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Knowledge and technical parameters of audio coding

to three Hz. It uses the MS-frame to provide 40ms algorithm latency.The G722.1 achieves lower bit rates and greater compression than the g.722 codec. The goal is to achieve roughly the same quality as the g.722 at approximately half the bit rate. This license to use the code requires the authorization of Polycom Corporation.5, G722.1 Annex CThe G722.1 Annex C is based on Polycom's siren 14 compression technology, which uses 32kHz sampling frequency t

Popular Understanding N-gram language model.

counting is logically completely OK, but because of the flexible nature of language, and the size of the corpus is always limited, for a slightly longer sentence, it is probably not in the corpus. For example, the following sentence: "I am looking for a restaurant to eat breakfast", intuitively, this sentence in corpus should appear a lot of times it? But if you enter this sentence into Google's search box and click Search, you will find that there is no exact match on the returned results. The

A brief introduction to the N-gram language model

of counting is logically completely OK, but because of the flexible nature of language, and the size of the corpus is always limited, for a slightly longer sentence, it is probably not in the corpus. For example, the following sentence: "I am looking for a restaurant to eat breakfast", intuitively, this sentence in corpus should appear a lot of times it? But if you enter this sentence into Google's search box and click Search, you will find that there is no exact match on the returned results.

C ++ implements Unicode Code Conversion to UTF-16 code addition and decoding Functions

, trail surrogate]: Two 16bits code units, with the value ranges of 0xd800 .. 0xdbff and 0xdc00 .. 0 xdfff. The range of the Code unit obtained in BMP is 0x0000 .. 0 xFFFF (0xd800 .. 0xdfff is retained and does not include it). Therefore, these three segments do not overlap with each other and are easy to implement during decoding. Decoding UTF-16 Hi \ Lo Dc00 DC01 ... Dfff D800 10000 10001 ... 103ff D801 10400 10401 ... 00

The principle and realization of IIR Gaussian filter

//Sigma: Gaussian standard deviation//**************************************************************//Is_ret iirgaussianfilter (Tmatrix *src,tmatrix *dest,floatSigma) { intX,y,width=src->width,height=src->height,stride=src->widthstep,channel=src->Channel; Gauss_coefs C; COMPUTE_COEFS3 (C,sigma); unsignedChar*lineps,*LINEPD; float*buff,*bpointer,*w1,*W2; Buff=(float*)malloc(sizeof(float) *height*width);//Cache if(Buff==null) {returnIs_ret_err_

"Language model (Language Modeling)", Stanford University, Natural Language processing, lesson four

(Eyes awe of an) Voice Word conversion : P (What do you do now | Nixianzaiganshenme) > P (What are you doing in Xian | Nixianzaiganshenme) Automatic Digest, question and answer system 、... ... The formal representation of the above questions is as follows:P (S) =p (w1,w2,w3,w4,w5,..., WN)=p (W1) p (W2|W1) p (w3|w1,w2) ... p (wn|w1,

Use of bitwise operators

Truth Tables) shows the results of the execution and operation of B1 and B2 under all possible values of B1 and B2.B1 B2 B1 B2——————————0 0 00 1 01 0 01 1 1For example, if W1 and W2 are defined as short int, W1 equals 16, and W2 equals 16 in 0c, the following C statement assigns the value 0x04 to W3.W3 = W1 W2;This procedure can be seen more clearly after W1,

Machine learning--Realization of perceptron algorithm

This is also written in processing3.0+, its official website https://processing.org/, suggest to look directly at reference example to learn.Perceptron algorithm is used by our teacher to give the PPT, the realization of the two-dimensional perceptron, in order to facilitate the look, in fact, multi-dimensional is the same:The operating effect is:For testing convenience, I am using a click to pick the point, the keyboard click T, the case can be, the next point is a positive example, click F, th

Machine learning--the first chapter Bayes theorem and its application

) .....Bayesian estimationIt is possible to estimate a probability value of 0 with maximum likelihood, which will affect the calculation result of the posterior probability and make the classification biased. We use Bayesian estimation, that is, to add a λ correction parameterBayesian Formula P (b| A) = (P (AB) +λ)/(P (A) + sλ) λ>= 0 s indicates the frequency of each value of the random variableJunk e-mail filteringSpam is the inclusion of certain words, we only find these words, and calculated

Pattern Recognition: Realization of Perceptron

several kinds of samples; for two kinds of sample points W1 and W2, the sample point set is represented as:, using a discriminant function to divide W1 and W2, It is necessary to use these sample sets to determine the weighted vector aof the discriminant function, which can take the augmented sample vector y, i.e. there is a suitable augmented weight vector a, which makes:whichThe sample is said to be line

Basic Lua Summary (two Lua program examples)

text and create a table. Each two words is a prefix, which stores the words (possibly multiple) after the prefix in the basic text into the table. After the table is created, the program uses this table to randomly generate text. The probability of words with each prefix is roughly the same as that in basic text. In this way, we can get a fairly random text. We will link the two words with a space "" and encode them as the prefix: function prefix (w1, w2

The HMM in participle

http://blog.csdn.net/heavendai/article/details/70301021. First of all, the Markov chain.The probability of the occurrence of an event sequence can be expanded using the multiplication formula in the probability theory below.P (w1,w2,... WN) = P (W1) p (W2|W1) p (w3| W1 w2) ... P (WN|W1 w2...wn-1)The proof of the multip

The HMM in participle

1. First of all, the Markov chain. The probability of the occurrence of an event sequence can be expanded using the multiplication formula in the probability theory below. P (w1,w2,... WN) = P (W1) p (W2|W1) p (w3| W1 w2) ... P (WN|W1 w2...wn-1) The proof of the multiplication formula is very interesting, it is its

C # equality comparison,

;}Public override bool Equals (object obj){If (obj = null)Return this = null; If (! (Obj is Widget ))Return false;Widget w = obj as Widget;Return this. UID = w. UID;} Public override int GetHashCode (){Return this. UID. GetHashCode ();} Public static bool operator = (Widget w1, Widget w2){Return w1.Equals (w2 );} Public static bool operator! = (Widget w1, Widget w2

Starting with a simple example, learn to write makefile (i)

file. When we execute the gmake again, we will be prompted to update the file and do nothing. At this point, if you modify the Test.cpp command, execute the gmake command again. Because the dependency is newer than the target file, g++-o test test.cpp the command is executed again. Now that we've learned how to write a simple makefile file, every time we modify the source file, we can get the program we want to build with the gmake command, without having to repeatedly knock g++-O test tes

Truly efficient SQL Server paging query (multiple scenarios) _mssql

SQL Server database paging query has been a short board of SQL Server, idle, come up with several methods, assuming that there are table article, Field ID, year ... (other omitted), Data 53,210 (customer real data, quantity is not large), paging query each page 30, query page 1500th (ie 第45001-45030条 data), field ID clustered index, Year no index, SQL Server version: 2008R2 The first scheme, the simplest, the common method: Copy Code code as follows: Select Top * from ARTICLE WH

Truly efficient paging queries for SQL Server (multiple scenarios)

) W2 WHERE w1.id = W2.id ORDER by W1. Year DESC, W1.id DESCAverage 100 times required: 21SThe fourth option :Copy CodeThe code is as follows:SELECT * FROM article W1WHERE ID in(SELECT Top ID from(SELECT top 45030 ID, year from article ORDER by year DESC, id desc) W ORDER by w.year ASC, w.id ASC)ORDER by W1. Year DESC, W1.id DESCAverage 100 times required: 20SThe fifth option :Copy CodeThe code is as follows

Efficient SQL Server paging query (reprint)

Tags: des blog http ar strong data div sp ArtSQL Server database paging query has been SQL Server's short board, Idle to do nothing, think of several methods, assuming that there is a table article, Field ID, year ... (other omitted), Data 53,210 (customer real data, amount of small), page 30 per page, query page 1500th (that is, 第45001-45030条 data), field ID clustered index, Year no index, SQL Server version: 2008R2The first scenario, the simplest and the most common method:Select top article W

IOS--Get the size of local pictures and network pictures

] Returningresponse:nil Error:nil]; UIImage* Image =[UIImage Imagewithdata:data]; if(image) {size=image.size; } } returnsize;}//get the size of a PNG picture+ (Cgsize) Getpngimagesizewithrequest: (nsmutableurlrequest*) request{[request SetValue:@"bytes=16-23"Forhttpheaderfield:@"Range"]; NSData* data =[nsurlconnection sendsynchronousrequest:request returningresponse:nil Error:nil]; if(Data.length = =8) { intW1 =0, W2 =0, W3 =0, W4 =0;

Don't let MySQL hesitate.

Tags: engine select key Sam MySQL charset utf8 efault val 1 DROP TABLE IF EXISTS' W1 ';2 CREATE TABLE' W1 ' (3' Waid 'int( One) not NULLAuto_increment,4' WA1 'varchar(255) COLLATE Utf8mb4_binDEFAULT NULL, 5' Wa2 'varchar(255) COLLATE Utf8mb4_binDEFAULT NULL, 6 PRIMARY KEY(' Waid ')7) ENGINE=MyISAM auto_increment=3 DEFAULTCHARSET=UTF8MB4 COLLATE=Utf8mb4_bin;8 9 -- ---------------------------- Ten --Records of W1 One -- ---------------------------- A INSERT into' W1 'VALUES('1','w1-1','1');

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