Television channel
hideA television channel is a physical or virtual channel over which a television station or television network is distributed. For example, in North America, "channel 2" refers to the broadcast or cable band of 54 to 60 MHz, with carrier frequencies of 55.25 MHz for NTSC analog video (VSB) and 59.75 MHz for analog audio (FM), or 55.31 MHz for digital ATSC (8VSB). Channels may be shared by many different television stations or cable-distributed channels depending on the location and service provider.
Depending on the multinational bandplan for a given region, analog television channels are typically 6, 7, or 8 MHz in bandwidth, and therefore television channel frequencies vary as well. Channel numbering is also different. Digital television channels are the same for legacy reasons, however through multiplexing, each physical radio frequency (RF) channel can carry several digital subchannels. On satellites, each transponder normally carries one channel, however small, independent channels can be used on each transponder, with some loss of bandwidth due to the need for guard bands between unrelated transmissions. ISDB, used in Japan and Brazil, has a similar segmented mode.
Channel separation on over-the-air channels is accomplished by skipping at least one channel between two analog stations' frequency allocations. (It should be noted that there are gaps between certain channels, where numbers are sequential, but frequencies are not contiguous, such as the skip from VHF low to high, and the jump to UHF.) On cable TV, it is possible to use adjacent channels only because they are all at the same power, something which could only be done over the air if the two stations were transmitted at the same power and height from the same location. For digital TV, selectivity is inherently better, therefore channels adjacent (either to analog or digital stations) can be used even in the same area.
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News tagged with tv stations
Another 158 TV stations to kill analog early
Mar 18, 2009 |
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(AP) -- Regulators have cleared 158 TV stations around the country to shut down their analog broadcast signals before June 12, when the remaining full-power stations will end theirs.
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Stations must warn if new TV signals lack reach
Mar 16, 2009 |
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(AP) -- TV stations must alert viewers if their new digital signals don't reach areas covered by their soon-to-be-defunct analog broadcasts, the Federal Communications Commission has ruled.
Analog TV signals to be interrupted in 'soft test'
May 20, 2009 |
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(AP) -- TV stations around the country will replace their analog broadcasts for a few minutes Thursday with reminders that those broadcasts will disappear completely in three weeks.
TV stations struggling with viewer loss on DTV
Jul 02, 2009 |
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(AP) -- The government is helping two dozen TV stations that became difficult to receive by antenna when they switched to new frequencies as part of the digital TV transition, the Federal Communications Commission said Thursday.
Time Warner Cable asks help on rising program fees
Nov 25, 2009 |
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(AP) -- Time Warner Cable Inc. is asking the public for help as it tries to curtail increases in the programming fees it has to pay to carry cable channels and broadcast stations on its systems.
Reception problems linger after DTV transition
Jun 17, 2009 |
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(AP) -- The shutdown of U.S. analog TV service on Friday appears to have gone relatively smoothly, but as expected, a lot of viewers are having problems getting the stations they want.
Friday is last day to apply for digital TV coupon
Jul 30, 2009 |
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(AP) -- The government program that provides $40 coupons for digital TV converter boxes is winding down.
Digital TV is worth converter hassle
Feb 04, 2009 |
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Converter boxes. Coupon shortages. Congressional squabbling. Mass confusion. Such hassles raise a fundamental question about the digital TV transition: What will consumers get in return? Quite a lot, actually.
New Wi-Fi Technology Using White Spaces
Aug 20, 2009 |
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(PhysOrg.com) -- A wireless internet network that uses portions of the old analog TV spectrum may one day become a reality. The plans for a computer network that uses "white spaces," which are empty fragments ...
Don't change that channel: DTV woes still abound
Sep 18, 2009 |
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(AP) -- Think the digital TV transition is over? Not quite. Many viewers have found that they can't pick up certain stations after the switch, even with the right TVs or converter boxes. The stations are still trying to ...
Friday is final curtain for analog TV signals
Jun 10, 2009 |
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(AP) -- The last major TV stations that are still broadcasting in analog will turn those signals off Friday and go all digital. And this time, they really mean it.
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