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USB接口数据采集卡
- 这个接口卡程序负责采集低频音频信号,USB控制芯片采用AN2131QC。软件包括3个模块:Keil51编写芯片固件程序,vc++编写USB驱动程序和用户程序-the interface card collection procedures for low-frequency audio signals, control chips using USB Peripheral. The software includes three modules : the preparation Keil51
USB2.0频谱分析仪
- USB2.0频谱分析仪是一种高分辨率的动态信号谱分析系统,既可用于中低频低通信号的分析和处理(最高频率不超过20MHZ),也可用于频率很高的带通信号的分析和处理。-USB2.0 spectrum analyzer is a high-resolution dynamic signal spectrum analysis system, which can be used in low frequency communication, analysis and processing (not mo
lowl-latency
- For USB program, low pass filter for audio,Audio low-frequency Pass filter.-For USB program, low pass filter for audio, Audio low-frequency Pass filter.
hitag2
- Low frequency NXP hitag2 encryption cipher This the low frequency NXP hitag2 encryption cipher. The package hitag2.zip contains the following files: hitag2.png - Cipher overview hitag2.c - Source-code
DSP1.zip
- 1)生成2KHz和8KHz的混合信号,使该信号通过上述滤波器,观察滤波前后的波形变化和频谱分布情况。 2) 在改信号中加入高斯白噪声,观察滤波前后的波形变化和频谱分布情况3) 将上述滤波器改为中心频率为100KHz的带通滤波器,信号源为带外的90KHz和带内的100KHz的混合正弦信号,。 4) 用M文件实现上述低通滤波器。 ,1) 2KHz and 8KHz to generate the mixed-signal, so that the signal through the abov
The-PKE-system-based-on-RFID-
- 以射频识别技术为基础,研究智能化的门禁系统在汽车领域的应用,该文设计的PKE系统在通讯上采用高频和低 频相结合的方法,实现了PKE系统功能和成本的最优化。文中还给出了PKE系统的工作原理图、系统框图及软件程序流程 图。 关键词:RFID;PKE;RKE;高频;低频- access control system of intelligent applications in the automotive sector, the paper PKE system in communicat
fir
- 用各种窗函数设计FIR数字滤波器。 分别用矩形窗和Hamming窗设计线性相位FIR低通滤波器。要求通带截止频率,单位脉冲响应h(n)的长度N=21,绘出h(n)及其幅频响应特性曲线。 -Window function with a variety of FIR digital filter design. Were rectangular window and Hamming window design of linear phase FIR low-pass filter. Req
aliasingfilter
- 1)设计Butterworth型音频抗混叠滤波器; 2)参数: 下通带频率300Hz;上通带频率3400Hz; 下阻带频率280Hz;上阻带频率3600Hz; 通带最大衰减0.3dB; 阻带最小衰减40dB; 3)采用一低通滤波器和一高通滤波器级联; 4)分别确定LPF和HPF的性能指标; 5)求出两滤波器的系统函数和频率响应,并画出其幅频特性曲线; 6)求整个滤波器的系统函数和频率响应,并画出其幅频特性曲线。-1) the design of Butterw
schumann_resonance
- The Schumann resonance frequencies are a set of eigenmodes in the extremely low frequency (ELF) portion of the electromagnetic field spectrum. These frequencies are only present for planetary-like bodies with a substantial ionosphere acting as a perf
digitalfilter_in_C_language
- We have to design a second order Butterworth filter having a sampling frequency of 20 kHz and -3db cut of frequency at 2 kHz in visual C. Only low frequency signals can pass through this filter and the signals having the frequency higher than frequen
dipinhuanxingjizhi
- RFID系统有源标签为降低功耗而采取的的低频唤醒机制。-RFID active tag system to reduce power consumption and wake-up mechanism for the low-frequency taken.
Magnetic
- 磁珠专用于抑制信号线、电源线上的高频噪声和尖峰干扰,还具有吸收静电脉冲的能力。磁珠是用来吸收超高频信号,像一些RF电路,PLL,振荡电路,含超高频存储器电路(DDR SDRAM,RAMBUS等)都需要在电源输入部分加磁珠,而电感是一种蓄能元件,用在LC振荡电路,中低频的滤波电路等,其应用频率范围很少超过50MHZ。-Inhibition of signal lines dedicated to beads, the power line frequency noise and interfere
frequency
- 实现分频,低通1khz 中1到5khz,高5到20khz-Achieve frequency, low-pass 1khz in 1 to 5khz, high 5 to 20khz
ofdm1
- 由MATLAB程序产生2Gbi/s的基带OFDM信号先将2^15-1个伪随机序列映射到256个进行4QAM编码调制的子载波上,编码后的OFDM符号再经过IFFT变换将其转换为时域波形,接着添加6.4ns的循环前缀(CP),产生的数据波形再装载到Tektronix任意波形发生器(AWG)中,产生2Gbit/s的基带OFDM信号。基带OFDM信号频谱示意图如图3所示。其中包括256个OFDM子载波256个子载波中200个子信道用来传送数据信号,27个高频和28个低频子信道为了过采样的需要置0,OFD
filter
- 对高斯噪声进行低通滤波,对比前后结果,观察滤波器的平滑作用-Gaussion noise low frequency filter
Document-of--lf-rfid-reader
- 适用于开发低频rfid读写器,门禁系统,动物管理系统。-Applicable to the development of low-frequency rfid reader, access control systems, animal management system.
test4
- 低频信号的2ASK调制解调,信道是理想信道-The low frequency the signal 2ASK modem, the channel is an ideal channel
原理图
- 奥地利微电子公司推出全新的 通道 、 低功耗 、 低频唤 醒接收器 ( ! , 能以 目前业界最低功耗提供极佳的灵敏 度 , 扩展 了旗下射频产品系列(125K low frequency receiver)
125kHZ_Reader
- 对125KHZ低频卡读ID号,如T5557卡(Read ID number for 125KHZ low frequency card)
PCB-Spiral-inductors-calculation
- pcb螺旋电感及线圈电感的计算,在低频RFID线圈天线中有着广泛的应用,经典频率125khz,13.56Mhz(pcb spiral inductors and coil inductance calculation of a wide range of applications in the low-frequency RFID coil antenna, the classical frequency 125khz, 13.56Mhz)