发明名称 |
Information signal encoding apparatus, encoding method thereof, information signal decoding method, and information signal record medium thereof |
摘要 |
An input digital information signal is prediction-encoded and thereby difference signals are generated. The difference signals are block segmented. A maximum value and a minimum value of each block are detected. Whether or not the range of levels of the maximum value MAX and the minimum value MIN crosses 0, a mode determining circuit 5 determines a quantizing mode and generates a mode signal MODE that represents the determined quantizing mode. When the range of the levels crosses 0, a first quantizing mode is selected. Otherwise, a second quantizing mode is selected. In the first quantizing mode, the quantizing circuit 6 performs the normal quantizing process. In the second quantizing mode, the quantizing circuit 6 performs a code conversion in such a manner that the number of bits of quantized output data is smaller than that of the normal quantizing process.
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申请公布号 |
US5966179(A) |
申请公布日期 |
1999.10.12 |
申请号 |
US19970831225 |
申请日期 |
1997.04.02 |
申请人 |
SONY CORPORATION |
发明人 |
KONDO, TETSUJIRO;FUJIMORI, YASUHIRO;TAKAHASHI, KENJI;KAWAGUCHI, KUNIO |
分类号 |
G06T9/00;H04N7/26;(IPC1-7):H04N7/12 |
主分类号 |
G06T9/00 |
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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