From: http://blog.sina.com.cn/s/blog_4af018020100ef2k.html
Fence Effect : For the spectrum of Sampled Signals, FFT is usually used to improve the computing efficiency.
Algorithm For calculation, set the number of data points
N = T/dt = T. FS
The calculated discrete frequency point is
Xs (FI), FI = I. fs/N, I = 0, 1, 2 ,..., N/2
This is equivalent to viewing the landscape through a fence. only part of the
The series of consecutive time signals after sampling and truncation is Xn (n), and its spectrum function Xn (ejw) does not change with the completion of the end of the series, the signal frequency resolution is fs/n. the completion of zero at the end of the sequence can only increase the resolution of the signal spectrum display. In other words, if the information in the signal
In general, the sine-cosine signal is sampled and the DfT is calculated, and the spectrum is shown to be not clean. This phenomenon is called spectral leakage. Because the DFT operation can only be a finite sequence, a sudden truncation creates a leak.
There is a special case where the spectrogram is particularly clean when the sampling intercept is exactly the whole number of cycles. Can be understood as just take the complete cycle, the periodicity
Power spectrum estimation is to estimate the signal's power with the change of frequency, the actual use of filter, signal recognition (analysis of the frequency of the signal), signal separation, system identification. Spectral estimation technology is an important part of modern signal processing, including spatial spectral estimation, high-order spectral estimation and so on. Wiener Filter, Kalman filter, can be used for adaptive filtering, sig
Compared to the traditional Wi-Fi signal, the unused frequency of white spaces will have a more significant development prospects, so Google created an API that can make this part of the resource easier to use. Using this Spectrum database API, the Spectrum data API can be used to search for frequencies not yet occupied by television and radio signals, especially in the U.S. region, and to register devices
Web development and design of Google Weapon Spectrum-web development and design toolBlog Category:
Java synthesis
WebgoogleajaxchromegwtThe author is a Java enthusiast is also a Java for web development workers. Usually the author's favorite browser is Firefox, because it can bring a lot of IE does not have the excellent debugging function, said the truth I have always felt that Ms seems to be very attached to the browser. Regardless of
With the division of spectrum resources, a huge rock in the road of TD-LTE commercialization was moved. At the recently held "TD-LTE technology and spectrum Seminar", China's 2.6GHz spectrum planning scheme was announced,-2690hz of the 2.6GHz band all divided into TDD spectrum. The determination of
This article describes how to build a spectrum development environment in a MAC OS x environment.
Environment configuration
Installing Golang
brew install go
Configuring Golang Environment variables
vim ~/.bash_profile
Add Gopath under ~/.bash_profile
#replace ~/go_project with your pathexport GOPATH=~/go_project export PATH=.:$PATH:$GOPATH:$GOPATH/bin
Create a src,pkg,bin directory under Gopath
mkdir -p $GOPATH/bin $GOPATH/pkg $GOPATH/src
Detect GO
When using the js-sdk to collect audio, you want to display the spectrum in real time, but you do not know how to detect the recording parameters in this case. Is there a good way to achieve the desired effect like webaudiodemos. appspot. comAudioR?
When using the js-sdk to collect audio, you want to display the spectrum in real time, but you do not know how to detect the recording parameters in this case.
Shannon theorem: c = wlog2 (1 + S/N) or C = WLB (1 + S/N) (LB and log2 are the same)C Indicates the channel capacity, measured in bits per second (B/S)W indicates the bandwidth required for transmitting information. The unit is Hz;S represents the average signal power;N represents the average noise power;Spectrum Efficiency: transmission capability per unit frequency:C/W = LB (1 + S/N)There is a relationship between Shannon theorem and
The following MATLAB program uses the cycle graph method, correlation function method, and AR Spectrum Method to Calculate the power spectrum of signals.
% Power Spectrum estimatedclear all; clc; close all; FS = 1000; % sampling frequency nfft = 1024; % FFT calculation points % generate noise-containing sequence n =/Fs: 1; xn = cos (2 * pI * 100 * n) + 3 * Cos (2
Address: Http://qs20199.github.io/paino, support pc/touch screen, CSS3 animation only wrote WebKit.Recently started playing the piano, the first hurdle is to read the piano spectrum, to find a help memory staff and piano keys corresponding to the tool, did not see the right, wrote a.The input in the upper-right corner can customize the practice interval, such as entering 0,5, which can refer to the top five tones of the practice, and so on, the maximu
P68Spectrum: The vast majority of signals can decompose a number of different frequency sine waves, in some sine waves, the lowest frequency is called the fundamental wave of the signal, the rest is called signal harmonics, equivalent to the basic frequency of the signal. The sine wave component, which has a frequency equal to the base frequency integer, is called harmonics.Comparison of image and spectrum after logarithmic transformation of 1.fft2 Ff
When capturing audio with JS-SDK, you want to be able to display the spectrum in real time, but do not know how to test the recording parameters in this case.
The effect you want to achieve is like
Https://webaudiodemos.appspot.com/AudioR ...
Is there a better way to implement it?
Reply content:
When capturing audio with JS-SDK, you want to be able to display the spectrum in real time, but do not k
Recently, IEEE Spectrum has unveiled one of the most popular programming language rankings. The leaderboard screened 12 indicators, combined with 10 sources (including IEEE Xplore, Google, GitHub), and finally ranked the following (out of 100, the higher the ranking, the more forward), of which the top ten programming languages were:1. Java2, C3. C + +4, CNo.5. Python6. JavaScript7. PHP8. Ruby9. SQL10, MATLABRanking by type, the leaderboards for each
On the physical meaning of negative frequency in spectrum
--Reading analysis
* Statement: This article is a large number of references to Chen Hui deep, Fang Haiyan of the relevant paper content* This article is the best I've ever read to explain the negative frequency of the spectrum, just to pay tribute to the two authors in this blog post.
Absrtact:
Spectrum Chain Development--ide Breakpoint Debugging Introduction
作者:GirpZhang
Experimental environment
Windows10
Go1.9.2.windows-amd64
Visual Studio Code
Git 2.18.0
Need to complete the Visual Studio Code + Golang Development environment configuration
Installing GO1.9.2.WINDOWS-AMD64
Install Git
Install Golang, configure Gopath本例中使用的 "GOPATH":"E:/GoPath";"GOROOT":"E:/Go"
Install Visual Studio Code, install the Go plu
Tiantie has become a hot topic in academia, industry, and industry. IEEE spectrum published a feature article on the ladder on September 13, August. It can be seen that its idea has a wide influence. Spectrum's first edition features
ArticleIt is generally very interesting to write. This article is no exception. We strongly recommend that you read it as soon as possible. Maybe, in our lifetime, we could have the opportunity to take the ladder to the
costume designer was burst material said design before always sat, otherwise no inspiration.So, before writing the JS code, should also be read what mantra?"Burn It, fire bird." This is the first word that I want to jump out of my mind.----------------------------------------------------------------------------Some people say, the world article a big copy.This word is used in the programming world, called code reuse.In C + +, a class is a significant embodiment of code reuse.JS6 no class before
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