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Description: OFDM信号的编码译码仿真，英文说明更详细。-This simulation script set allows for an OFDM transmission to be
simulated. Imagetx.m generates the OFDM signal, saving it as a
windows WAV file. This allows the OFDM signal to be played out a sound
card and recorded back. Imagerx.m decodes the WAV to extract the
data.
settings.m contains all the common settings to specify all the
simulation parameters such as FFT size, number of carriers,
input data source file, input and output WAV files, etc.
See settings.m for more details.
Note: The both the receiver and transmitter must have a copy of the
input data file, as this is used for calculating the exact number
of data words in the transmission.
The scripts should work as extracted. Just run imagetx.m to generate the
OFDM signal. Then run imagerx.m to decode the signal. The initial settings
transmit a wave file Corrs.wav . The decoded OFDM data ( Out.wav ) can be
compared with the original data by listening to the two wave files.
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Size: 59392 |
Author: 以琳 |
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Description: OFDM程序，这么安排矩阵的目的是为了构造共轭对称矩阵
共轭对称矩阵的特点是 在ifft/fft的矢量上 N点的矢量
在0，N/2点必须是实数 一般选为0
1至N/2点 与 （N/2）+1至N-1点关于N/2共轭对称- BPSK simulation using a carrier cosine wave with ISI
clc
close all
clear all
figure(1)
n=160
for i=1:n
data(i)= 2*round(rand)-1
end
create modulated BPSK signal
first expand the bit stream
exdata=[]
for i=1:length(data)
for rep=1:5
exdata= [exdata data(i)]
end
end
ts=.1
t=1:ts:80.9
carrier=cos(pi*t)
multiply expanded bitstream by cosine wave with carrier frequency
this is the BPSK that is to be transmitted over the channel
bpsk=carrier.*exdata
bpsk=[bpsk(length(bpsk)-1) bpsk(length(bpsk)) bpsk]
plot(bpsk)
generating the noise
p=rand(1,800)*2*pi
p=rand*2*pi
snr=10
r=sqrt(-1*(1/snr*log(1- rand)))
no = 5*(r.* exp(j*p))
no = (r.* exp(j*p))
value of alpha
al=rand+j*rand
al=1
Spreading channel with the alpha as the variable
for k=5:5:795
for l = 1:5
al=round(rand)+j*round(rand)
rec(k+l)=bpsk(k+l)+al*bpsk(k-5+l)
end
end
rxdata=rec+ no
begin demodulation
first multiply recie
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Size: 6146048 |
Author: 卞敏捷 |
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Description: 一个模拟的心电信号的matlab程序，其中一共包含了一个主程序和6个小程序，小程序分别是q波，s波，u波，p波，t波以及QRS波的模拟，运行的时候直接运行主程序complete.m 文件即可，运行良好，可以出波形-A simulated ECG of the matlab program, which includes a total of six small main program and procedures, the procedures are small q-wave, s-wave, u-wave, p-wave, t-wave and QRS wave simulation, run time complete.m documents directly to the main program to run, run well, can be a waveform
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Size: 2048 |
Author: zhengp |
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Description: 一個3d的fft ocean wave simulation-a 3d fft ocean wave simulation
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Size: 1849344 |
Author: LinMengHsun |
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Description: wave波形文件读取，并通过FFT运算后图形显示频谱。-read .wav file and dispaly spectrum.
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Size: 6482944 |
Author: cszhaoqm |
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Description: dsk 6713 prograams for filter, fft, wave genaration etc
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Size: 1476608 |
Author: Artidwivedi |
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Description: 这是一个简单的应用我建立理解波的Windows音频API的基础知识，并获得一个快速傅立叶变换（FFT变换）的基本掌握。它的功能是：双缓冲绘图，取样的音频源，选择一个录音源使用搅拌机，FFT频谱计算阵列，并策划采样数据。
-This is a simple application I built to understand the basics of the Windows Audio WAVE API, and to get a basic grasp on Fast Fourier Transforms (FFTs). Features of the application are: double buffering graphics, sampling an audio source, selecting an audio recording source using the mixer, calculating the FFT spectrum array, and plotting sampled data.
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Size: 1137664 |
Author: wu |
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Description: 信号频谱分析
1. 观测已知方波信号、正弦波信号的频谱
分析频率为4KHz、8KHz的占空比为50 的方波信号、正弦波信号的频谱。记录所得频谱图。
2. 观测实时模拟信号（语音）的频谱
用音频设备采集一段语音，将语音存为.wav格式。对wav文件作分段傅里叶变换分析。语音是分音节的，应把它分段分析，而且实际运用中的数字信号处理的FFT的点数是有限的，一般只能达到千点。用傅里叶反变换IFFT，从频域恢复信号。画出频谱图和语音波形图-Signal spectrum analysis 1. Observing a known square-wave signal, sine wave signal frequency spectrum analysis 4KHz, 8KHz for the 50 duty cycle square wave signal, sine wave signal frequency spectrum. The recorded frequency spectrum. 2. Observing real-time analog signal (voice) of the spectrum collected with the audio devices section of voice, voice saved as. Wav format. Wav file of the sub-Fourier transform analysis to make. Speech is divided into syllables, it should be sub-analysis, and practical application of digital signal processing of the FFT points is limited, generally only reach 1000 points. Fourier inverse transform IFFT, to restore the signal from the frequency domain. Draw maps and voice waveform spectrum
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Size: 64512 |
Author: benny |
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Description: 信号频谱分析
1. 观测已知方波信号、正弦波信号的频谱
分析频率为4KHz、8KHz的占空比为50 的方波信号、正弦波信号的频谱。记录所得频谱图。
观测实时模拟信号（语音）的频谱
用音频设备采集一段语音，将语音存为.wav格式。对wav文件作分段傅里叶变换分析。语音是分音节的，应把它分段分析，而且实际运用中的数字信号处理的FFT的点数是有限的，一般只能达到千点。用傅里叶反变换IFFT，从频域恢复信号。画出频谱图和语音波形图-Signal spectrum analysis 1. Observing a known square-wave signal, sine wave signal frequency spectrum analysis 4KHz, 8KHz for the 50 duty cycle square wave signal, sine wave signal frequency spectrum. The recorded frequency spectrum. Observing real-time analog signal (voice) of the spectrum collected with the audio devices section of voice, voice saved as. Wav format. Wav file of the sub-Fourier transform analysis to make. Speech is divided into syllables, it should be sub-analysis, and practical application of digital signal processing of the FFT points is limited, generally only reach 1000 points. Fourier inverse transform IFFT, to restore the signal from the frequency domain. Draw maps and voice waveform spectrum
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Size: 94208 |
Author: benny |
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Description: 数字信号处理的程序，快速傅立叶变化，FFT，频谱分析，三角波，矩形波，脉冲波，很好的学习资料，很值得下载哟--Fourier changes, FFT, spectrum analysis, triangle wave, square wave pulse, a very good learning materials, is worth downloading yo
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Size: 7168 |
Author: 1239274585 |
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Description: musicdsp source code archive-Analysis
Beat Detector Class
Coefficients for Daubechies wavelets 1-38
DFT
Envelope detector
Envelope Detector class (C++)
Envelope follower with different attack and release
Fast in-place Walsh-Hadamard Transform
FFT
FFT classes in C++ and Object Pascal
Frequency response from biquad coefficients
Java FFT
Look ahead limiting
LPC analysis (autocorrelation+ Levinson-Durbin recursion)
Magnitude and phase plot of arbitrary IIR function, up to 5th order
Measuring interpollation noise
QFT and DQFT (double precision) classes
Simple peak follower
tone detection with Goertzel
Tone detection with Goertzel (x86 ASM)
Effects
2 Wave shaping things
Alien Wah
Band Limited PWM Generator
Bit quantization/reduction effect
Class for waveguide/delay effects
Compressor
Decimator
Delay time calculation for reverberation
DIRAC- Free C/C++ Library for Time and Pitch Manipulation of Audio Based on Time-Frequency Transforms
dynamic convolution
Early echo s with image-mirror techn
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Size: 826368 |
Author: Alan Tang |
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Description: DSP下FFT算法的实现，即时分析所给波形的频谱。很好用！-Under the DSP FFT algorithm, real-time analysis to the wave spectrum. Good use!
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Size: 39936 |
Author: 林述颖 |
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Description: c语言实现对输入正弦波信号的采样、保存、傅里叶变换、取模显示，希望对大家有用啊，毕设的一个模块-c language input sine wave signal sampling, preservation, Fourier transform, modulus show, we want to be useful, ah, complete set of a module. . . .
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Size: 1024 |
Author: zhouyanmei |
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Description: 在CCS环境下，调用TI的DSPLIB FFT、IFFT函数的例子。
定义了正弦信号和方波信号，可以帮助DSP初学者理解DSPLIB FFT相关函数的调用。-In the CCS environment, calling TI DSPLIB FFT, IFFT function example. Defines a sinusoidal signal and the square wave signal that can help beginners understand DSPLIB FFT DSP correlation function call.
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Size: 48128 |
Author: shaunna |
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Description: 用Matlab产生正弦波,矩形波,以及白噪声信号，并显示各自时域波形图，FFT实践及频谱分析-Matlab generated by sine wave, square wave, and the white noise signal, and display their time-domain waveform, FFT spectrum analysis of practice and
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Size: 1024 |
Author: qin |
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Description: 实现基于FFT、Perlin噪声、Gerstner三种模型的海浪仿真模拟，实现了海水的反射、折射、Fresnel现象的模拟。-Implementation based on FFT, Perlin noise, Gerstner wave simulation of the three models, to achieve the water reflection, refraction, Fresnel simulation of the phenomenon.
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Size: 2386944 |
Author: chenmao |
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Description: show spectogram of wave file.
It use FFT to draw spectrum of sound.
only support saved wave file.
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Size: 44032 |
Author: nowpudo |
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Description: this program calculates the twiddle factors, generator sine wave with user setting sample rate, signal frequency. The user interface gives parameter setting of sample frequency, signal freqency and number of sample and so on.
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Size: 273408 |
Author: Jim Lai |
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Description: this file is about finding Fast fourier transform for given sine wave using FFT statement.
i. with zero padding
II. without zero padding
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Size: 1024 |
Author: mohanrajan |
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Description: 用VB实现对文本文件中的数据进行离散的FFT变换，在两个窗口中分别显示指定区域的时域信号和FFT之后的频域信号。 并可以进行SIN,Triangle,Square三种简单波形的自我模拟变换。-Text file data discrete FFT, respectively, in the two windows display the specified area and time-domain signal after the FFT frequency domain signal. And can be SIN, Triangle, Square wave of self-simulation of three simple transformations.
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Size: 37888 |
Author: dongxiao |
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