In order to know the meaning of the term decoder, it is necessary, first of all, to discover its etymological origin. In this case, we can establish that it comes from the word “decode”, which derives from Latin and is the result of the sum of three clearly differentiated parts:
-The prefix “de-”, which indicates “from top to bottom”.
-The noun “codex”, which can be translated as “record” or “code”.
-The verb “facere”, which is synonymous with “do”.
The concept of decoder , which can also be mentioned as decoder , refers to that which decodes (or decodes). The verb decode, for its part, refers to the reverse application of the rules of a code to a message that is encoded with the objective of reaching its original form.
The notion is usually linked to a device that allows decoding. A decoder, in this sense, is a circuit that accepts coded inputs and activates the corresponding outputs according to the code in question.
When we talk about decoders we can establish that, currently, there are three important types of satellite decoders such as: ITPV decoders, 4K decoders and DTT decoders.
Take the case of a decoder that receives a digital input encoded in a binary manner . This device can activate different outputs, according to the code that was applied to the input. A 3-bit code, for example, has 3 inputs and 8 possible combinations. Each combination activates only one output: the decoder accepts an input with a certain binary code and then activates the corresponding output.
It is easy to understand how a decoder works if we think about the devices used in televisions . These decoders receive an encoded signal that is emitted via fiber optics or satellite. This signal cannot be seen on any television: a decoder capable of decoding the code is needed to make it visible. In this way, when the decoder receives the signal (input), it decodes it and makes it visible (output) on the television to which it is connected.
It is common for some TV signals to be transmitted encoded so that only those people who have a decoder and pay the corresponding subscription can see them.
When buying a satellite decoder, you must take into account a series of requirements such as the brand that endorses it, the type of decoder it is, that it is compatible with new technologies, that it has at least one USB input. and that it has a price that is in line with the money that can be spent and that is in line with market prices.
In the same way, you must pay attention to the functions that the aforementioned device performs, such as recording or programming a program, and the accessories with which it comes.
The playback quality, the image display options, whether or not it has a remote control and even the type of connection it offers are also aspects to take into account.