Encoder, decoder and method

摘要

An encoder (20) for encoding data (D1, 10) to generate corresponding encoded data (D2, 30) is provided, wherein the encoded data (D2, 30) includes information indicative of a frequency, probability or range of one or more symbols to be represented in the encoded data (D2, 30). The encoder (20) is operable to include in the encoded data (D2, 30) additional information indicative of whether or not information indicative of a frequency, probability or range for at least one symbol amongst the one or more symbols is included in the encoded data (D2, 30). The encoder (20) is operable to include in the encoded data (D3, 30) the additional information of whether or not information indicative of a frequency, probability or range for at least one symbol amongst the one or more symbols is included in the encoded data (D2, 30) expressed as single availability bit information. Beneficially, the encoder (20) is operable to represent inclusion of information indicative of the frequency, probability or range information in the encoded data (D2, 30) by use of a single availability bit value 1, and non-inclusion of information indicative of the frequency, probability or range information in the encoded data (D2, 30) by use of a single availability bit value 0.