| 摘要 |
A data compression apparatus for data compressing an information signal, which is in n-level form, n being larger than 2. The data compression apparatus includes an input terminal for receiving the n-level information signal, an entropy coder, such as an arithmetic coder having an input for receiving an input signal, which is adapted to carry out a lossless encoding step on the input signal, so as to obtain a data compressed output signal at an output. The apparatus further includes a prediction filter for carrying out a prediction step on the n-level information signal so as to obtain a prediction signal and a probability signal determining unit for generating the probability signal in response to the prediction signal. An output terminal is available for supplying the data compressed output signal. Further, a data expansion apparatus is disclosed.
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