Method and apparatus for data compression and restoration

Details Method and apparatus for data compression and restoration Method and apparatus for data compression and restoration

1996-03-20

1998-03-17

Young, Brian K.

Coded data generation or conversion

Digital code to digital code converters

Adaptive coding

H03M 700

Patent

active

057292230

ABSTRACT:
An apparatus (900) for performing the steps of data compression and data expansion. Where the steps of compression of use a modulo arithmetic unit (915) for identifying matching blocks of data that are offset from each other by a multiple of N. A matching block of data is compressed by the apparatus (900) by replacing it with an escape sequence representing the size and offset of the matching block of data. The apparatus (900) identifies a least used data value for use as an escape character to identify the escape sequence. The apparatus (900) performs data expansion by identifying escape sequences and locating an expanded block of data that matches the data represented by the escape sequence by multiplying the offset represented in the escape character by N to specify the offset to the expanded block of data.

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