Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data in specific format
Patent
1995-08-11
1997-10-21
Tran, Thang V.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data in specific format
360 53, 386112, G11B 509
Patent
active
056802668
ABSTRACT:
A method for allocating and restoring a bit-stream when the code amount of the bit-stream, generated as a result of variable-length encoding with respect to macro blocks included in a segment, exceeds an allowable segment capacity. The excess bit amount is maintained at its maximum in a range where compatibility with a conventional standard definition video cassette recorder (SD-VCR) is guaranteed, to thereby improve the quality of a reproduced image. The method for allocating the bit-stream includes steps for (a) allocating the bit-stream of each DCT block, generated as a result of quantizing and variable-length encoding the DCT coefficient of each DCT block, to DCT block within the macro block, (b) reallocating the bits remaining after step (a) to another DCT block within macro block, (c) reallocating the bits remaining after step (b) to another macro block within the segment, (d) reallocating the bits remaining after step (c) to another segment having the macro block of the same content as that of previous or following frame. In this method for allocating the bit-stream, when a remaining bit amount in a segment unit is generated, the remaining bit amount is propagated to an adjacent segment and is recorded therein so that deterioration of the reproduced screen can be prevented. A data compressing/decompressing apparatus suitable for performing the above-described method is also described.
REFERENCES:
patent: 5473479 (1995-12-01), Takakura
Faber Alan
Samsung Electronics Co,. Ltd.
Tran Thang V.
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