Coded data generation or conversion – Digital code to digital code converters – To or from variable length codes
Patent
1995-12-14
1997-10-07
Deboer, Todd
Coded data generation or conversion
Digital code to digital code converters
To or from variable length codes
341 82, 348403, H03M 740
Patent
active
056753314
ABSTRACT:
A decoding device is provided including a code FIFO memory unit for sequentially storing a bit stream, a barrel shifter for shifting and then outputting codes properly, an accumulator for computing the shift amount of the barrel shifter and issuing a request to read data to the code FIFO memory unit, a DCT coefficient decoder for decoding DCT coefficients, a variable-length code decoder for decoding variable-length codes other than DCT coefficients, a fixed-length code decoder for decoding fixed-length codes, a register unit for storing decoded data, a decoding controller for controlling the decoders in accordance with the decoded data stored in the register unit and decoded data output by the decoders and a memory controller for controlling operations to store DCT coefficients in a memory unit A. The DCT coefficient decoder, the variable-length code decoder and the fixed-length code decoder are connected in parallel to the output of the barrel shifter and the memory controller is controlled by the decoding controller. By virtue of this structure, the decoding device is capable decoding a bit stream comprising variable-length codes mixed with fixed-length codes. The decoding device is also capable of changing processing of a next code in accordance with decoded codes. Further, these operations can be implemented by means of a simple and reasonable configuration. On top of that, the process of decoding codes at a required high speed is carried out by an independent circuit, allowing the processing power of the decoding circuit to be enhanced.
REFERENCES:
patent: 4509038 (1985-04-01), Hirano
patent: 5173695 (1992-12-01), Sun et al.
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patent: 5491480 (1996-02-01), Jan et al.
patent: 5502491 (1996-03-01), Sugiyana et al.
Miyo Takayuki
Mizosoe Hiroki
Oku Masuo
Shinohara Shuji
Tsuboi Yukitoshi
DeBoer Todd
Hitachi , Ltd.
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