pace2k的部落格

Free-to-air (FTA) is a possession utilised to draw small screen (TV) and radio broadcasts, which are broadcast, unencrypted and may as a consequence be picked up via any decorous receiver. The term should not be bemused beside free-to-view, which describes TV, which is acquirable short subscription, but which is encoded and may thence be closed geographically. Neither of these options can be delineate as pay-TV, which describes a payment service, which is encrypted. The term typically refers to conferral by outer television, but in diverse surroundings of the world where on earth encrypted digital physical object telecasting channels exist, tv show on UHF or VHF bands, it can as well be applied to those systems.

Although these channels are described as allowed to use, the beholder does in certainty pay for them. Some are post-free evenly by transfer of funds of a liberty fee or voluntary donation, where on earth as others are paying askance for client products and work where division of the outlay goes toward box promotion and help.

Free-to-air is in use for global medium. It can commonly be represented as television's same of shortwave radio. There are a digit of competitory systems in use, with earliest adopters having used C-band outer dishes of more feet in diam to acquire signals which were in the beginning linear FM, then digital mistreatment the Motorola-proprietary Digicipher II grouping or subsequently unmoving active to Ku-band and underneath one-metre dishes next to maximum recurrently the internationalist DVB custom. The ensuing are the types of Free-to-air Receivers:

Satellite Dish
A outer dishware is a extraordinary hue of parabolical electrical device planned next to the intention of transmitting signals to and/or unloading from satellites. A satellite plate is a singular species of nonparticulate radiation antenna, which comes in varied sizes and designs, and is supreme generally used to have outer tube.

Satellite Television
Satellite tv is telecasting delivered by way of subject area satellites, as compared to routine physical object tube and telegram tv. In oodles areas of the global outer telecasting employment expand elder earthly signals, providing a broader scope of channels and services, together with subscription-only services.

Set Top Box
The possession set-top box describes a apparatus that connects to a broadcasting and several outer basis of signal, and turns the make a gesture into content, which is past displayed on the peak. The motion rootage possibly will be an local area network cable, a satellite dish, a coaxal cable, a telephone line, Broadband all over Power Line, or even an workaday VHF or UHF electrical device. This funds any or all of video, audio, Internet webpages, interactive games, or otherwise possibilities. A set-top box does not e'er need to contain a piano tuner of its own.

A box correlated to a television set's SCART connector is fed next to the baseband television impressive from the set's tuner, and can ask the broadcasting to fair the returned processed bleeper or else. This fact is in use for coding Pay TV, and in the chivalric was in use for secret writing teletext, back decoders became intrinsical. The unreserved summon can be of the one and the same nature as the ingoing signal, or even an "insert" all over the unproved signal, thankfulness to the "fast switching" dimension of SCART whereas in satchel of Pay TV, this treatment avoids the hassles associated near having a 2d cut off rule.