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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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mu
奇迹自动捡物按键精灵源码
可自动挂机，捡物文本源码(Miracle Source Wizard button automatically picking up objects)
- 2014-01-13 02:37:54下载
- 积分：1
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DALI-Unit
DALI调光详细讲解，软硬件齐全，不可多得的好材料(DALI dimming elaborate hardware and software is complete, the rare good material)
- 2011-01-28 15:18:46下载
- 积分：1
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adc
对ad7685的详细运用。加上12864显示。有电路图、芯片资料(Detailed use of ad7685 plus 12864 shows)
- 2013-08-21 14:37:18下载
- 积分：1
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VC6.0
说明： Ic卡 cpu 卡 发卡源程序
Ic卡 cpu 卡 发卡源程序(ic card cpucard ic card cpucard)
- 2010-04-23 13:07:28下载
- 积分：1
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AD4351-PLL
锁相环芯片ADF4351的控制程序，调用非常方便(fan yi bu liao a。。。。。)
- 2015-12-03 17:22:45下载
- 积分：1
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GREE6_Y502
说明： 单片机I/O口控制红外发射管，模拟格力空调遥控器的代码。典型应用：上位机发送一个通用的“开机，温度，模式……”命令，单片机自动发射出和遥控器一摸一样的波形，实现智能遥控器的功能。 (MCU I/O port control infrared emission control, analog Gree air conditioner remote control code. Typical applications: host computer to send a generic " boot, temperature, mode ... ..." command, microcontroller and the remote control automatically emit the same wave first touch, intelligent remote control functions.)
- 2010-03-19 14:36:36下载
- 积分：1
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MCG
MC9S12DZ60时钟初始化程序, C语言, code warrior 软件(initial program of MCG, C language，code warrior software)
- 2012-01-02 18:01:07下载
- 积分：1
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search-for-max-light-power-point
驱动步进电机，旋转多次，寻找空间光强极大值初步程序(Drive stepper motor rotation several times to find space intensity maxima preliminary program)
- 2016-04-03 22:41:56下载
- 积分：1
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1602
说明： 用4*4矩阵键盘给液晶1602送四位数，其中第四行按键设置为功能键，按键显示可调对应位的数字(With 4* 4 matrix keyboard to send the four-digit LCD 1602, the fourth line of buttons is set to function keys, adjustable button displays the corresponding number of bits)
- 2009-08-29 13:21:16下载
- 积分：1
