Description: 三点式振荡器是指LC回路的三个端点与晶体管的三个电极分别连接而成的电路，如图4-1（a）所示。图中三个电抗元件X1、X2、X3构成了决定振荡频率的并联谐振回路，同时也构成了正反馈所需的反馈网络。从相位条件看，要构成振荡器，必须满足： (1)极相连的两个电抗X1、X2性质相同。 (2)X1与X2、X3的电抗性质相反。-three-point refers to LC oscillator circuit with three transistors endpoint of three electrodes were connected with the circuit, Figure 4-1 (a) below. Figure 3 reactor components X1, X2, X3 decision constitutes a frequency of the oscillation parallel resonant circuit, but also constitutes a positive feedback for the feedback network. From Phase conditions, to constitute an oscillator, to be met : (a) very connected to the two reactor X1, X2 the same nature. (2) X1 and X2, X3 nature of the resistance -- contrary. Platform: |
Size: 16081 |
Author:张枫 |
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Description: JTAG CPLD实现源代码，比用简单并口调试器快5倍以上。
以前总觉得简单的并口jtag板速度太慢，特别是调试bootloader的时候，简直难以忍受。最近没什么事情，于是补习了几天vhdl，用cpld实现了一个快速的jtag转换板。cpld用epm7128stc100-15，晶振20兆，tck频率5兆。用sjf2410作测试，以前写50k的文件用时5分钟，现在则是50秒左右。tck的频率还可以加倍，但是不太稳定，而且速度的瓶颈已经不在tck这里，而在通讯上面了。
-JTAG CPLD source code than the simple parallel debugger five times faster. Before feel simple parallel port JTAG board is too slow, especially when debugging Bootloader, simply intolerable. No matter recently, so VHDL tutorial for a few days, with cpld to achieve a rapid conversion of JTAG board. Cpld with epm7128stc100-15, 20 Katherine crystal, the frequency tck 5 trillion. Sjf2410 used for testing, before the document was made with 50k at 5 minutes, now it is about 50 seconds. Tck frequencies can also doubled, but not too stable, but the rate has not tck bottleneck here, and in the above communications. Platform: |
Size: 2023 |
Author:李伟 |
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Description: 利用频域并行的方法对GPS的C码捕获的方法进行了仿真。直接解压就可以了。-frequency domain using the method of parallel GPS C code acquisition of the simulation methods. Decompression directly on it. Platform: |
Size: 1024 |
Author:李成军 |
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Description: M-file for simulating a QPSK transmitter by modulating with a pseudo random bit stream. A serial to parallel conversion of the pseudo random bit stream is performed with mapping of two bits per symbol. A cosine and sine carrier is configured and the I and Q symbols modulate these carriers. The I and Q carriers are combined and time and frequency domain plots are provided showing key waveforms at various positions in the QPSK transmitter.
-M-file for simulating a QPSK transmitter b y modulating with a pseudo random bit stream. A s erial to parallel conversion of the pseudo rand om bit stream is performed with mapping of two bi ts per symbol. A cosine and sine carrier is CBMs gured and the I and Q symbols Modulate these CARR IERS. The I and Q carriers are combined and a time nd frequency domain plots are provided showing key waveforms at various positions in the QPSK t ransmitter. Platform: |
Size: 2048 |
Author:xiaoying |
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Description: A self-designed control of PC parallel port communication is introduced in this paper.Taking advantage of the MFC ActiveX technology, it is developed in Visual C++ and offset the scarcity of the control of PC parellel paort communication. An example of frequency measurement shows the detail procedure and application of the control. Platform: |
Size: 152576 |
Author:chengxin |
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Description: 该模块主要完成并串转换功能。其中system_clk是输入并行时钟的频率，它是串行时钟serial_clk的八倍。byte_data_en是输入并行数据使能信号，byte_data是输入并行数据。serial_data是转换后的串行数据，bit_data_enable是串行数据有效信号。-The module main is completed and the string conversion functions. System_clk which is an input parallel clock frequency, it is the serial clock serial_clk eight times. byte_data_en is a parallel data input enable signal, byte_data is a parallel data input. serial_data is converted serial data, bit_data_enable is the serial data signal. Platform: |
Size: 1024 |
Author:huangdecheng |
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Description:
正交频分复用是一种多载波宽带数字调制技术。相比一般的数字通信系统，
它具有频带利用率高和抗多径干扰能力强等优点，因而适合于高速率的无线通信系统。-
OFDM Simulator
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MIMO OFDM Simulator:
OFDM.m: OFDM Simulator (outer function)
create_channel.m: Generates a Rayleigh fading frequency-selective channel, parametrized by the antenna configuration, the OFDM configuration, and the power-delay profile.
svd_decompose_channel.m: Since full channel knowledge is assumed, transmission is across parallel singular value modes. This function decomposes the channel into these modes.
BitLoad.m: Apply the bit-loading algorithm to achieve the desired bit and energy allocation for the current channel instance.
ComputeSNR.m: Given the subcarrier gains, this simple function generates the SNR values of each channel (each singular value on each tone is a separate channel).
chow_algo.m: Apply Chow s algorithm to generate a particular bit and energy allocation.
EnergyTableInit.m: Given the SNR values, form a table of energy increments for Platform: |
Size: 184320 |
Author:田静 |
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Description: 并/串转换器即并行输入、串行输出转换器，例如一个8bit输入的并/串转换器，输出时钟频率是输入时钟频率的8倍，输入端一个时钟到来，8个输入端口同时输入数据；输出端以8倍的速度将并行输入的8bit串行输出，至于从高位输出还是从低位输出，可以再程序中指定。-And/or parallel series converter input, serial output converter, for example, a 8bit input and/series converter, the output clock frequency is the input clock frequency of 8 times, the arrival of a clock input, 8 input data input port at the same time output to 8 times the speed of 8bit parallel input serial output, as output from a high level or low output, the procedure can be specified. Platform: |
Size: 1024 |
Author:赵军 |
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Description: In this project we have processed the speech signal with the help of the DIGITAL SIGNAL PROCESSING techniques. The speech signal is given as the input will be verified using speech recognition technique using matlab. We have used Mel Frequency Cepstral Coefficient (MFCC) along with Vector Quantization (VQLBG) and Euclidean Distance to identify different characters. Based on the results, data was send to Parallel Printer Port of the computer & using relay different devices will be controlled.
Platform: |
Size: 2048 |
Author:SimonKap22 |
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Description: The purpose of this lecture is to show the idea behind GPS signal acquisition and
additionally different ways of doing the implementation.
Subjects
- GPS Signal Acquisition
o Doppler frequency bins
- Serial Search Acquisition
- Parallel Frequency Space Search Acquisition
- Parallel Code Space Search Acquisition -The purpose of this lecture is to show the idea behind GPS signal acquisition and
additionally different ways of doing the implementation.
Subjects
- GPS Signal Acquisition
o Doppler frequency bins
- Serial Search Acquisition
- Parallel Frequency Space Search Acquisition
- Parallel Code Space Search Acquisition Platform: |
Size: 4244480 |
Author:曲卫 |
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Description: This examples corresponds to a 2x2 system with parallel linear arrays, where the mobile moves aways from the base station,
with a constant speed such that the Maximum Doppler frequency is 5 Hz. The element spacings at the base station and mobile are one lambda and 0.5 lambda, respectively. The maximum angle spread at the base station is 4 degrees, whereas isotropic scattering is assumed around the mobile. The length of the simulated MIMO channel is 5 seconds, and any two adjacent samples are spaced by 0.01 seconds. For ensemble averaging, 90 realizations of the MIMO channel are generated.-This examples corresponds to a 2x2 system with parallel linear arrays, where the mobile moves aways from the base station, with a constant speed such that the Maximum Doppler frequency is 5 Hz. The element spacings at the base station and mobile are one lambda and 0.5 lambda, respectively. The maximum angle spread at the base station is 4 degrees, whereas isotropic scattering is assumed around the mobile. The length of the simulated MIMO channel is 5 seconds, and any two adjacent samples are spaced by 0.01 seconds. For ensemble averaging , 90 realizations of the MIMO channel are generated. Platform: |
Size: 690176 |
Author:jerry |
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Description: AD9851(DDS) 驱动：使用的是stc52单片机驱动。驱动模式为并行驱动。可以控制频率、相位等-AD9851 (DDS) drive: use is stc52 single-chip driver. The drive mode is driven in parallel. You can control the frequency, phase, and so on ... Platform: |
Size: 27648 |
Author:zj |
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Description: 此为AD9850芯片的并行控制程序，此程序可以产生单频信号，输出能够达到40MHZ，具体视电路状态决定-This is the the AD9850 chip parallel control program, this program can generate a single-frequency signal, the output can be achieved 40MHZ, depending on the state of the circuit decision Platform: |
Size: 20480 |
Author:郑浩东 |
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Description: 基于90s2313的计算机并口频率计，有图纸和源代码-Parallel computers based 90s2313 frequency meter, there are drawings and source code Platform: |
Size: 2201600 |
Author:hongfeng |
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Description: PARALLEL-BEAM TOMOGRAPHIC IMAGE RECONSTRUCTION
This projects reproduces results of procedures regarding CT Image Reconstruction. The application will applied to computed tomography single photon emission (SPECT) data . In particular, the following steps-commands are used : reading / presenting two-dimensional sectional image data using function normalization volume [0,1] output intersection projections (imitonogramma - transformation radon 360 angles) using linear (linear) interpolation , projection filter (filter setting a cut-off frequency of the filter 90 of the maximum frequency), and the end use of iradon function for reconstruction. The results in the reconstructed images are compared on the basis of specific data line (improfile)-PARALLEL-BEAM TOMOGRAPHIC IMAGE RECONSTRUCTION
This projects reproduces results of procedures regarding CT Image Reconstruction. The application will applied to computed tomography single photon emission (SPECT) data . In particular, the following steps-commands are used : reading / presenting two-dimensional sectional image data using function normalization volume [0,1] output intersection projections (imitonogramma - transformation radon 360 angles) using linear (linear) interpolation , projection filter (filter setting a cut-off frequency of the filter 90 of the maximum frequency), and the end use of iradon function for reconstruction. The results in the reconstructed images are compared on the basis of specific data line (improfile) Platform: |
Size: 404480 |
Author:staNou |
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Description: 程序中详尽的给出了串行捕获、并行码相位捕获 、并行频率捕获、生成指定卫星的伪随机码、热噪声功率谱、混频器示意图、滤波器演示等应用于卫星接收机的基础编程，(In the program, the basic programming of serial acquisition, parallel code phase capture, parallel frequency capture, pseudorandom code of generating designated satellite, thermal noise power spectrum, mixer diagram, filter demonstration and so on are given in detail.) Platform: |
Size: 6332416 |
Author:MATLAB小子 |
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Description: 该函数使用标准VAR估计值计算滚动溢出。
我们实现了并行版本，以提高处理速度。窗口为固定窗口，在数据上滚动。其他参数的解释与溢出的标准计算相同。
按照Barunik、Krehlik（2018）的定义计算fevd的滚动频率溢出}。(This function computes the rolling spillover using the standard VAR estimate.
We implement the parallel version for faster processing. The window is of fixed window
and is rolled over the data. Interpretation of the other parameters is the same as in the
standard computation of spillover.) Platform: |
Size: 1024 |
Author:皮球皮皮球 |
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Search - parallel frequency