Adaptive data compression system
First Claim
1. An adaptive data compression system comprising an encoder which converts input characters into output codewords according to a stored encoding map or table of characters and codewords stored in the encoder, adapting means which adapts the encoding map or table in accordance with the input characters so as to increase the compression ratio between the input characters and output codewords, and optimization means which monitors the computational loading of the system when converting input characters into output codewords and varies the rate at which the adapting means adapts the encoding map or table in accordance with said computational loading.
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Abstract
An adaptive data compression system comprises an encoder 2 which responds to input characters by producing output codewords according to a stored encoding map or table of characters and codewords, and an adapter 4, 5 which adapts the encoding map or table in accordance with the input characters so as to increase the compression ratio between the input characters and output codewords. An optimizer 5 monitors the performance of the system and accordingly varies adaptation of the encoding map or table by the adapter 4 so as to optimize performance of the system. Performance of the system is preferably monitored in terms of the computational loading of the processor and the compression ratio it achieves. A decoder 7 subsequently decodes the codewords by reference to a corresponding decoding map or table which is adapted 9, 10 in accordance with the output data from the decoder and in accordance with variations in the adaptation process in the encoder.
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11 Claims
- 1. An adaptive data compression system comprising an encoder which converts input characters into output codewords according to a stored encoding map or table of characters and codewords stored in the encoder, adapting means which adapts the encoding map or table in accordance with the input characters so as to increase the compression ratio between the input characters and output codewords, and optimization means which monitors the computational loading of the system when converting input characters into output codewords and varies the rate at which the adapting means adapts the encoding map or table in accordance with said computational loading.
Specification