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Depth analysis of Speex echo cancellation principle

estimated by the local (near-end) speech + filter.\[d (n) = V (n) + \sum\nolimits_k {{{\hat w}_k} (n) x (n-k)} \]The coefficients update equation of the filter can be rewritten as\[{\delta _k} (n + 1) = {\delta _k} (N) + \mu \frac{{(V (n)-\sum\nolimits_i {{\delta _i} (n) x (n-i)}) {x^*} (n-k)}}{{\sum\ Nolimits_{i = 0}^{n-1} {|x (n-i) {|^2}}}}\]If the offset at each moment is defined as:\[\LAMBDA (N) = \sum\nolimits_k {\delta _k^* (n) {\delta _k} (N)} \]Then, in each iteration of the step, the o

Foundation of Image Processing-Gaussian low-pass filter template generation C implementation

() Code implementation Perform Gaussian smoothing on the source image to remove computing noise in the image.Void BMP: makegauss (double Sigma, double ** pdkernel, int * pnwindowsize ){// Cyclic control variableInt I;// Center of the arrayInt ncenter;// The distance from a point in the array to the center pointDouble DDIs;// Intermediate variableDouble dvalue;Double dsum;Dsum = 0; // Array length. Based on the knowledge of probability theory, select d

Image Gaussian blur application-involving the use of libjpeg, NDK operations on Surfaceview, image obfuscation, source code

documentCursorcursor = Managedquery (Originaluri, proj, NULL, NULL,NULL);As I understand it, this is the index value of the image that the user chooses.int Column_index =cursor. Getcolumnindexorthrow (MediaStore.Images.Media.DATA);Move the cursor to the beginning, this is important, careless can easily cause a cross-borderCursor.movetofirst ();Finally get the picture path according to the index valueString path =cursor.getstring (column_index);With the suffix name, the initial judgment is wheth

C # itself implements thread pool function (ii)

(Taskqueue) { try { if (Taskqueue.count > 0) task = Taskqueue.dequeue (); else task = null; } catch (Exception) { task = null; } if (task = = null) continue; Add two variables to the Threadpoolmanager clas

[Zz] Sift learning remarks

possible kernel functions for building a scale space, this is the conclusion, and the principle is not clear. In many places, the concept of a kernel function is actually a conversion operation. The original image and the Gaussian Kernel are used for Convolution to obtain new images. Gaussian is the normal distribution function. Here we use N (0, Sigma square). Regarding the symmetry of 0 points, the Sigma

[Zhan Xiang matrix theory exercise reference] exercise 5.4

4. (G.M. krause) to $ \ bex \ lm_1 = 1, \ quad \ lm_2 = \ frac {4 + 5 \ sqrt {3} I} {13 }, \ quad \ lm_3 = \ frac {-1 + 2 \ sqrt {3} I} {13 }, \ quad v = \ sex {\ sqrt {\ frac {5} {8 }}, \ frac {1} {2 }, \ sqrt {\ frac {1} {8 }}^ T. \ eex $ then make $ \ bex A = \ diag (\ lm_1, \ lm_2, \ lm_3), \ quad U = I-2vv ^ T, \ quad B =-U ^ * AU, \ eex $ then $ U $ is the matrix, $ A, B $ is the regular matrix. verify $ \ bex \ rd (\ sigma (A), \

thinkphp Mobile using a concise tutorial _php tutorial

on the phone.Hybridapp The advantages of Nativeapp and WebApp respectively. We can use HTML,CSS,JS to develop, compatible with multiple platforms. Users also want to download the installation, and can call the phone's camera, contacts and other functions, Hybridapp static resources are also on the phone local.We know that thinkphp's templates are also developed with HTML,CSS,JS. So we want to be able to package the thinkphp template directly into the mobile app? Let us be able to open at the sa

Graphic explanation of BitLocker attack guide process

Bkjia.com exclusive Article] A few days ago, Fraunhofer SIT security lab said they have successfully cracked Windows 7's disk encryption technology BitLocker. Fraunhofer SIT researchers say they can successfully crack data on disks even if BitLocker is used together with a hardware-based Trusted Platform Module (TPM. This article provides a detailed explanation of the complete process of cracking BitLocker through text and text. 1. Encryption and mali

The principle of singular value decomposition (SVD) and its application in dimensionality reduction

matrix A can be decomposed with the following formula: $ $A =w\sigma w^{-1}$$Where W is the $n \times n$ dimensional matrix spanned by this $n$ eigenvector, and $\sigma$ is the $n \times n$ dimension matrix of these n eigenvalues as the main diagonal.In general, we will standardize the $n$ of W, which satisfies $| | w_i| | _2 =1$, or $w_i^tw_i =1$, at this time the $n$ characteristic vector of W is the sta

Gu Pei abstract algebra 1.4 "group homomorphic and homogeneous" Exercise answers

: N _ {1} \ to N _ {2} \ 2a \ mapsto 3A \ end {Align *} However, $ g _ {1}/N _ {1} = \ mathbb Z _ {2 }, g _ {2}/N _ {2} = \ mathbb Z _ {3} $, while $ | \ Mathbb Z _ {2} | = 2, | \ mathbb Z _ {3} | = 3 $ Obviously, the two are not homogeneous. Additional questions: 1. proof theorem 1.4.8. The content is as follows: If $ F $ is the full homomorphic of the group $ g _ {1} $ to $ g _ {2} $, remember $ n ={\ RM Ker} f $, then (1) $ F $ creates a bishot between a subgroup of $ N $ and a sub

Bzoj 2301-mo

For the given n queries, how many pairs (x, y) are asked each time , satisfy a≤x≤b, c≤y≤D, and gcd (x, y) = k, gcd (x,y) function x and the greatest common divisor of Y. The topic here is very obvious. for required f[n] = Sigma (A≤x≤b) Sigma (C≤y≤ [gcd (x, y) =k] =sigma (1≤x≤b) sigma (1≤y≤d) [gcd (x, y) =k] +

"Abstract algebra" 02-Algebra and Group

isomorphic to a true subgroup of \ (s_n\), and the Order of infinite groups is isomorphic to a true subgroup ( Gloria theorem ) of \ (S (G) \).In this way, we can study the general group by discussing the subgroups of the symmetric group. The subgroups of the symmetric group are called permutation groups (permutation group) (because the elements are permutations), and the subgroups of \ (s_n\) are called \ (n\) times permutation groups, here we only discuss the \ (n\) permutation group. The ele

Reading notes: Neuralnetworkanddeeplearning CHAPTER5

network output is \ (a_j=\sigma (Z_j) \),\ (z_j=w_ja_{j-1}+b_j\).Below, we ask out \ (\partial c/\partial b_1\)to see what causes this value to be small.According to the BP formula can be introduced:The formula looks slightly more complicated than it is, so let's take a look at how it came about. Since the network is very simple (there is only one strand), we are prepared to introduce it from another, more visual angle (BP is also fully capable of in

Windows Server 2016-system installation hardware and software requirements

with at least gigabit throughput. Complies with PCI Express architecture specifications. Supports pre-boot execution Environment (PXE). network adapters that support network debugging (KDNet) are useful, but not a minimum requirement.Other requirementsThe computer that is running this version must also have: DVD drive (if you want to install the operating system from DVD media) The following are not strictly required, but some specific features require: UEFI

C # itself implements thread pool function (ii)

(Taskqueue) { try { if (Taskqueue.count > 0) task = Taskqueue.dequeue (); else task = null; } catch (Exception) { task = null; } if (task = = null) continue; }Add two variables to the Thread

EM algorithm for parameter estimation of Gaussian mixture model

1 #Coding:utf-82 ImportNumPy as NP3 4 defQQ (Y,alpha,mu,sigma,k,gama):#Calculate Q function5gsum=[]6n=Len (y)7 forKinchRange (K):8Gsum.append (Np.sum ([gama[j,k] forJinchrange (n)]))9 returnNp.sum ([G*np.log (AK) forG,akinchZip (Gsum,alpha)]) +TenNp.sum ([[[Np.sum] (gama[j,k]* (Np.log (1/np.sqrt (2*NP.PI))-np.log (Np.sqrt (Sigma[k])) -1/2/sigma[k]* (Y[j]

Generate a random number that follows a normal distribution.

large and smaller than μs. The following method can be used to ensure this: points are randomly generated in the large rectangle in Figure 2. These points are evenly distributed. If the generated points fall below the probability density curve, the generated points are considered to meet the requirements, keep them. If they are above the probability density curve, they are considered unqualified and placed. If a large number of points are randomly distributed evenly in the entire rectangle, the

A detailed analysis of Gauss function _ paper one data

view the Gauss function, in the actual programming application, the Gaussian function parameter has The size of ksize Gaussian function Variance of Sigma Gaussian function Center point coordinates of centre Gaussian function Bias the offset of the center point of the Gaussian function to control the truncated Gaussian function In order to conveniently observe the Gaussian function parameter change and the result is different, the following code reali

Machine Learning Mathematics | Skewness and kurtosis and its implementation of Python

represents the average of squaredNiu3=0.0 # NIU3 means three-time average forAinchData:niu+=A NIU2+=A**2Niu3+=A**3Niu/=N NIU2/=N NIU3/=N Sigma=MATH.SQRT (NIU2-Niu*Niureturn[NIU,SIGMA,NIU3] \[niu=\bar{x_{i}} is expected \] \[niu2=\frac{\sum_{i=1}^{n}x_{i}^{2}}{n}\] \[niu3=\frac{\sum_{i=1}^{n}x_{i}^{3}}{n}\] Sigma means that the standard d

HP microserver Gen8 Processor FAQ

over the 1260L on this area.For complete CPUs specifications on the Xeon E3 families, check out the following links:Xeon E3 (Sandy Bridge) Family:http://ark.intel.com...ts/series/53495Xeon E3 v2 (Ivy Bridge) Family:Http://ark.intel.com...2-Family/serverWikipedia also have excellent links if you search for "Sandy Bridge", "Ivy Bridge", or "Xeon" to explain history and Archit Ectural changes.Note:something I did not realize until working more deeply today when replacing my Gen8 microserver ' s pr

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