发明授权
US5696506A Apparatus for variable-length decoding image signals using a run
equivalent signal
失效
用于使用运行等效信号对可变长度解码图像信号的装置
- 专利标题: Apparatus for variable-length decoding image signals using a run equivalent signal
- 专利标题(中): 用于使用运行等效信号对可变长度解码图像信号的装置
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申请号: US436866申请日: 1995-05-08
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公开(公告)号: US5696506A公开(公告)日: 1997-12-09
- 发明人: Pil-ho Yu
- 申请人: Pil-ho Yu
- 申请人地址: KRX Kyungki-do
- 专利权人: Samsung Electronics, Co., Ltd.
- 当前专利权人: Samsung Electronics, Co., Ltd.
- 当前专利权人地址: KRX Kyungki-do
- 优先权: KRX94-9922 19940506
- 主分类号: H04N19/46
- IPC分类号: H04N19/46 ; G06T9/00 ; H03M7/40 ; H03M7/42 ; H04N1/41 ; H04N7/24 ; H04N19/00 ; H04N19/423 ; H04N19/70 ; H04N19/91 ; H04N19/93
摘要:
An apparatus for decoding variable-length codewords has a FIFO memory which stores a bitstream and outputs an N-bit sequence from the first bit position in the stored bitstream in response to a carry signal. The number of bits "N" corresponds to the longest variable-length codeword. A barrel shifter receives part of a 2N-bit sequence in response to the carry signal, and outputs an N-bit sequence in response to the accumulated codeword length. Another barrel shifter outputs an N-bit sequence in response to the codeword length for storing the 2N-bit sequence from the first barrel shifter. The decoder generates a run-length and a level corresponding to a variable-length codeword starting at a first bit position in the N-bit sequence. The decoder generates a second run equivalent signal during a run-length interval, and then outputs data of "0" in response to the second run equivalent signal, and outputs a level in response to the first run equivalent signal. A codeword length generator generates a codeword corresponding to the first variable-length codeword in the output of the second barrel shifter. An operator adds and modulo-N-operates a previously accumulated codeword length and a codeword length from the codeword length generator and outputs the residue as an accumulated codeword length and the quotient as a carry signal.
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