Coded data generation or conversion – Digital code to digital code converters – To or from differential codes
Patent
1997-12-22
1999-12-07
Young, Brian
Coded data generation or conversion
Digital code to digital code converters
To or from differential codes
382241, H03M 730, G06K 936
Patent
active
059991127
ABSTRACT:
In the data compression method and apparatus, difference value data each consisting of m bits that include an absolute value represented by m-1 bits and a 1-bit sign bit representing a sign are received, each of the difference value data having been obtained by calculating a difference between data to be coded and data immediately preceding it. N of the received difference value data are rearranged on a bit-by-bit basis, to generate a bit sequence in which bits at the same place of the n difference value data appear consecutively in predetermined order. A coded bit sequence is generated by compressing the generated bit sequence by a predetermined compression method. In the data expansion apparatus and method, a bit sequence of consecutive bits is generated by expanding a coded bit sequence by a decoding method corresponding to a predetermined compression method. Difference value data each consisting of m bits that include an absolute value represented by m-1 bits and a 1-bit sign bit representing a sign are restored from the expanded second bit sequence, and restored data is generated by performing, using the sign bit, an operation on data to be restored and data that has been restored immediately before it.
Jean Pierre Peguy
Sony Corporation
Young Brian
LandOfFree
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