Electrical computers and digital processing systems: multicomput – Computer-to-computer data modifying
Reexamination Certificate
1997-11-21
2001-04-17
An, Meng-Ai T. (Department: 2783)
Electrical computers and digital processing systems: multicomput
Computer-to-computer data modifying
C709S247000, C710S020000, C710S021000, C710S036000, C710S052000, C710S065000, C710S068000, C713S150000, C707S793000
Reexamination Certificate
active
06219716
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a system and an apparatus for compressing and expanding data, and more particularly to a system and an apparatus for compressing data, transferring the compressed data, and expanding the compressed data into original data.
2. Description of the Related Art
Heretofore, apparatus which exchange data therebetween often incorporate a system for compressing data, transferring the compressed data, and expanding the compressed data into original data in order to reduce the memory size which stores data to be transferred, reduce the amount of data to be transferred, and shorten the period of time required to transfer data.
FIG. 1
of the accompanying drawings shows a conventional data compressing and expanding system for transferring data between two apparatus
110
a,
110
b.
The apparatus
110
a,
110
b
have respective compressing units
111
a,
111
b
for compressing data to be transferred, and respective expanding units
112
a,
112
b
for expanding compressed data that have been transferred. The conventional data compressing and expanding system includes a storage
120
connected between the apparatus
110
a,
110
b
for temporarily storing transferred data. While data is shown as being transferred between the two apparatus in the conventional data compressing and expanding system, data may be transferred between a plurality of apparatus.
Data processing operation of the conventional data compressing and expanding system will be described below with reference to
FIGS. 1 and 2
of the accompanying drawings. It is assumed that data will be transferred from the apparatus
110
a
to the apparatus
110
b.
First, a string of byte data to be transferred is compressed into a compressed string of byte data by a compression processor or compression software in the compressing unit
111
a.
The compressed string of byte data is sent from the compressing unit
111
a
to the storage
120
, and temporarily stored in the storage
120
.
Thereafter, the stored compressed string of byte data is read out of the storage
120
, and transferred to the apparatus
110
b.
The compressed string of byte data may not be stored in the storage
120
, but may be transferred directly to the apparatus
110
b.
The compressed string of byte data which has been transferred to the apparatus
110
b
is expanded by an expansion processor or expansion software in the expanding unit
112
b,
thereby recovering the uncompressed string of byte data.
Most of the time required for the conventional data compressing and expanding system to transfer data is spent by compressing and expanding the data. There are limitations on efforts to reduce the time needed to compress and expand data. Since it is difficult to shorten the time required to transfer data, the time required to transfer data tends to increase if the amount of data to be transferred increases.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a system and an apparatus for compressing and expanding data to shorten a period of time required to transfer the compressed data.
According to the present invention, when data is divided into a plurality of strings of byte data by dividing means, the divided strings of byte data are concurrently compressed by compressing means and transferred from one apparatus to another apparatus. Thereafter, the strings of byte data which have been transferred are concurrently expanded by expanding means, thus restoring the uncompressed strings of byte data.
Since the divided strings of byte data are concurrently compressed and expanded, the time required to transfer the data is shortened.
The above and other objects, features, and advantages of the present invention will become apparent from the following description with references to the accompanying drawings which illustrate an example of the present invention.
REFERENCES:
patent: 4929946 (1990-05-01), O'Brien et al.
patent: 4999715 (1991-03-01), Porcellio et al.
patent: 5436732 (1995-07-01), Mikami
patent: 5535017 (1996-07-01), Hideaki
patent: 5572336 (1996-11-01), Mikami et al.
patent: 5764865 (1998-06-01), Masubuchi et al.
patent: 5805932 (1998-09-01), Kawashima et al.
patent: 5854957 (1998-12-01), Morikawa
patent: 6092071 (2000-07-01), Bolan et al.
Advantest Corporation
An Meng-Ai T.
El-Hady Nabil
Knobbe Martens Olson & Bear LLP
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