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what are the weaknesses of a encoder
Garland Schimmel
Wiki User
∙ 10y agoEncoding is done to reduce the number of bit to be transmitted and save bandwidth . suppose you have 10 line and your line no 4 is active and other are low than transmit this information to another place require to send all 10 lines or bits but if you encode it than only four bits are enough and you saved 6 bits . on the receiver we can reproduce the original signal using decoder.
In addition to compression, encoding can have two other purposes: encryption and error correction.
Encoding a data set using a cipher (a mathematical process of transforming the normal text into what looks like gibberish, but which can be unscrambled back into the original text later) produces a new data set which disguises the original data's true nature. This can be used to hide the data inside another data set (stenography) or simply to make it unreadable by anyone not sharing the secret to undoing the cipher (cryptography). Encoding is the method by which this mathematical process turns the data into this cipher text. In most cases, a cipher do not noticeably change the total length of the data.
Encoding often can be used to produce redundancy in the data set, so that if a portion of the data set is lost for any reason, the encoding allows for the lost data to be reconstructed from the existing encoded data. This makes the data more robust for communication across methods which are prone to losing portions of the transmission (to interference, collision, etc.). Error correction encoding adds more information to the data stream to allow for this reconstruction; thus, adding error correction encoding ALWAYS increases the length of the data.
It is possible to include all three methods in one operation: that is, a data set can be encoded via some algorithms which compress, encrypt, and also add error correction. Each of the above are completely independent of each other.
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