Television – Bandwidth reduction system – Data rate reduction
Patent
1996-07-23
1997-12-30
Chin, Tommy P.
Television
Bandwidth reduction system
Data rate reduction
348405, 348409, H04N 712
Patent
active
057036527
ABSTRACT:
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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patent: 5488482 (1996-01-01), Ueda et al.
patent: 5534931 (1996-07-01), Kondo
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Fujimori Yasuhiro
Kawaguchi Kunio
Kondo Tetsujiro
Takahashi Kenji
Chin Tommy P.
Frommer William S.
Lee Y.
Sinderbrand Alvin
Sony Corporation
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