TAILIEUCHUNG - Multimedia cho Joomla part 12

Một yếu tố quan trọng của Internet là những công cụ chúng tôi sử dụng để tương tác với nó. Các máy tính cá nhân hiện nay là một bộ phần mềm đa phương tiện, cung cấp ghi âm thanh mạnh mẽ và khả năng phát lại rằng hãng chuyên gia chỉ được sử dụng để truy cập vào. | Chapter 5 An important element of the Internet is the tools we use to interact with it. The personal computer is now a multimedia suite offering powerful audio recording and playback capabilities that only specialist studios used to have access to. With computer screens being a visual medium the use of audio is a perfect delivery medium for those who are sight impaired and web audio has been a solution to the delivery of information for people with certain disabilities Hiisten to a message from the author. A HREF IMG SRC ALT Sound file Let s work together for accessibility. Listen to a message from the author. A If the audio file contains lots of information then you might want to link to a file that contains a complete transcript Let s listen to an excerpt from The Walrus and the Carpenter by Lewis Carroll. Audio transcript Excerpt from The Walrus and the Carpenter by Lewis Carroll. Man The time has come the Walrus said To talk of many things Of shoes- and ships- and sealing-wax- Of cabbages-and kings- And why the sea is boiling hot- And whether pigs have wings. The previous image is taken from http . It displays an accessible approach for an audio excerpt within a web page. Audio formats Just like video hundreds of audio formats exist for recording and playing back digital sound and music files. Many of these are software dependant requiring a specific program to play that particular file. These formats are not of much use when trying to provide audio to the widest possible audience so we will be narrowing the choices down to a few well-known and well-supported formats that are suitable for web use. Before we look at the choices of file types to use it is important to mention that audio is data-intensive medium that has seen amazing developments in the way in which it is compressed and stored. This data crunching is performed using audio codecs. The word Codec stands for compression decompression which is the process that happens to

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