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Output sequences: {v} = V = {v, v_iV},

in case of Information codc (variable-lcngth codę), length of noisc/output sequcnce is

tlie same as length of the transmitted codeword, /j, = k,; i = 1.....K,

in case of error control codę, n, -n \ i = 1,..., N.

Decoder decision (codewordsafter channcl decoder):    {^w }= {^w} •

A codę is uniquely decodable if for any source sequence of the length L:    a

sequence of codę words corresponding to that sequence:    is different from a

sequence of codc words corresponding to any other source sequence:    . Only

uniqucly decodable codcs arc of practical mcaning!