12-09-2014, 03:38 PM
Blu Ray-future 0f DVD’s
Blu Ray-future.docx (Size: 212.19 KB / Downloads: 20)
ABSTRACT
Blue-ray is the name of a next-generation optical disc format jointly developed by the Blue-ray Disc Association (BDA), a group of the world's leading consumer electronics, personal computer and media manufacturers.
The format offers more than five times the storage capacity of traditional DVDs and can hold up to 25GB on a single-layer disc and 50GB on a dual-layer disc. This extra capacity combined with the use of advanced video and audio codec’s will offer consumers an unprecedented HD experience.
While current optical disc technologies such as DVD, DVD±R, DVD±RW, and DVD-RAM rely on a red laser to read and write data, the new format uses a blue-violet laser instead, hence the name Blue-ray. Blue ray also promises some added security, making ways for copyright protections.
Blue-ray discs can have a unique ID written on them to have copyright protection inside the recorded streams. Blu-ray Disc format is required by the forthcoming of High Definition TV era which calls for a brand new generation optical storage after DVD. The format is designed to have even wider disc tolerances than those of DVD.
INTRODUCTION
Blue-ray disc is a next-generation optical disc format jointly developed by a group of leading consumer electronics and PC companies called the Blu-ray Disc Association (BDA), which succeeds the Blu-ray Disc Founders (BDF). Because it uses blue lasers, which have shorter wavelengths than traditional red lasers, it can store substantially more data in the same amount of physical space as previous technologies such as DVD and CD.
A current, single-sided, standard DVD can hold 4.7 GB (gigabytes) of information. That's about the size of an average two-hour, standard-definition movie with a few extra features. But a high-definition movie, which has a much clearer image, takes up about five times more bandwidth and therefore requires a disc with about five times more storage. As TV sets and movie studios make the move to high definition, consumers are going to need playback systems with a lot more storage capacity.
What is a Blu-ray disc?
Blu-ray disc is a next-generation optical disc format jointly developed by a group of leading consumer electronics and PC companies called the Blu-ray Disc Association (BDA), which succeeds the Bluray Disc Founders (BDF). Because it uses blue lasers, which have shorter wavelengths than traditional red lasers, it can store substantially more data in the same amount of physical space as previous technologies such as DVD and CD.
A current, single-sided, standard DVD can hold 4.7 GB (gigabytes) of information. That's about the size of an average two-hour, standard-definition movie with a few extra features. But a high-definition movie, which has a much clearer image, takes up about five times more bandwidth and therefore requires a disc with about five times more storage. As TV sets and movie studios make the move to high definition, consumers are going to need playback systems with a lot more storage capacity.
The advantage to Blu-ray is the sheer amount of information it can hold
• A single-layer Blu-ray disc, which is roughly the same size as a DVD, can hold up to 27 GB of data — that's more than two hours of high-definition video or about 13 hours of standard video.
• A double-layer Blu-ray disc can store up to 54 GB, enough to hold about 4.5 hours of high-definition video or more than 20 hours of standard video. And there are even plans
Why the name Blu-ray?
The name Blu-ray is derived from the underlying technology, which utilizes a blue-violet laser to read and write data. The name is a combination of "Blue" and optical ray "Ray". According to the Blu-ray Disc Association, the spelling of "Blu-ray" is not a mistake. The character "e" is intentionally left out because a daily-used term can’t be registered as a trademark.
BLU-RAY TECHNOLOGY
The standards for 12-cm optical discs, CDs,DVDs, and Blu-ray rewritable discs (BD-RE Standard) were established in 1982, 1996, and 2002,respectively. The recording capacity required by applications was the important issue when these standards were decided (See fig 2). The requirement for CDs was 74 minutes of recording 2- channel audio signals and a capacity of about 800 MB. For DVDs, the requirement as a video disc was the recording of a movie with a length of two hours and fifteen minutes using the SD (Standard Definition) with MPEG-2 compression. The capacity was determined to be 4.7 GB considering the balance with image quality.
In the case of the Blu-ray Disc, abbreviated as BD hereafter, a recording of an HDTV digital broadcast greater than two hours is needed since the BS digital broadcast started in 2000 and terrestrial digital broadcast has begun in 2003. It was a big motivation for us to realize the recorder using the optical disc. In a DVD recorder, received and decoded video signals are compressed by an MPEG encoder and then recorded on the disc.
To record in the same fashion for an HDTV broadcast, an HDTV MPEG-2 encoder is required. However, such a device for home use has not yet been produced. In the case of BS digital broadcasts, signals are sent as a program stream at a fixed rate, which is 24 Mbps for one HDTV program. In the program stream of BS digital broadcast there is a case that the additional data stream is multiplexed, and it is desirable to record and read the data as is. Two hours of recording requires a recording capacity of 22 GB or more. This capacity is about 5
BLU-RAY v/s OTHER STORAGE DEVICES
The storage capacity of different digital storage technology varies a lot.
Usually used version of floppy disc has a capacity of 1.44MB while that of a CD is 700 MB & for DVD it is 4.7 GB. Also they have varying shell lives out of these DVD has the maximum. A DVD is very similar to a CD, but it has a much larger data capacity. A standard DVD holds about seven times more data than a CD does. This huge capacity means that a DVD has enough room to store a full-length, MPEG-2-encoded movie, as well as a lot of other information. DVD can also be used to store
almost eight hours of CD-quality music per side. DVD is composed of several layers of plastic, totaling about 1.2 millimeters thick. Each layer is created by injection molding polycarbonate plastic.
COMPARISON OF BD AND DVD
A disc in the DVD format can currently hold 4.7 gigabytes of data. Unlike DVD technology, which uses red lasers to etch data onto the disc, the Blu-raydisc?
Technology uses a blue-violet laser to record information
CONCLUSION
Today consumers are searching for faster transfer speeds and large storage capacity .These two are the most notable advantages of BD technology. So BD will be a good option for such peoples.According to the EMA (Entertainment Merchant Association) in U.S, by the end of 2012, sales of Blu-ray Discs will surpass those of standard definition storage medias , generating sales of a whopping $9.5 billion. Home video spending on the whole has been projected to grow exponentially to $25.6 billion in 2012. These shows the increasing demand for Blu-ray products. The manufacturers of Blu-ray discs are further trying to increase the number of layers in a single disc so that a four layer disc stores 100GB of data , 8 layer disc stores about 200 GB of data, likewise.