IEC104规约模拟程序

应用背景AD9850 采用32 位的相位累加器将信号截断成14 位输入到正弦查询表，查询表的输出再被截断成10 位后输入到DAC，DAC 再输出两个互补的电流。DAC 满量程输出电流通过一个外接电阻setR调节，调节关系为setI=32(1.148V/RSET)，setR的典型值是3.9K。将DAC 的输出经低通滤波后接到AD9850 内部的高速  比较器上即可直接输出一个抖动很小的方波。关键技术本代码采用的是STM32和51控制AD9850波形发生器，正弦波产生过程为：频率设置，数据处理，然后控制DDS芯片完成各种频率的正弦波产生；调幅波产生过程为：通过调制系数的设置，控制D/A转换器输出，可得到不同幅值的调制波，与载波相乘来实现调幅波的产生；PSK、ASK产生：通过MCU对模拟开关的控制来完成PSK、ASK的产生。调频信号产生过程：通过A/D转换器采集调制信号，然后根据调制信号的幅度计算出频偏，把频偏数据下载到DDS即可实现调频信号的产生。

这是一个用VB做的成绩管理系统.请大家看看给点意见,那里需要改进的地方.-A grade management system designed in VB.Please read the code to improve it.

display user/system information

Extended C codes for door bell with melody and volume

23种涉及模式的C++实现，对新手或有相当能力的老手都有帮助-Involved in 23 kinds of model C++ Implementation of the novice or the veteran has a considerable capacity to help

Delphi编程控制摄像头-Delphi programming control camera

vc6.0助手，vc程序必备工具，小而实用。-vc6.0 assistant, vc procedures necessary tools, small and practical.

This test_tonegen example application consists of both DSP and VM software to implement a tone generator using the Kalimba DSP. The tones are controlled by AT-commands sent by an off-chip host. Note: No Bluetooth functionality is required or invoked in this example. A terminal emulator application e.g. Windows HyperTerminal can be used to send AT commands and receive the responses from the VM application running on the BlueCore. -This test_tonegen example application consists of both DSP and VM software to implement a tone generator using the Kalimba DSP. The tones are controlled by AT-commands sent by an off-chip host. Note: No Bluetooth functionality is required or invoked in this example. A terminal emulator application e.g. Windows HyperTerminal can be used to send AT commands and receive the responses from the VM application running on the BlueCore.

企业后台网站框架，运行速度还是可以的 有需要的就下载吧

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