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cheng
滤波器广泛应用于数字信号处理、通信、自动控制领域,但设计可变宽频带有源滤波器则比较困难。利用单片机控制参数可编程的双二阶通用开关电容有源滤波器,精确设置有源滤波器的中心频率f,品质因数Q及有源滤波器的工作方式。本系统主要分为两个部分:即程控滤波器和程控放大器。程控放大器电压增益为40dB,通过单片机控制DA进行分压,可精确实现要求的10dB步进,误差小于0.5 ,通带为100Hz-500KHz,输入电压峰-峰值范围为10mV,在输入范围内无明显失真。由MAX264为核心的滤波器,可设置为高通、低通滤波器。通过单片机直接给出控制频率,使-3dB截止频率在1KHz-20KHz内可调,步进1KHz,误差小于1 。整个系统以52单片机为控制核心,电路简单,性能稳定,且具有较高精度,滤波参数调节通过单片机控制,较为方便。(Filters are widely used in digital signal processing, communications, automatic control area, but the design variable wideband active filter is more difficult. Control parameters using single-chip programmable universal switched-capacitor biquad active filter, active filter accurately set the center frequency f, quality factor Q and the active filter works. The system is mainly divided into two parts: the program-controlled filters and programmable amplifiers. Programmable amplifier voltage gain of 40dB, the DA through the partial pressure of single-chip control, can accurately achieve the required 10dB step, the error is less than 0.5 , passband to 100Hz-500KHz, input voltage peak- the range of 10mV, the input range no significant distortion. By the MAX264 as the core of filter can be set to high pass, low pass filter. Given directly by the microcontroller controls the frequency, the-3dB cutoff frequency at 1KHz-20KHz adjustable, step 1KHz, error is less than 1 . The entire system for)
- 2011-07-17 16:23:27下载
- 积分:1
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VB-YKMUSB-sampling
说明: 使用vb与衡河9140示波器连接,并控制采集一列脉冲数据,对数据进行分析,计算脉宽、积分面积、平均电压,并将波形通过picture控件显示在界面上(Using vb oscilloscope connected with the value for r. 9140, and a pulse control and data acquisition data, analyze data, calculate pulse width, integration area, average voltage, and waveform display in the interface through the picture controls on)
- 2010-04-01 22:20:56下载
- 积分:1
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cdcemu
松下车载碟机的协议代码,用于多种汽车的原车配备机头的扩展协议(Panasonic Car turntables protocol code, the original car used in a variety of vehicles equipped with head of the extended protocol)
- 2016-02-15 23:06:20下载
- 积分:1
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Sample_AgilentVISA
基于VISA的,采用lan口通信的,安捷伦示波器读取数据的程序。(VISA-based, using the lan port communications, Agilent oscilloscope program to read the data.)
- 2016-01-12 18:48:53下载
- 积分:1
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Data-Acquisition-System
数据采集系统
MAX1403.C 该文件是用于MAX1403的代码,包含了McBSP初始化、MAX1403初始化、McBSP读写等函数,读者可加入自己的工程之中去,并根据自己的要求适量修改之。
TLC5510A.C 该文件是用来驱动TLC5510A的代码,由于TLC5510A是总线型的高速AD,其访问较为简单,访问的方法及细节请见本书第17章。
MAX5444.C 该文件是驱动MAX5444的代码,由于MAX5444是单路高精度DA,所以,代码中只需执行系统初始化、McBSP初始化之后即可对MAX5444进行写数据操作,从而输出电压值。
AD7541A.C 该文件是驱动AD7541A的代码,AD7541A是总线型的高速DA,其访问方式如同片外RAM一样,请参考本书第17章的介绍
pdf 文件是“数据采集系统”的电路图实例,本电路图注重于高速AD、高精度AD、高速DA、高精度DA的连接方法以及外围电路设计,为读者朋友提供一个完整的电路实例。而C6713电路部分,只涉及C6713与四个AD/DA器件的连接关系,至于C6713的其他部分(如SDRAM、FLASH等)都略去,读者可参考另外相关的章节。(Data Acquisition System)
- 2010-06-24 19:59:57下载
- 积分:1
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dljs
改程序适应于电力系统短路电流计算,生成节点导纳矩阵和阻抗矩阵。(Change program suitable for power system short-circuit current calculation, to generate the node admittance matrix and the impedance matrix.)
- 2014-09-27 21:37:47下载
- 积分:1
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ILI9342PHSD2.3
这个是9342的测试程序,已经调试OK,希望可以帮助有需要的朋友。(This is the 9225 test program has debugging OK, I hope to help a friend in need.)
- 2011-11-18 21:48:37下载
- 积分:1
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CH341A-Labview-driver-VI.lib
I2C与mens传感器通信应用ch341-I2C-labview(I2C and mens tongxin)
- 2015-07-23 11:29:21下载
- 积分:1
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Slide_1
关于一个滑块显示的程序,可以通过滑块调整实现各种功能(About a slider and its function)
- 2010-06-21 19:51:39下载
- 积分:1
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stm32_LD3320_SDcard_mp3
能从SD卡读取MP3文件,并且识别后通过LD3320播放MP3,具体使用只需新建一个.ini系统文件存在sd卡,在里面设置好关键词并且所需播放的MP3文件即可(Read MP3 files from the SD card through the LD3320 play MP3 and identify specific use simply create a new the ini system files sd card exists inside set keywords and required to play MP3 files can)
- 2013-03-15 00:30:34下载
- 积分:1