What is DTV?
Digital television (DTV) is a new type of broadcast system that replaces traditional analog broadcasting. From the consumer's point of view, the DTV has two instant benefits: it provides better resolution for a clearer picture and offers a wider screen for viewing for a theater experience. If there is a disadvantage of DTV, it may be an understandable confusion surrounding technology with many formats and overlapping abbreviations. For example, DTV also refers to digital TV files or sets designed to display digital TV signals.
DTV can come in various flavors or resolutions. The resolution is determined by the number of pixels or dots that make up the only video of the video. DTV gives a selection of broadcasts and digital TVs are able to view these options directly, or by converting the signal to the highest resolution that the set is able to display.
If you want to understand how the resolution works, consider a video camera that captures the footage one frame at a time at 30 frames per second (FPS).Each images are then rasterized or processed into small dots called pixels. Each pixel carries its own information about shade and brightness, so they reconstruct the framework when they are removed as a whole. In order to ensure that the analog TV correctly align the pixel series, the horizontal and vertical synchronized signals are combined with a refirized video to create a video signal composite .
This data -intensive signal is transmitted using radio waves, with a sound broadcast separately. Analog TV receives audio and video broadcasts and reconstructs a composite video signal using 525 vertical pixels, poor resolution according to modern standards. (Displaying your computer set to the lowest possible resolution uses 640 vertical pixel lines.) Broadcasting needed digital facelift to improve resolution, less consumedzones.
DTV can transmit video information in the digital language of those and zeros. This data can then be compressed by the encoding diagram known as MPEG2, which allows broadcasting to choose how they would like to encode each program or what resolution to use. Elections include Standard Resolution (SDTV) or High Resolution (HDTV). DTV is therefore not always high resolution. SDTV is roughly equal to analog TV, although SDTV provides excellent image thanks to digital technology.
Due to the different possible formats in the DTV, not all TVs that are digital TV can display all DTV formats. Some digital TVs are unable to display HDTV and must construct these broadcasts to lower resolution. On the contrary, HDTV produced to display the highest resolution must increase all programs that are transmitted in lower resolutions.
Digital resolution is named after the number of vertical pixel lines that the program was coded. They are the following: 480i/P (SDTV), 720i/P (HDTV) and 1080i (HDTV). "I" means interlaced scanning and "p" for progressive scanning. In the interlaced image, half of the screen updates every 60 second, then the second half, so it updates the entire framework 30 times per second. In progressive scanning, the entire frame is updated every time it is passing, creating a picture without flashing.
Some top digital TVs offer a native 1080p resolution, although nothing is broadcast in 1080p because it requires too much bandwidth. Instead, these TVs internally process 1080i broadcasts before displaying, determining the frames to stream the image 1080p on the screen.
You may wonder why the network would decide to broadcast in lower resolution. Broadcasting in 1080i consumes all available bandwidth for a particular channel, while lower resolution leaves space for more towing or broadcasting on sub -channels within the same frequency band. This can be used for seconds to flowData for providing interactive television, additional information, such as menu guides or even more programming options. Because not every type of show requires or is even best for 1080i broadcasting, DTV opens us with many new possibilities.
programs that are well suitable for 1080i include films, many types of documents and travel protocols. Sport is broadcast in 720p because progressive scan keeps fast movement and pelvis with camera. The network could decide to broadcast news, game or talk show in SDTV to create space for more towing.
Finally, unlike an analog TV with a 4: 3 aspect ratio, DTV uses the 16: 9 aspect ratio reminiscent of a rectangular film screen. For all these reasons, the transition from analog to DTV is globally. In the United States, June 12, 2009 is the end of analog broadcast. Canada set the date of 31 August 2011 and in the European Union is already in some regions with Jinmates after the lawsuit.
Analog TV can display DTV signals using a digital box converter. In the US, the government provides coupons on the website of the TV Converter Box Coupón program to subsidize purchases for citizens who qualify.