发明名称 |
VARIABLE LENGTH CODING METHOD |
摘要 |
<p>PURPOSE:To always execute efficient variable length coding under various conditions. CONSTITUTION:A pattern received by a run-level pattern conversion section 9 is converted into a run-level pattern representing number of patterns whose quantization level is 0 and succeeding number of values other than 0 as one set and information (EOB) representing remaining quantization levels are all zero. Then a counter 12 counts total number of generated patterns and a counter 13 counts number of EOB information sets for each block and the results are respectively stored in memories 14, 15. A code table decision section 16 calculates a ratio e=m/n of number of times of EOB information sets (m) to total generated pattern number (n) of plural blocks coded already in the vicinity of a coding object block and selects any of coding tables 1-8 generated by a pattern generation probability distribution according to the predetermined selection rule based on the ratio. A variable length coding section 10 uses the selected code table to apply variable length coding to a pattern from the pattern conversion section 9.</p> |
申请公布号 |
JPH06232765(A) |
申请公布日期 |
1994.08.19 |
申请号 |
JP19930018690 |
申请日期 |
1993.02.05 |
申请人 |
NIPPON TELEGR & TELEPH CORP <NTT> |
发明人 |
KAMIKURA KAZUTO;ARISAWA MASAKAZU |
分类号 |
H03M7/42;G06T9/00;H04N1/41;H04N19/13;H04N19/134;H04N19/196;H04N19/423;H04N19/50;H04N19/503;H04N19/60;H04N19/61;H04N19/625;H04N19/91;(IPC1-7):H03M7/42;G06F15/66;H04N7/137;H04N7/133 |
主分类号 |
H03M7/42 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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