In broadcasting, digital subchannels are a method of transmitting more than one independent program stream simultaneously from the same digital radio or television station on the same radio frequency channel. This is done by using data compression techniques to reduce the size of each individual program stream, and multiplexing to combine them into a single signal. The practice is sometimes called "multicasting".
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👉 Digital subchannel in the context of WWL-TV
WWL-TV (channel 4) is a television station in New Orleans, Louisiana, United States, affiliated with CBS. It is owned by Tegna Inc. alongside Slidell-licensed MyNetworkTV affiliate WUPL (channel 54). The two stations share studios on Rampart Street in the historic French Quarter district; WWL-TV's transmitter is located on Cooper Road in Terrytown, Louisiana.
WWL-TV formerly served as the CBS affiliate of record for the Gulf Coast region of Mississippi, until ABC affiliate WLOX (channel 13) in Biloxi launched a CBS-affiliated digital subchannel in 2012.
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Digital subchannel in the context of Television channel
A television channel, or TV channel, is a terrestrial frequency or allocated number over which a television station or television network is distributed. For example, in North America, channel 2 refers to the terrestrial 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 terrestrial television channels are the same as their analog predecessors 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 multiple small, independent channels can be on one 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.
Digital subchannel in the context of Sinclair Broadcast Group
Sinclair, Inc., doing business as Sinclair Broadcast Group, is a publicly traded American telecommunications conglomerate that is controlled by the descendants of company founder Julian Sinclair Smith. Headquartered in the Baltimore suburb of Cockeysville, Maryland, the company is the second-largest television station operator in the United States by number of stations after Nexstar Media Group, owning or operating 193 stations across the country in over 100 markets, covering 40% of American households.
Sinclair is the largest owner of stations that are affiliated with Fox, NBC, CBS, ABC, MyNetworkTV, The CW, and The CW Plus. Sinclair owns four digital multicast networks, Comet, Charge!, The Nest, and Roar, and the sports-oriented cable network Tennis Channel. In June 2021, Sinclair became a Fortune 500 company, having reached 2020 annual revenues of US$5.9 billion, equivalent to $7 billion in 2024.
Digital subchannel in the context of List of NPR stations
The following is a list of full-power non-commercial educational radio stations in the United States broadcasting programming from National Public Radio (NPR), which can be sorted by their call signs, frequencies, band, city of license and state. HD Radio subchannels and low-power translators are not included.