱条形码存在不合格码、重码或无码现象时，利用剔除装置将问题烟箱剔除。可有效避免条形码错码或无码的成品烟箱进入仓库，影响产品正常流入市场。经过在安阳卷烟厂近两年的应用运行中，杜绝了产品入库过程中可能出现的条形码不合格码、重码或无码等现象的发生。     

基于DM642的光笔式坐标测量机无线智能相机设计

为实现光笔式坐标测量机的智能化、高精度、实时性和灵活性,设计了一款基于美光科技的CMOS图像传感器MT9M001、TI公司多媒体处理芯片TMS320DM642及Ahera公司的CPLD的智能相机。该相机集图像采集、图像处理算法于一体,代替一般工业相机只能采集图像的单一功能。详细介绍了智能相机的硬件设计方案及其在光笔式坐标测量机中的应用原理。     

条码技术与成组技术结合应用于计算机辅助估价和工艺设计

本文介绍了用条形码检索方法，对电站配件自动进行估价和生产工艺卡的一种计算机软件系统。该系统依据电力行业标准《电站设备备品配件分类与编码导则》，对电站配件自动分类编码，并实现字符码与条形码的自动转换，只需扫描条形码，即可对相应配件作出估价，并生成其工艺过程卡。     

基于AVR单片机的LED点阵书写显示屏的设计

点阵书写显示屏的设计实现通过书写笔可以轻松、简便地输入信息并显示的装置,以单片机为微控制器,以32×32点阵LED组成显示模块.所设计的LED显示屏无需数据传输通信,以光笔书写方式输入信息,不需要触控器件,能够实现书写显示的功能.     

条形码技术与成组技术结合的可行性

本文介绍了条形码技术及其发展概况。探讨了条形码技术与成组技术结合的有关问题。     

条形码技术在电能表资产管理及计量管理信息系统中的应用

主要介绍条形码技术在电能表资产管理及计量管理信息系统中的具体应用和实现,体现新技术与现代管理思想的有机结合,论述条形码技术的优越性。     

稀土磁钢在笔式记录器中的应用

在超低频领域内,为了自动记录压力、流量、张力、温度、应力、转矩及生物电等物理量,记录仪器是必不可少的,而记录器则是记录仪中描绘曲线的执行元件。本文探讨了稀土磁钢应用于笔式记录器并使之小型化的途径,还成功地制造出性能好、体积小、加工维修很方便的内磁式记录器。由于稀土磁钢的矫顽力大、磁能积高,当减小内磁体直径及适当增大工作气隙的时候,气隙的磁感应强度不致明显的下降,因而为制造小型化记录器提供了有利条件。记录器与放大器匹配后,采用角速度负反馈及其它补偿方法,改善了频响指标,可高达100Hz。     

典型数字电影系统简介

本文简要介绍了柯达公司Cineon数字电影系统的电影胶片扫描器和激光记录器。     

A Microcomputer-Based System for Area Measurement

An electronic system developed for area measurement is described. A standard X-Y recorder specially adopted with a light pen was made to scan the area under test and give a TTL logic signal that changes state whenever the area circumference is crossed. From such information the microcomputer is programmed to calculate the area using Simpson's rule and display the result on a seven-segment display. Sources of error in measurement and its nature are investigated. Modifications in the basic system to reduce the error are included. The designed system can also be used for determining the perimeter and locating the centroid of an object.     

Application of the Piezoelectric Capillary Injector in Analog Recording

A piezoelectric capillary injector is considered. It has been used instead of the pen in an analog recorder. The advantage with this method is that the amount of ink can be modulated and the line width becomes independent of pen and paper speeds. For this purpose the frequency of the electric pulses to the injector has been modulated by the pen and paper speeds and the results are compared with the results of constant frequency. It has also been shown how the injector can be used to print some digital values at the same time that the curve is drawn.     

Microprocessor-Controlled Optical Stimulator for Vision Experiments

An optical stimulator designed for vision research experiments is described. The stimuli sequences of light are given in matrix form and can be permuted at will to result in a highly versatile instrument. Background and stimuli lights are derived from a common source to minimize cost and errors from the light source instability. The stimulator is built around two 8080 microprocessors controlling 12 stepping motors, a seven track FM recorder, three optical shutters, and a video monitor for command and control purposes.     

Digital speckle techniques for measuring light deflection profiles of inhomogeneous phase objects

Digital speckle pattern photography is applied to the measurement of light deflection profiles of inhomogeneous transparent objects by transmission of a He-Ne laser speckle field through the object. The speckles are recorded with a CCD camera, and the local displacements are evaluated by comparison of the deflected speckle field with the undeflected field by a digital cross-correlation technique. In this way a complete two-dimensional deflection field can be obtained from a single pair of CCD records. The basic technique and two experimental setups suitable for objects with a size larger than that of the CCD chip are described. These novel techniques are applied to determine profiles of the refractive index of a free-burning arc in air. In addition, a cinematographic setup is described, which allows the investigation of transient objects by means of a video tape recorder.     

高透明度β-甲壳素纳米纤维薄膜的制备与性能

目的以废弃鱿鱼顶骨为原料,在温和条件下提取并制备高强度、高透明度的β-甲壳素纳米纤维薄膜。方法常温下利用温和提取法,从鱿鱼顶骨中提取β-甲壳素纳米纤维(β-ChNF);通过真空抽滤,制备β-甲壳素纳米纤维薄膜(β-ChNF/m)。并与以蟹壳为原料“高温提取”制备所得的α-甲壳素纳米纤维薄膜(α-ChNF/m)进行对比;通过力学性能、结晶结构、微观构造、表面化学特性及透光性分析,探索“温和条件”提取法对薄膜性能的影响规律。结果利用温和提取法,能最大程度保留β-ChNF在鱿鱼顶骨中的天然纳米形态与性能;与从蟹壳中提取所得α-甲壳素相比,研究制备所得β-ChNF/m比α-ChNF/m力学强度提高了近1.5倍,断裂伸长率提高了3倍,且具备优异的透光性,透光率为90%,雾度为4%。结论以鱿鱼顶骨为原料制备所得β-ChNF/m具有优异的透光性、力学性能,有望作为柔性电子标签基材应用于智慧包装、包装智能检测等研究领域。     

A high data rate recorder for astronomy

A magnetic tape recorder developed for the special requirements of radio astronomy and geodesy is described. These requirements include a high bit packing density and long record times. The current version of this longitudinal recorder used by the Very Long Baseline Array (VLBA) records 5.5 Terabits on a 14-in diameter reel of inch-wide tape. A maximum record rate of 256 Mb/s is achieved in the VLBA configuration with one recorder operating at 4 ms and utilizing 32 of the heads in a single stack. The VLBA recorders have been tested using a longitudinal density of 2.25 fr/μm (57.15 kfrpi); 448 data +56 system tracks are recorded in 14 passes, each lasting 50 min, for a total record time (at 128 Mb/s) of 12 h on 14-in diameter reel of inch-wide 13-μ-thick D1-equivalent tape     

Statistical and fuzzy models of ambulatory systolic blood pressurefor hypertension diagnosis

A solution to reduce Ambulatory Systolic Blood Pressure (ASBP) variability during the analysis of a 24-h profile is studied and presented in this article. It consists of equipping the portable ASBP recorder device with other sensors, a three-axes accelerometer and a heart rate recorder, so as to enable an analysis of the tensional profile in the light of these concomitant data. A database has been collected, and two models linking ASBP variations with body acceleration and heart rate measurements are developed: a regression one, based on a priori knowledge of ASBP variations, and a fuzzy one, automatically built from experimental data. Their performances are tested in prediction and compared. Then, the results are compared to those obtained with one of the solutions currently used by the physicians to deal with ASBP variability. The results obtained on 16 young subjects from the database are significantly improved and thus, encouraging     

Design Considerations for a Microprocessor-Based Tape Transport System

The use of a microprocessor to control an instrumentation tape recorder is discussed. New features including simplified calibration, automatic calibration verification, identification of data channels, enhanced shuttle operating modes, and selective track recording increase versatility and ease of operation. New possibilities of remote control via the IEEE-48-1975 bus or the RS232C/RS449 interface are also described.