Blue Ray Technology - An Abstract

New technology is now making it possible for viewers to record and store high definition programming onto DVDs. Blu-ray Disc is one method of recording HD content onto an optical disc. A blue-laser optical disc (MPEG-2 or MPEG-4) is used. Systems that use this technology will be able to play traditional DVDs, but the goal of Blu-ray is to create an image that's as close to the HD format as possible. The name Blu-ray comes from the blue laser that decodes and copies information to each disk. Blu-ray technology may very well revolutionize the world of high definition programming. The Blu-ray disc format offers greater potential for storage, usually 25 gigabytes, which exceeds that of a standard DVD (15 gigabytes). One single-layer Blu-ray disk can hold about four hours of high definition content. A two-layer disk can contain eight hours of HD content. Four- and eight-layer disks are now in the works. These disks would have storage capabilities of 100 and 200 gigabytes. The Blu-ray recording system utilizes a shorter wavelength for recording information than traditional CDs and DVDs, and this is part of what allows it to hold more content on a single disk.

Flexible Circuits - Advantages and Applications

Flexible electronics is a technology for assembling electronic circuits by mounting electronic devices on flexible high performance plastic substrates, such as polyimide. This post is about flexible electronics circuits advantages of flexible boards, and its emerging applications.

Disadvantages Of HDTV

In the previous post, we discussed about HDTV and its advantages. But there are some issues - disadvantages with HDTV.

• To be able to receive HD content, you need to have an HD-ready TV set or TV set with built-in HDTV tuner, which is comparatively expensive. Also, traditional SD programmes originally filmed in the standard 4:3 ratio, when seen on an HDTV monitor, will have empty margins to the left and right of the image because 16:9 wide-screen aspect ratio is the standard for digital HDTV. You can choose to fill this unused display area by stretching the SD shows horizontally to fill the screen, but this will only distort the image.

• Normally, the HDTV transmission is provided through satellite and the same may not be available on free basis. In such a case, you may be required to subscribe to HDTV with the service provider.

• HDMI, or component video cables, must be used to support high-definition signals. HDMI is an all-digital connection that allows both HD audio and video to pass through a single cable. If you use older video cabling standards like com-posite or S-Video for connections from a cable box or satellite dish, you will get only an SDTV-quality picture.

• Another drawback of HDTV is that most of the operators do not fully follow HDTV specifications. So the HD picture quality is usually not as good as promised. Operators tend to use slower bitrates or lower resolution to accommodate more channels within the limited bandwidth, which reduces the video quality.

• While on an analogue TV, the interference causes the picture to slowly deteriorate from bad to worse,
  interference in HDTV broadcast will freeze, skip, or display ‘garbage’ information.

What all is required for HDTV reception?

You may ask “Do I need a special TV to be able to see HDTV?” The answer is that only high-definition televisions can display HD content in the HD resolution. Enhanced-definition televisions can display HD content in a 480p resolution, which is DVD quality. All other televisions that are analogue of standard digital will not be able to display HD content in an HD resolution because they lack the technology to do so.

Sources of HDTV Signals

Therefore HDTV has the highest level resolution offered within the digital TV category. We can also infer that HD is digital, but not all digital TV is HD. HDTV has a 16:9 aspect ratio, which is the same as that of a movie
theater screen. This post describes the sources of High defenition TV signals. 

Working of Touch Screen Mobiles

• What is the working principle behind touchscreen mobiles?
• How do they differ from ordinary mobiles?
• What are their drawbacks?

This post is intended to answer these kind of questions that usually arises in user minds.Mobile phones may use two types of input devices. In regular mobile phones, a keypad type of device is used, which is mounted separately from the screen of the cellphone. Whereas in touchscreen cellphones, a touch screen is a cellphone display screen that also acts as an input device. The touchscreens are sensitive to pressure; a user interacts with the mobile applications by touching pictures or words on the screen.