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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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MCP2515_cn
stc 通信程序，STC12C5A60S2串口通信，包括串口1串口2
- 2011-05-25 08:13:21下载
- 积分：1
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jianpan
单片机键盘控制,可用外接键盘来向单片机输入数字(control of the keyboard)
- 2011-12-21 19:26:13下载
- 积分：1
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include
说明： RSDK 1.3.6 includes for integration in custom projects
- 2020-09-22 18:00:22下载
- 积分：1
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timer4_led_test
ARM Cortex-A8 裸板，定时器4 和定时器0的测试程序(ARM Cortex-A8 bare boards, Timer 4 and Timer 0 testing procedures)
- 2013-12-06 22:06:10下载
- 积分：1
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I2C_Slave
MSP430F5438 I2C 从机模式代码(MSP430F5438 I2C Slave mode code)
- 2013-09-02 16:20:20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
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51单片机音乐播放文件
说明： 51单片机蜂鸣器音乐播放器的头文件，可自己更改旋律(51 MCU buzzer music player header file, you can change the melody)
- 2019-05-10 17:46:17下载
- 积分：1
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LS
说明： little projects in lab view so i can just have access to downloads
- 2014-01-19 19:45:40下载
- 积分：1
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ISAR_IMAGING_ROTATETARGET
该程序对4个点目标进行仿真成像，距离向采用解线频调方法进行压缩，方位向采用传统的脉冲压缩，最后获得了4个点目标的像。程序中给出了详细的参数设置，便于理解。(The program on a four point target simulation imaging, distance to the solution line frequency modulation, compression, orientation to the traditional pulse compression, and finally a four point targets like. The program gives a detailed parameter settings, easy to understand.)
- 2012-07-10 16:46:05下载
- 积分：1
