Citizendia
Your Ad Here

Multiple MPEG programs are combined then sent to a transmitting antenna. In the US broadcast digital TV system, an ATSC receiver then decodes the TS and displays it on a TV.
Multiple MPEG programs are combined then sent to a transmitting antenna. MPEG-2 is a standard for "the generic coding of moving pictures and associated audio information" In the US broadcast digital TV system, an ATSC receiver then decodes the TS and displays it on a TV.

An ATSC tuner, often called an ATSC receiver or HDTV tuner, allows reception of ATSC digital television (DTV) signals broadcast over-the-air by TV stations in North America and South Korea. Digital television (DTV is the sending and receiving of moving images and sound by discrete ( digital) signals in contrast to the analog signals used by Digital broadcasting is the practice of using digital data rather than analogue waveforms to carry broadcasts over television channels or assigned radio frequency bands The term television channel generally refers to either a Television station or its cable / satellite counterpart (both outlined below Such tuners may be integrated into the television, VCR, digital video recorder, and set-top box which provides audio/video output-connectors of various types. Television ( TV) is a widely used Telecommunication medium for sending ( Broadcasting) and receiving moving Images, either monochromatic PLEASE BEAR IN MIND THAT THIS IS A GENERAL ARTICLE ABOUT VCRs/VIDEOCASSETTE RECORDERS A digital video recorder ( DVR) or personal video recorder ( PVR) is a device that records video in a digital format to a Disk drive or other A set-top box (STB or set-top unit (STU is a device that connects to a Television and an external source of signal, turning the signal into

Contents

Technical overview

The terms "tuner" and "receiver" are used loosely, and it is perhaps more appropriately called an ATSC receiver, with the tuner being part of the receiver (see Metonymy). In Rhetoric, metonymy (mɨˈtɒnɨmi is the use of a word for a concept or object associated with the concept/object originally denoted by the word The receiver generates the audio and video (AV) signals needed for television, and performs the following tasks: demodulation, error correction, transport stream demultiplexing, decompression, AV synchronization, and media reformatting to match what is optimal input for one's TV. Demodulation is the act of removing the Modulation from an analog signal to get the original Baseband signal back In Mathematics, Computer science, Telecommunication, and Information theory, error detection and correction has great practical importance in Transport stream ( TS, TP, MPEG-TS, or M2T) is a Communications protocol for audio, video, and data For multiplexing in electronics and signal processing see Multiplexer. Audio to video synchronization (also known as Audio video sync, Audio/video sync, AV-sync, lip sync &ndash or lack of it lip sync error Examples of media reformatting include: interlace to progressive scan or vice versa, picture resolutions, aspect ratio conversions (16:9 to or from 4:3), frame rate conversion, even scaling. For the method of incrementally displaying Raster graphics, see Interlace (bitmaps. Progressive or noninterlaced scanning is a method for displaying storing or transmitting Moving images in which all the lines of each frame are drawn in The aspect ratio of an Image is its width divided by its height Frame rate, or frame frequency, is the measurement of the Frequency (rate at which an imaging device produces unique consecutive images called frames The In computer graphics image scaling is the process of resizing a Digital image. Zooming is an example of resolution change. It is commonly used to convert a low-resolution picture to a high-resolution display.

How an ATSC Tuner Works

An ATSC tuner works by generating audio and video signals that are picked up from over-the-air TV broadcasts. ATSC tuners provide the following functions: demodulation, transport stream demultiplexing, decompression, error correction, analog-to-digital conversion, AV synchronization and media reformatting to fit the specific type of TV screen optimally.

Demodulation

Demodulation means that the signal that is pulled off the airways is transformed into a usable signal that a TV set can use to produce quality images and sound. Demodulation is the act of removing the Modulation from an analog signal to get the original Baseband signal back

Transport Stream Demultiplexing

In the US, multiple digital signals are combined and then transmitted from one antenna source to create over the air broadcasts. For multiplexing in electronics and signal processing see Multiplexer. An ATSC receiver then is able to decode the transport stream and display it on a TV set. Transport stream ( TS, TP, MPEG-TS, or M2T) is a Communications protocol for audio, video, and data

Decompression

Since digital signals that are broadcast over the air are compressed (packed smaller), once they are received by the ATSC tuner, these compressed packets of digital data are then unpacked to their original size, or using the proper term, decompressed.

Error Correction

Error correction is a technology that is used by the ATSC tuner to make sure that any data that is missing can be corrected. In Mathematics, Computer science, Telecommunication, and Information theory, error detection and correction has great practical importance in For instance, sometimes interference or a poor-quality signal will cause the loss of data information that the ATSC tuner receives. With error correction, the tuner has the ability to perform a number of checks and repair data so that a signal can be viewed on a TV set.

AV Synchronization

AV synchronization is the coordination of audio and video signals being displayed on a digital TV in proper time. Lip-sync or Lip-synch (short for lip Synchronization) is a technical term for matching lip movements with voice AV synchronization ensures that the audio does not lag behind the video that is being displayed on the TV set or vice versa, so that both audio and video are in sync.

Media Reformatting

Media reformatting is extremely important because the formatting of images on TV sets differs significantly according to the technology employed. For instance, some televisions have an interlaced picture, whereas others have a progressive-scan picture. For the method of incrementally displaying Raster graphics, see Interlace (bitmaps. Progressive or noninterlaced scanning is a method for displaying storing or transmitting Moving images in which all the lines of each frame are drawn in

Different televisions have a different aspect ratio. The aspect ratio of a Shape is the ratio of its longer Dimension to its shorter dimension

U. S Government mandates

The FCC has issued the following mandates for devices entering the US:[1][2][3]

It should be noted that devices manufactured before these dates can still be sold without a built-in ATSC DTV tuner.

The current regulations are specified in the U. S. Code of Federal Regulations (CFR). The Code of Federal Regulations (CFR is the codification of the general and permanent rules and regulations (sometimes called administrative law) published in the [4]

Analog TV broadcast switch-off

In early 2006 the Deficit Reduction Act of 2005[5] became law, which calls for full power over-the-air television stations to cease their analog broadcasts by February 17, 2009[6] (this cut-off date had been moved several times previously). The Deficit Reduction Act of 2005 ( is a United States budget Act of Congress. Terrestrial television is a term which refers to modes of television broadcasting which do not involve satellite transmission A television station is a type of broadcast station that broadcasts both audio and Video to Television receivers in a particular area Events 1500 - Battle of Hemmingstedt. 1600 - Philosopher Giordano Bruno is burned alive at Campo de' Fiori This article is about the year For the film see 2009 Lost Memories. Following that date, TVs and other equipment with legacy NTSC tuners would be unable to receive over-the-air broadcasts. NTSC ( National Television System Committee) is the Analog television system used in the United States, Canada, Japan, Mexico

The US switch-off will make millions of non-Cable and non-Satellite connected TV sets to "go dark". Viewers who do not upgrade, either to a television with a digital tuner or a set-top box, will end up losing their only source of television. A Congressional bill has authorized subsidizing converter boxes in a way that would allow viewers to receive the new digital broadcasts on their old TVs. A set-top box (STB or set-top unit (STU is a device that connects to a Television and an external source of signal, turning the signal into

The final plan[7] is to make two $40 coupons available from January 1, 2008 through March 31, 2009 for all households with the initial $990 million allocated, after which an additional $510 million in coupons will be available for each household that relies exclusively on over-the-air television reception. New Year See also New Year The Ancient Romans began their consular year on January 1st since 153 BC 2008 ( MMVIII) is the current year in accordance with the Gregorian calendar, a Leap year that started on Tuesday of the Common Events 307 - After divorcing his wife Minervina, Constantine marries Fausta, the daughter of the retired Roman Emperor This article is about the year For the film see 2009 Lost Memories.

In Canada, the Canadian Radio-television and Telecommunications Commission (CRTC), has set August 31, 2011 as the date that over-the-air analog TV transmission service will cease in most parts of the country except in parts of the far North. Country to "Dominion of Canada" or "Canadian Federation" or anything else please read the Talk Page CRTC may also stand for Cathode Ray Tube Controller. Canadian Radio-television and Telecommunications Commission ( CRTC, in French Conseil Events 1056 - Byzantine Empress Theodora becomes ill dying suddenly a few days later without children to succeed the Throne 2011 ( MMXI) will be a Common year starting on Saturday of the Gregorian calendar. [8] [9] But unlike the United States, there is currently no plan to provide ATSC receivers at a discount to low-income households as of January 1, 2007.

References

  1. ^ FCC INTRODUCES PHASE-IN PLAN FOR DTV TUNERS (PDF). FCC (2002-08-08). See also 2002 (disambiguation Year 2002 ( MMII) was a Common year starting on Tuesday of the Gregorian calendar. Events 1220 - Sweden is defeated by Estonian tribes in the Battle of Lihula. Retrieved on 2006-06-05. Year 2006 ( MMVI) was a Common year starting on Sunday of the Gregorian calendar. Events 70 - Titus and his Roman Legions breach the middle wall of Jerusalem in the Siege of Jerusalem
  2. ^ Requirements for Digital Television Receiving Capability (PDF). FCC (2005-11-08). Year 2005 ( MMV) was a Common year starting on Saturday (link displays full calendar of the Gregorian calendar. Events 1519 - Hernán Cortés enters Tenochtitlán and Aztec ruler Moctezuma welcomes him with great a Celebration Retrieved on 2006-06-05. Year 2006 ( MMVI) was a Common year starting on Sunday of the Gregorian calendar. Events 70 - Titus and his Roman Legions breach the middle wall of Jerusalem in the Siege of Jerusalem
  3. ^ FCC Moves Up DTV Tuner Date, Broadens Scope. TWICE (2005-11-21). Year 2005 ( MMV) was a Common year starting on Saturday (link displays full calendar of the Gregorian calendar. Events 164 BC - Judas Maccabaeus, son of Mattathias of the Hasmonean family restores the Temple in Jerusalem. Retrieved on 2006-08-30. Year 2006 ( MMVI) was a Common year starting on Sunday of the Gregorian calendar. Events 1363 - Beginning date of the Battle of Lake Poyang; the forces of two Chinese rebel leaders— Chen Youliang and
  4. ^ CFR Title 47: Telecommunication; PART 15—RADIO FREQUENCY DEVICES; § 15.117 TV broadcast receivers (PDF). FCC (2006-10-01). Year 2006 ( MMVI) was a Common year starting on Sunday of the Gregorian calendar. Events 331 BC - Alexander the Great defeats Darius III of Persia in the Battle of Gaugamela. Retrieved on 2007-02-11. Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century. Events 660 BC - Traditional founding date of Japan by Emperor Jimmu.
  5. ^ Pub. L. No. 109-171, 120 Stat. 4 (Feb. 8, 2006).
  6. ^ Senate approves 2009 for end of analog TV. MSNBC (2005-11-04). Year 2005 ( MMV) was a Common year starting on Saturday (link displays full calendar of the Gregorian calendar. Events 1333 - Flood of the Arno River, causing massive damage in Florence as recorded by the Florentine chronicler Giovanni Villani Retrieved on 2006-06-05. Year 2006 ( MMVI) was a Common year starting on Sunday of the Gregorian calendar. Events 70 - Titus and his Roman Legions breach the middle wall of Jerusalem in the Siege of Jerusalem Section 3002 of the Act amends 47 U. S. C. section 309(j)(14) to provide for the February 17, 2009 deadline.
  7. ^ Commerce Department Issues Final Rule To Launch Digital-to-Analog Converter Box Coupon Program. NTIA (2007-03-12). The National Telecommunications and Information Administration ( NTIA) is an agency of the United States Department of Commerce that serves as the President Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century. Events 538 - Witiges, king of the Ostrogoths ends his siege of Rome and retreats to Ravenna, leaving Retrieved on 2007-03-12. Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century. Events 538 - Witiges, king of the Ostrogoths ends his siege of Rome and retreats to Ravenna, leaving
  8. ^ Canadian Radio-television and Telecommunications Commission (2007-05-17). CRTC may also stand for Cathode Ray Tube Controller. Canadian Radio-television and Telecommunications Commission ( CRTC, in French Conseil Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century. Events 1521 - Edward Stafford 3rd Duke of Buckingham, is executed for Treason. "The Commission establishes a new approach for Canadian conventional television". Press release. A news release, media release, press release or press statement is a written or recorded Communication directed at members of the News Retrieved on 2007-05-17. Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century. Events 1521 - Edward Stafford 3rd Duke of Buckingham, is executed for Treason.
  9. ^ Broadcasting Public Notice CRTC 2007-53 (HTML). Sections 50 to 80. Canadian Radio-television and Telecommunications Commission (2007-05-17). CRTC may also stand for Cathode Ray Tube Controller. Canadian Radio-television and Telecommunications Commission ( CRTC, in French Conseil Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century. Events 1521 - Edward Stafford 3rd Duke of Buckingham, is executed for Treason. Retrieved on 2007-05-17. Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century. Events 1521 - Edward Stafford 3rd Duke of Buckingham, is executed for Treason.

See also

External links

© 2009 citizendia.org; parts available under the terms of GNU Free Documentation License, from http://en.wikipedia.org
 Dapyx Software network: MP3 Explorer | Ebook Manager | Zenithic