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[Post-TeleCom sofeware systems] mfsk

Description: vhdl mfsk 多进制数字频率调制(MFSK)也称多元调频或多频制。MFSK系统是 2FSK(二频键控)系统的推广，该系统有 M个 不同的载波频率可供选择．每一个载波频率对应一个 M进制码 元信息，即用多个频率不同的正弦波分别代表不同的数字信号，在某一码元时间内只发送其中一个频率。-vhdl mfsk M-ary digital frequency modulation (MFSK), also known as multi-frequency or multi-frequency system. MFSK system is 2FSK (b Frequency Shift Keying) system, the promotion, the system has M different carrier frequencies to choose from. Each carrier frequency corresponds to an M-band meta-information code, which uses a number of different sine wave frequency, respectively, representing different digital signal, in a symbol time to send only one frequency.
Platform: | Size: 1024 | Author: mzizai | Hits:

[SCM] dmc_verilog

Description: 本示例中使用了一个DCM模块，将输入时钟50MHz，倍频到100MHz，分频到25MHz，不同的频率值通过LED进行演示。-This example uses a DCM module, the input clock 50MHz, frequency-doubled to 100MHz, frequency to 25MHz, the frequency of different values demonstrated through the LED.
Platform: | Size: 631808 | Author: 沈天平 | Hits:

[VHDL-FPGA-Verilog] seg7_1

Description: 用VHDL描述一个让6个数码管同时显示的控制器，同时显示0、1、2、3、4、5这6个不同的数字图形到6个数码管上，输入时钟调节频率，使得能够观察到稳定显示的6个数字。可异步复位-Using VHDL description of a six digital tube display controller at the same time, also showed that six different 0,1,2,3,4,5 digital graphics to six digital tube, the input clock frequency adjustment, making it possible to observe the to the stability shown in figure 6. Can be asynchronous reset
Platform: | Size: 1024 | Author: wx | Hits:

[VHDL-FPGA-Verilog] VGA

Description: VGA彩色信号控制器设计：用VHDL语言编写程序，重点完成三个功能： 1.棋盘格图案显示： 用三基色原理在CRT显示器上显示由横竖八彩条重叠构成的棋盘格图案； 2.在显示器上依次显示0~9十个数字： 每个数字不同颜色，每个显示大约0.4秒，循环显示； 3.显示动画效果： 将静态图像以高频率显示，造成动画效果，最终动态显示OVER结束。-VGA color signal controller design: using VHDL programming language, focusing on the completion of three functions: 1. Chessboard grid pattern shows that: The principle of three-color display on the CRT display by eight color横竖overlapping grid consisting of checkerboard patterns 2. followed by the display on display 0 ~ 9 10 figure: Each figure in different colors, each show around 0.4 seconds, circular display 3. show animation effects: static image to display a high frequency, resulting in animation effects, dynamic display finally OVER The End .
Platform: | Size: 186368 | Author: 刘峰 | Hits:

[VHDL-FPGA-Verilog] fpga.fifo

Description: 异步FIFO是用来适配不同时钟域之间的相位差和频率飘移的重要模块。本文设计的异步FIFO采用了格雷（GRAY）变换技术和双端口RAM实现了不同时钟域之间的数据无损传输。该结构利用了GRAY变换的特点，使得整个系统可靠性高和抗干扰能力强，系统可以工作在读写时钟频率漂移达到正负300PPM的恶劣环境。并且由于采用了模块化结构，使得系统具有良好的可扩充性。-Asynchronous FIFO is an important module which always used to absorb the phase and frequency offset between different clock domain in communication area .In this paper, an FIFO module is designed using Gray convert technology and dual-port ram , which realizing scatheless transmit between different clock domain. The advances of Gray (Only one bit changes between neighboring two clock ) improves the reliability and anti-jamming capability of the system. And the system can work normally in the bad condition which the phase and frequency offset target to 300PPM. It is proved by work that the FIFO module can fulfill the demands of real-time of data transmitting system, and the module is powerful enough for more data process in the future.
Platform: | Size: 81920 | Author: 雷志 | Hits:

[Software Engineering] CRC

Description: 　本文提出一种通用的CRC 并行计算原理及实现方法,适于不同的CRC 生成多项式和不同并行度(如8 位、16 位、及32 位等) ,与目前已采用的查表法比较,不需要存放余数表的高速存储器,减少了时延,且可通过增加并 行度来降低高速数传系统的CRC 运算时钟频率.-In this paper, a universal principle of CRC and implementation of parallel computing methods for generating different CRC polynomial and different degree of parallelism (eg, 8, 16, and 32-bit, etc.), with the current look-up table method has been used in comparison do not store more than a few tables, high-speed memory, reducing latency, and degree of parallelism can be increased to reduce the high-speed data-transmission system clock frequency of the CRC computation.
Platform: | Size: 144384 | Author: 黑月 | Hits:

[VHDL-FPGA-Verilog] DDS

Description: DDS信号发生器，利用VHDL实现，可根据频率控制字的改变输出不同频率的信号，最高可到达10MBPS-DDS signal generator, the use of VHDL realization of frequency control word in accordance with changes in output signals of different frequencies, the maximum arrival 10MBPS
Platform: | Size: 784384 | Author: 陈宇 | Hits:

[VHDL-FPGA-Verilog] DDS_FINAL

Description: My project is on Direct Digital Synthesiser using Verilog HDL.This project is doing by me on july 2009 in summer training at NIT Kurukshetra, India. This DDS system generate the square wave, Triangular wave,Sine wave and saw wave with different frequency. We can change the frequency using frequency selector input. Please accept this project. We use the SPARTAN 3E 500 device to implement it.
Platform: | Size: 437248 | Author: Raju Kumar | Hits:

[Communication] 3FSK.vhd

Description: 利用MAXPLUS作为仿真工具，用VHDL语言编程，采用频率键控法实现3FSK调制。对输入的系统时钟分别进行2分频，4分频和8分频得到这3种频率。通过对数字基带信号进行双二进制编码得到3个电平值，把它们作为三选一开关，来分别选择不同的频率值、选择不同的信号，从而实现3FSK调制。-As a simulation tool used MAXPLUS using VHDL language programming, using frequency shift keying modulation method to achieve 3FSK. The input of the system clock frequency respectively 2 hours, 4 minutes and 8 frequency-divider to have these three kinds of frequencies. Through the digital baseband signals received three pairs of binary-coded level value, and use them as three elected a switch to a different frequency values were selected, select a different signal, in order to achieve 3FSK modulation.
Platform: | Size: 4096 | Author: 雷月 | Hits:

[File Format] renyiboxing

Description: 信号发生器是一种常用的仪器，能够实现各种波形，不同频率的输出，电子测试系统的重要部件。本研究 的数字信号发生器足基于直接数字合成即DDS技术设计的，采用VHDL与C语言相结合的方法，通过查找存储 于ROM查找表中的各种标准波形数据，产牛频率Hf调并且高精度的正弦波、方波、锯齿波等常用信号，并且町 以通过修改表中的数据，实现任意信号发生器-Signal generator is a commonly used instrument to achieve a variety of waveforms of different frequency output, a key component of electronic test systems. In this study, full digital signal generator that is based on DDS technology of direct digital synthesis design, VHDL and C language using the method of combining, by looking up stored in ROM look-up table in a variety of standard waveform data, the cattle and the high frequency tone Hf accuracy of the sine wave, square wave, sawtooth and other signals used, and town to modify table data, an arbitrary signal generator
Platform: | Size: 268288 | Author: 姚木 | Hits:

[VHDL-FPGA-Verilog] vhdl

Description: 实验箱的蜂鸣器是交流蜂鸣器，在BZSP输入一定频率的脉冲时，蜂鸣器蜂鸣，改变输入频率可以改变蜂鸣器的响声。因此可以利用一个PWM来控制BZSP，通过改变PWM的频率来得到不同的声响，以此来播放音乐。-Experiment Box AC buzzer buzzer is in BZSP certain frequency pulse input, the buzzer beeps to change the input frequency can change the sound of the buzzer. So you can use a PWM to control BZSP, by changing the PWM frequency to get different sounds in order to play music.
Platform: | Size: 22528 | Author: 王记存 | Hits:

[VHDL-FPGA-Verilog] cFFT

Description: CFFT is a radix-4 fast Fourier transform (FFT) core with configurable data width and a configurable number of sample points in the FFT. Twiddle factors are implemented using the CORDIC algorithm, causing the gain of the CFFT core to be different from the standard FFT algorithm. This variation in gain is not important for orthogonal frequency division modulation (OFDM) and demodulation. The gain can be corrected, to that of a conventional FFT, by applying a constant multiplying factor.
Platform: | Size: 183296 | Author: Nagendran | Hits:

[VHDL-FPGA-Verilog] FPGA-based-multi-Divider

Description: 分频器是指使输出信号频率为输入信号频率1/N的电子电路,N是分频系数。在许多电子设备中如电子钟、频率合成器等，需要各种不同频率的信号协同工作，常用的方法是以稳定度高的晶体振荡器为主振源，通过变换得到所需要的各种频率成分，分频器是一种主要变换手段。 本文当中，在分析研究和总结了分频技术的发展趋势的基础上，以实用、可靠、经济等设计原则为目标，介绍了基于FPGA的多种分频器的设计思路和实现方法。本设计采用EDA技术，以硬件描述语言VHDL为系统逻辑描述手段设计文件，在QuartusⅡ工具软件环境下，采用自顶向下的设计方法，由各个基本模块共同构建了一个基于FPGA的分频器。 本次设计实现了包括整数、半整数和小数这三种不同类型分频器的分频，在设计过程中，系统主芯片采用EP1C6Q240C8，各个模块在QuartusⅡ上进行编程调试和仿真通过后，在GW48-SOPC上进行了下载。通过对各个部分测试后表明均能正确分频，完成了对系统的软件和硬件的设计，达到了系统的设计要求。 -Frequency divider refers to the frequency of the output signal as the input signal 1/N of electronic circuits. N is the frequency coefficient. In many electronic equipments such as the electronic clock, frequency synthesizers, which need different frequency signals work together and common way is to use the stability of the crystal oscillator as vibration source by converting the frequency components all needed. The frequency divider is a major means of conversion. In this paper, with the analytic study and review of trend basis of the technical frequency, a functional, reliable, economic and other design principles as the goal, this paper introduces a number of points frequency of the design and implementation based on FPGA. This design adopts the technology of EDA and hardware description language VHDL as logical description means of designing files. Under the environment of QuartusⅡ tools and the top-to-down approach, they build jointly a frequency divider by the basic modules base
Platform: | Size: 5120 | Author: 吴红梅 | Hits:

[VHDL-FPGA-Verilog] fenpin

Description: VHDL编写的分频器，占空比为1:1，可以根据需要，修改计数器，完成不同频率的分频-Divider in VHDL, the duty cycle of 1:1, as needed, modify the counter, complete different frequency divider
Platform: | Size: 1024 | Author: 小幂控 | Hits:

[VHDL-FPGA-Verilog] huxi

Description: 基于VHDL设计四个频率不同的呼吸灯，呼吸频率分别为 0.1Hz,0.2Hz，0.4Hz，0.8Hz 呼吸灯原理：利用PWM波控制led的亮度，的 原始代码 quartus软件亲测可用。-VHDL-based design in four different frequencies breathing light, breathing frequency was 0.1Hz, 0.2Hz, 0.4Hz, 0.8Hz breathing light principle: the use PWM to control the brightness led the wave, the source code is available quartus software pro-test.
Platform: | Size: 1024 | Author: 司维 | Hits:

[VHDL-FPGA-Verilog] music

Description: VHDL电子琴，采用vhdl编写，通过蜂鸣器发出7种不同频率的音阶实现简易电子琴功能。-VHDL electronic organ, written by VHDL, the realization of simple electronic organ function in 7 different frequency scale through the buzzer.
Platform: | Size: 198656 | Author: Ronge | Hits:

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