how to calculate decibels

Learn about it: In terms of voice, how does one calculate the bandwidth consumed by codec?By default, after the analog voice is converted to a digital voice, it is cut in 20 ms segments for 20 ms segments, encapsulated with RTP, and then wrapped with UDP header, IP header, finally, the packet header of Layer 2 is sent out. Suppose we use g.729 encoding and transmit it over Ethernet. Calculate the ban

Similar_text-calculate the similarity between two stringsInt similar_text (string $ first, string $ second [, float $ percent])$ First is required. Specifies the first string to be compared.$ Second is required. Specifies the second string to be compared.$ Percent is optional. Specifies the name of the variable that stores the percentage similarity.The similarity between the two strings is calculated based on the description of Oliver [1993. Note tha

Share PHP to calculate the number of days between two dates code, This example describes how PHP calculates the two-day difference between days. Share to everyone for your reference. The implementation method is as follows: ';p Rint_r (_date_diff (Strtotime ($date), Time ()), Echo '';?> I hope this article will help you learn PHP programming. Articles you may be interested in: PHP calculates two date time difference (returns year, month, day)

Section 6 use MATLAB to calculate the Determinant The basic unit of mathematical software processing is matrix ). MATLAB is the abbreviation of "Matrix Laboratory. In practical application, when the number of computing elements is large and the order is large, it is very simple to use MATLAB. The method is as follows: Calculate the Determinant First, assign a value to matrix A. The command is: > A =

Time limit:1000/1000 MS (java/others) Memory limit:32768/32768 K (java/others)See this time, I confused ...Sure enough, Java is to hit the table, can not AC, because Java input is a stream, it takes more time than C really much longer ....Problem DescriptionYou just need to calculate the sum of the formula:1^2+3^2+5^2+......+ n ^2.InputIn each case, the there is an odd positive integer n.OutputPrint the sum. Make sure the sum would not exceed 2^31-1Sa

Java uses LocalDate to calculate the age based on the date. javalocaldate There are many classes that are directly related to dates in Java. Commonly Used classes are Date and Calendar under java. util package. java. text. SimpleDateFormat is also used when the format is used. First of all, it is awkward to use Date and Calendar. I am not familiar with it at the beginning. I cannot tell the specific usage and difference of Date and Calendar classes. I

Calculate the actual length of GBK and UTF8 strings implemented by JavaScript The main purpose is to match the length range of the database. For example, if a field in the GBK database is varchar (10), the length is equivalent to five Chinese characters, and one Chinese character is equal to the length of two letters. For UTF8 databases, the length of each Chinese character is 3. After learning the above principles, we can

Use the Jquery selector to calculate the total of a row in a column in the table. The Jquery selector is used to calculate a column in a table. It is very convenient to calculate the total of a row. The following uses the calculated row sum as an example: Core algorithms: $('#tableId tr').each(function() { $(this).find('td:eq(columnIndex)').each(function() { tota

Many times we need to calculate the execution time of the PHP script to learn about the efficiency of the script, and so on. For example, there is a large section of PHP script, we need a fragment to get the script execution time method. First introduce the function to be used:Timing functionsfunction runtime ($mode = 0) {Static $t;if (! $mode) {$t = Microtime ();Return}$t 1 = microtime ();List ($m 0, $s 0) = Split ("", $t);List ($m 1, $s 1) = Split (

original articles, welcome reprint. Reprint Please specify: Dongsheng's blog Calculated Properties instead of storing the data itself, the data is computed from other storage properties. Calculate Attribute Concepts:the computed property provides a Getter (accessor) to get the value, and an optional Setter (set accessor) to indirectly set the value of another property or variable. The syntax format for the computed attribute is as follows:Object-orien

answer is true, and the analysis of other numbers is the same. From this we can obtain that we need a function (that is, the setAll () of the following code) to calculate the total number of possibilities of a certain number smaller than the current number, and then accumulate + 1 as the expected result, see the code implementation:Copy codeThe Code is as follows:// Function: Obtain the probability of each bit. If it is another number, it is smaller

I want to use post to achieve the length of video hanging. Can I ask how to calculate the length of video hanging on a general video website? Can I use post to handle the length of video hanging on a general video website? how can I calculate how long you have been suspended? Can I use post to hook up? Reply content: I want to use post to achieve the length of video hanging. I want to ask how to

{Code...} Why can't I calculate, $ ccc-1? The key is an array. Why can't I calculate $ ccc-1? The key is an array. Reply content: Why can't I calculate $ ccc-1? The key is an array. You haven't used smarty for a long time, do you?$ CccIs 0 Locate the positive solution. Use section,$ Foo [bar]This is only available in the {section} loop syntax, not for

14: Calculate the factorial of n less than 10000, And the factorial of 141000014: Calculate the factorial of n less than 10000 View Submit Statistics Question Total time limit: 5000 ms Memory limit: 655360kB Description Calculate the factorial of n less than 10000. Input Only one line of input, integer

Example of how to calculate the sliding distance of a touch event on a JS mobile phone, jstouch This article describes how to calculate the sliding distance of a JS Mobile Phone touch event. We will share this with you for your reference. The details are as follows: Calculate the sliding distance of a gesture on the mobile phone screen. The Code is as follows: Fu

Python uses gensim to calculate document similarity, Pre_file.py #-*-Coding: UTF-8-*-import MySQLdbimport MySQLdb as mdbimport OS, sys, stringimport jiebaimport codecsreload (sys) sys. setdefaultencoding ('utf-8') # connect to the database try: conn = mdb. connect (host = '2017. 0.0.1 ', user = 'root', passwd = 'kongjunlil', db = 'test1', charset = 'utf8') failed t Exception, e: print e sys. exit () # obtain the cursor object operation database cursor

Today we will talk about how to calculate the complexity of time.The concept of Time complexity: (Baidu version)The same problem can be solved by different algorithms, and the quality of an algorithm will affect the efficiency of the algorithm and even the program.The purpose of the algorithm analysis is to select the suitable algorithm and the improved algorithm.In computer science, the time complexity of the algorithm is a function, which quantitati

Calculate the volume of the table Difficulty level: A; running time limit: 1000 ms; running space limit: KB; code length limit: B Question description You can find the volume of the table by knowing the area of the bottom and the height of the table. Given the area and height of the upper and lower sides of the table are S1, S2, and h respectively, write a program to calculate and

Recently and a few friends, chatting to concurrency and server stress issues. Many friends, do not know how to calculate concurrency?　How many servers are appropriate to deploy? So, let's talk about it today. PV and concurrency, as well as how to calculate the number of Web servers. These are their own ideas plus some online summary, if not, welcome to shoot bricks.Several conceptsWebsite traffic refers to

TurnIt's not difficult to understand, but it's practical.The core formula is the following:(1)1. Introduction of Baidu Encyclopedia:Levenshtein distance, also known as the editing distance, refers to the minimum number of edit operations required between two strings, converted from one to another.Permission edits include replacing one character with another character, inserting a character, and deleting a character.The algorithm of editing distance is first put forward by Russian scientist Leven