Entropy encoder/decoder
AssigneeSony Corporation
InventorsAkihisa Koyama, Yasushi Nishi
Life of this patent
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Abstract
An EBCOT codec (1) is provided which includes a bit modeling unit (11), arithmetic codec (12), input FIFO memory (13), output FIFO memory (14) and a controller (16). The input and output FIFO memories (13) and (14) have a function to control the bit length of to-be-stored data correspondingly to that of supplied data. For the coding, the input FIFO memory (13) is supplied with a wavelet transform coefficient of 16 bits, and for the decoding, it is supplied with a code data of 8 bits. For the coding, the output FIFO memory (14) outputs 8-bit code data, and for the decoding, it outputs wavelet transform coefficients of 16 bits. Thus, the circuit scale can be reduced and data transfer speed be improved.
Claims4
An entropy encoder/decoder comprising:
- an input FIFO (first-in first-out) memory to provisionally hold supplied data and output data held therein in their supplied order;
- an output FIFO memory to provisionally hold supplied data and output data held therein in their supplied order;
- a bit modeling means for making a bit modeling;
- an arithmetic coding/decoding means for making an arithmetic coding and effecting the arithmetic coding reversely;
- and
- a control means for controlling a number of data bits held in each of the input and output FIFO memories.
Dependencies are inferred from the claim text.