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在电子技术中，频率是最基本的参数之一，又与许多电参量的测量方案、测量结果都有十分密切的关系，因此频率的测量就显得更为重要。测量频率的方法有多种,其中电子计数器测量频率具有精度高、使用方便、测量迅速，以及便于实现测量过程自动化等优点，是频率测量的重要手段之一。在本次毕业设计中我们选择使用单片机来制作数字频率计，并在实际制作中采用了直接测频法。利用延时产生的时基门控信号来控制闸门，通过在单位时间内计数器记录下的脉冲个数计算出输入信号的频率，最终送入LCD中显示。这样制作出来的频率计不仅可以满足设计题目的参数要求，而且具有了单片机的稳定性和成熟性，且控制能力强，是一种低成本，高可靠的设计方案。-In electronic technology, the frequency is one of the most basic parameters, but also with a number of electrical parameters of the measurement program, the measurement results have a very close relationship between the frequency of measurement, therefore it is even more important. Measurement of the frequency of a number of means, electronic measurement of the frequency counter with high precision, easy to use, rapid measurement, and measurement is easy to realize the advantages of process automation is an important means of measuring the frequency of one. Graduates in this design we have chosen to make use of single-chip digital frequency meter, and used in the actual production of a direct

心率指心脏每分钟搏动的次数, 它能够反映心脏的工作状态。正常心率决定于窦房结的节律性, 成人静息时约60～100 次/ min , 平均约75次/ min。心率可因年龄、性别及其他因素而变化。初生儿心率约130 次/ min , 随年龄增长而逐渐减慢, 至青春期乃接近成人的心率。女性心率比男性稍快 运动员心率较慢。成人安静心率超过120 次/ min 者, 为心动过速 低于40 次/ min 者为心动过缓。心率受植物性神经和体液因素调节。-Heart rate means the number of pulse per minute, it can reflect the work of the state of the heart. Normal heart rate determined by the rhythm of the sinoatrial node, resting adult is about 60 ~ 100 times/min, an average of about 75 times/min. Heart rate may be due to age, gender and other factors change. Heart rate of newborn infants of about 130/min, growth has gradually slowed down with age, to adolescence adult heart rate is near. Women slightly faster rate than men athletes slow heart rate. Quiet adult heart rate over 120 times/min, and for the tachycardia less than 40 times/min for bradycardia. Heart rate by the plant regulate neural and humoral factors.

GPS方案模块框图，如有兴趣可以参考框图设计GPS,很有参考价值-GPS module diagram of the program, who are interested can refer to diagram design GPS, a good reference

浅显易懂的kalman入门教程，绝对让你在1个小时之内明白其基本原理-Easy to understand the kalman Tutorial definitely let you in one hours of understand the basic principles of

Unix学习宝典 简体中文 书籍类型： 系统专区 授权方式： 免费软件 书籍大小： 398 KB -Unix book learning English books Type : System Precinct license : free software books Size : 398 KB

DVB Document A053 Extensions to the Common Interface Specification

AC Controller you can use it as a good reference

基于Linux上的DirectFB简介，提供的功能，支持的API，应用方案，市场分析等等。日文版-DirectFB on Linux-based introduction to the functions provided to support the API, applications, market analysis and so on. Japanese version

POS系统后台的设置方案范例，DOC文档。-POS systems installed background programs example, DOC files.

ETSI TS 101 699 Digital Video Broadcasting (DVB) Extensions to the Common Interface Specification-ETSI TS 101699 Digital Video Broadcasting (DVB) Extensions to the Common Interface Speci fication