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- Spectral_mask abstract "In telecommunications, a spectral mask, also known as a channel mask or transmission mask, is a mathematically-defined set of lines applied to the levels of radio (or optical) transmissions. The spectral mask is generally intended to reduce adjacent-channel interference by limiting excessive radiation at frequencies beyond the necessary bandwidth. Attenuation of these spurious emissions is usually done with a band-pass filter, tuned to allow through the correct center frequency of the carrier wave, as well as all necessary sidebands.The spectral mask is usually one of the things defined in a bandplan for each particular band. It is essential in assuring that a transmission stays within its channel. An FM radio station, for example, must attenuate everything beyond ±75kHz from the center frequency by a few decibels, and anything beyond ±100 kHz (the channel boundary) by much more. Emissions on further adjacent channels must be reduced to almost zero. FM broadcast subcarriers are normally required to stay under 75 kHz (and up to 100 kHz if reduced) to comply with the mask. The introduction of in-band on-channel (IBOC) digital radio in the United States has been slowed down by issues concerning the subcarriers it uses – and the corresponding increase in the amount of energy in the sidebands – overstepping the bounds of the spectral mask set forth for FM by the NRSC and enforced by the FCC. Other types of modulation have different spectral masks for the same purpose. Many digital modulation methods such as COFDM use the electromagnetic spectrum very efficiently, allowing for a very tight spectral mask. This allows placement of broadcast stations or other transmissions on channels right next to each other without interference, allowing for an increase in a band's total capacity. Conversely, it is allowing the U.S. to eliminate TV channels 52 to 69, freeing up 108 MHz (from approximately 700 to 800 MHz) for emergency services and to be auctioned off to the highest bidder, while still retaining (although moving) all existing TV stations.".
- Spectral_mask wikiPageID "1434705".
- Spectral_mask wikiPageLength "2648".
- Spectral_mask wikiPageOutDegree "42".
- Spectral_mask wikiPageRevisionID "679068713".
- Spectral_mask wikiPageWikiLink Adjacent-channel_interference.
- Spectral_mask wikiPageWikiLink Adjacent_channel.
- Spectral_mask wikiPageWikiLink Attenuation.
- Spectral_mask wikiPageWikiLink Auction.
- Spectral_mask wikiPageWikiLink Band-pass_filter.
- Spectral_mask wikiPageWikiLink Band_(radio).
- Spectral_mask wikiPageWikiLink Bandplan.
- Spectral_mask wikiPageWikiLink Bandwidth_(signal_processing).
- Spectral_mask wikiPageWikiLink COFDM.
- Spectral_mask wikiPageWikiLink Carrier_signal.
- Spectral_mask wikiPageWikiLink Carrier_wave.
- Spectral_mask wikiPageWikiLink Category:Broadcast_engineering.
- Spectral_mask wikiPageWikiLink Category:Wireless.
- Spectral_mask wikiPageWikiLink Channel_(communications).
- Spectral_mask wikiPageWikiLink Channel_capacity.
- Spectral_mask wikiPageWikiLink Decibel.
- Spectral_mask wikiPageWikiLink Digital_modulation.
- Spectral_mask wikiPageWikiLink Digital_radio.
- Spectral_mask wikiPageWikiLink Electromagnetic_spectrum.
- Spectral_mask wikiPageWikiLink Emergency_service.
- Spectral_mask wikiPageWikiLink Emergency_services.
- Spectral_mask wikiPageWikiLink FM_broadcasting.
- Spectral_mask wikiPageWikiLink Federal_Communications_Commission.
- Spectral_mask wikiPageWikiLink Frequencies.
- Spectral_mask wikiPageWikiLink Frequency.
- Spectral_mask wikiPageWikiLink Hertz.
- Spectral_mask wikiPageWikiLink In-band_on-channel.
- Spectral_mask wikiPageWikiLink KHz.
- Spectral_mask wikiPageWikiLink Line_(geometry).
- Spectral_mask wikiPageWikiLink Line_(mathematics).
- Spectral_mask wikiPageWikiLink Math.
- Spectral_mask wikiPageWikiLink Mathematics.
- Spectral_mask wikiPageWikiLink Modulation.
- Spectral_mask wikiPageWikiLink National_Radio_Systems_Committee.
- Spectral_mask wikiPageWikiLink Optical.
- Spectral_mask wikiPageWikiLink Optics.
- Spectral_mask wikiPageWikiLink Orthogonal_frequency-division_multiplexing.
- Spectral_mask wikiPageWikiLink Radiation.
- Spectral_mask wikiPageWikiLink Radio.
- Spectral_mask wikiPageWikiLink Radio_spectrum.
- Spectral_mask wikiPageWikiLink Radio_station.
- Spectral_mask wikiPageWikiLink Sideband.
- Spectral_mask wikiPageWikiLink Spurious_emission.
- Spectral_mask wikiPageWikiLink Subcarrier.
- Spectral_mask wikiPageWikiLink TV.
- Spectral_mask wikiPageWikiLink Telecommunication.
- Spectral_mask wikiPageWikiLink Telecommunications.
- Spectral_mask wikiPageWikiLink Television.
- Spectral_mask wikiPageWikiLink Transmission_(telecommunications).
- Spectral_mask wikiPageWikiLink Tuned_filter.
- Spectral_mask wikiPageWikiLink United_States.
- Spectral_mask wikiPageWikiLinkText "Spectral Emission Mask".
- Spectral_mask wikiPageWikiLinkText "Spectral mask".
- Spectral_mask wikiPageWikiLinkText "normally-defined".
- Spectral_mask wikiPageWikiLinkText "spectral mask".
- Spectral_mask wikiPageWikiLinkText "spectrum mask".
- Spectral_mask hasPhotoCollection Spectral_mask.
- Spectral_mask wikiPageUsesTemplate Template:Unreferenced.
- Spectral_mask subject Category:Broadcast_engineering.
- Spectral_mask subject Category:Wireless.
- Spectral_mask hypernym Set.
- Spectral_mask type Article.
- Spectral_mask type Article.
- Spectral_mask type Discipline.
- Spectral_mask comment "In telecommunications, a spectral mask, also known as a channel mask or transmission mask, is a mathematically-defined set of lines applied to the levels of radio (or optical) transmissions. The spectral mask is generally intended to reduce adjacent-channel interference by limiting excessive radiation at frequencies beyond the necessary bandwidth.".
- Spectral_mask label "Spectral mask".
- Spectral_mask sameAs m.0517r2.
- Spectral_mask sameAs Q7575198.
- Spectral_mask sameAs Q7575198.
- Spectral_mask wasDerivedFrom Spectral_mask?oldid=679068713.
- Spectral_mask isPrimaryTopicOf Spectral_mask.