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[Software Engineering] 66KeyLock DL : 0: 此题目是通过键盘来实现密码输入是否正确，正确的时候数码管亮，否则发出报警声。判断是按键还是干扰是非常有用的，它体现了一个系统的抗干扰能力。高低电平在瞬间的变换是很正常的，如果没有这条语句，系统很容易出错。其中2秒是由定时器0来完成的。在程序的定时器中断中，用switch代替了if else结构，使得程序的可读性大大增强。 TH0 = (65536-50000) / 256 TL0 = (65536-50000) 256 使得TH0 = 3CH, TL0 = B0H,由于该单片机的晶振为12MHz 因此定时时间就为0.05ms.在定时器中断服务程序中用FLASH计数，当计数达到40时正好是2秒。-This topic is through the keyboard to realize the correct password is correct, when GuanLiang digital alarm sound, otherwise. Judgment is a key or interference is very useful, it reflects the anti-interference ability of a system. High level in the instant transformation is very normal, if not this statement, the system is very easy to make a mistake. 2 seconds is accomplished by the timer 0. In the process of the timer interrupt, switch with replaced if else structure, make the readability of the procedures enhanced greatly. TH0 = (65536-50000)/256, TL0 = (65536-50000) 256, Make TH0 3CH, TL0 = = B0H, because the MCU crystals for 12MHz, So regularly time is 0.05 ms in timer interrupt service routines, when using FLASH counting 40 count when exactly 2 seconds.
Date : 2026-01-16 Size : 54kb User : 辛文乐
[Software Engineering] tvapm DL : 0: 水声通信面临的最困难的问题是多途干扰,其中自多途引起接收信号的幅度衰落,互多途引起接收信号的码间干扰,再加上海洋环境的高噪声背景、低的载波频率、极为有限的带宽以及传输条件的时间—空间—频率变化特性,使得通信过程十分困难。此外，水声通信试验的成本高，难度大，也为水声通信研究带来挑战。本软件对水声信道的仿真研究很有帮助，可以产生声线图，冲激响应，声速图等仿真文件，结合Matlab画图工具绘制图像，对水声信道的模拟仿真很有帮助。-The most difficult problem faced by underwater acoustic communication is multi-path interference, which since multipath fading caused by the magnitude of the received signal, and mutual inter-symbol interference caused by multipath signal reception, plus the marine environment of high background noise, low carrier frequency , very limited bandwidth and transmission conditions of time- space- frequency characteristic such that the communication process is very difficult. In addition, the high cost of underwater acoustic communication experiment, difficult, and challenges for the study of underwater acoustic communication. This software is useful for simulation study of underwater acoustic channel can produce sound chart, impulse response, sound velocity diagrams simulation files, combined with Matlab drawing tools to draw the image of underwater acoustic channel simulation helpful.
Date : 2026-01-16 Size : 406kb User : 苏羽