Báo cáo tiếng anh chuyên ngành CNTT: Compact Disc

* INTRODUCING ABOUT DISC Teacher: Nguyen Minh Phuong. Group 4: o Truong Truong Vi Lam o Ta Thanh Chung o Tran Van Tu o Vu Van Tai o Vu Thanh Nam o Le Duyen Tinh C l i c k i c o n t o a d d p i c t u r e  Definition  History  Structure  Funtion  Kind * COMPACT DISC * DEFINITION * The compact disc was the first digital medium designed for the consumer market and has become the most popular medium for commercial releases * A Compact Disc (CD) is an optical disc used to store digital data, originally developed for storing digital audio. * The CD remains the standard physical medium for commercial audio recordings. * It is a small, portable, round medium made of molded polymer (close in size to the floppy disk) for electronically recording, storing * HISTORY * The compact disc, now commonplace in stereos and computers, was invented in the late 1960s by James T. Russell. * Starting in the mid 1980's, compact discs (CD) began to take over both the audio and computer program market.Originally designed and developed by both Sony and Phillips * HISTORY * In 1982: Manufacturing of CDs began on a large scale in factorys. * In 1984 both companies extended the technology so it can be used to store and retrieve data an so the CD-ROM was born. Since then, the compact disc has change significantly the way we listen music and store data. * In 1990 again Philips and Sony expand the technology and created the Recordable compact disc (CD- R). Up to then, the CDs were manufactured by industrial stamping with a master made from the original. * HISTORY * Nowaday, CD is very popular in our life. And I think it’ll continually develop in future. * STRUCTURE * Physical CD is like a thick plastic material made of approximately 0.25 inches (1.2 mm) with a layer of transparent polycarbonate. * CD is a single track (Track) spiral to store data, this track spiral direction round the disc continuously from the outside. * In fact, the spiral track starts in the middle, which means that CD may be smaller than 4.8 inches in size. So there are some types of plastic cards such as Business Card can be read by CD Player. A CD Business Card is about 2 MB non-spiral groove. * STRUCTURE * On the CD, the track size is very small width of about 0.5 micron and the grooves are separated by an approximately 1.6 micron. * With such dimensions, but if the total length of the spiral track on a CD would be a staggering figure of about 5 km. * Data structure * The smallest entity in a CD is called a frame, which consists of 33 bytes and contains six complete 16-bit stereo samples (two bytes × two channels × six samples = 24 bytes). The other nine bytes consist of eight CIRC error-correction bytes and one subcode byte, used for control and display. * Each byte is translated into a 14-bit word using eight-to-fourteen modulation, which alternates with three-bit merging words. In total there are 33 × (14 + 3) = 561 bits. A 27-bit unique synchronization word is added, so that the number of bits in a frame totals 588 (which are decoded to only 192 bits music). * Data structure * These 588-bit frames are in turn grouped into sectors. Each sector contains 98 frames, totaling 98 × 24 = 2352 bytes of music. The CD is played at a speed of 75 sectors per second, which results in 176,400 bytes per second. Divided by two channels and two bytes per sample, this results in a sample rate of 44,100 samples per second. [...]... launched digitally in a Compact Disc They were store more *CD R and CD RW *CD R (Compact Disc - ReadOnly) –audio and storage CD RW (Compact Disc *written more than once - Rewritable)- these are CDs on which data can be written, erased and re- *A CD PLAYER *A Compact Disc player (often written as compact disc player), or CD player, is an electronic device that plays audio Compact Discs CD players are often... on DVD players and CD-ROM/DVD-ROM based game consoles *Read a CD by CD player *The compact disc, although appearing to be stationary in the tutorial, should actually be envisioned as rotating at high speed A beam is emitted by the laser and directed onto a single track on the disc by the prism/beamsplitter As the disc rotates, the beam encounters a series of pits and landings that determine whether... mixed mode discs) Each track can in turn have up to 100 indexes, though players which handle this feature are rarely found outside of pro audio, particularly radio broadcasting The vast majority of songs are recorded under index 1, with the pre-gap being index 0 Sometimes hidden tracks are placed at the end of the last track of the disc, often using index 2 or 3 * This is also the case with some discs offering... which we want to introduce with you Those’re not all, but we hope we’ll give you some useful informations about CD * Now, let’s discover! We have some kinds of CD : oCD text oCD Graphics oCD Rom oVideo CD oPhoto CD oCD R oCD WR oCD-i, Enhanced CD…and else… *CD text *Compact Disc that allows for the storage of information like song name, artist, album name as text along with the standard audio data on... of plastic (not illustrated) on the disc before striking the reflective coating that contains pits and landings *As the disc rotates, light reflected from landings on the disk strikes the photo sensor producing a series of electrical pulses that are coordinated with a timing circuit to generate a stream of 1s and 0s that produce the binary code of information on the disc *At the bottom of the tutorial,... also gives users the creational labels functions LightScribe technology requires three factors: DRW-2014 L1T burner, colored discs and LightScribecompatible program that allows discs with LightScribe labeling After the data has been written to disk, the user simply flip the disc to record images and characters to make labels - creating a professional label * QUIE TRACK TECHNOLOGY *QuieTrack innovative... will look how CDs CD drives work *CDs take, as well as what theatfuture holds and this technology We will also look at the different forms for *FUNCTIONS (CD) is small, medium made of polymer to * A compact discrecording,a storing,portable, roundback audio, video,moldedand other (close in size in the floppy disk) for electronically and playing text, information digital form Tape cartridges and CDs generally... 0s that produce the binary code of information on the disc *At the bottom of the tutorial, a simulated bit reader continuously streams the binary code as it is retrieved from the disc *The technology used on the current disc AFFM Flextra LinkTM Flextra SpeedTM  AVRS  Light Scribe Quie Track Ultra DMA2 I.B.S I – Burn I – Speed VRS & Ultra Design *AFFM TECHNOLOGY *This technology is changing... are everywhere these days Whether they are used to *software, they have become the standard medium for distributing large hold music,ofdata or computer quantities information in a reliable package Compact discs are so easy and cheap to produce that America Online sends out millions of them every year to entice new users And if you have a computer and CD-R drive, you can create your own CDs, including...*Data structure *For CD-ROM data discs, the physical frame and sector sizes are the same Since error concealment cannot be applied to non-audio data in case the CIRC error correction fails to recover the user data, a third layer of error . * INTRODUCING ABOUT DISC Teacher: Nguyen Minh Phuong. Group 4: o Truong Truong Vi Lam o Ta Thanh Chung o Tran Van Tu o Vu Van Tai o Vu Thanh Nam o Le. (which are decoded to only 192 bits music). * Data structure * These 588-bit frames are in turn grouped into sectors. Each sector contains 98 frames, totaling 98 × 24 = 2352 bytes of music. The