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    • 17. 发明授权
    • Data transmitting apparatus, data recording apparatus, data transmitting
method, and data recording method
    • 数据发送装置,数据记录装置,数据发送方法和数据记录方法
    • US5894588A
    • 1999-04-13
    • US905812
    • 1997-08-04
    • Tetsuji KawashimaTatsuya Inokuchi
    • Tetsuji KawashimaTatsuya Inokuchi
    • H03M7/30H03M7/48G06F3/023
    • H03M7/3088H03M7/48
    • A difference/compression ratio calculating means 76 in a data processing means 71 of a data transmitting apparatus according to the present invention calculates an actual difference and an actual compression ratio based on the data length of pre-compression data received from a data source 2 through pre-compression data receiving means 74 and the data length of compressed data outputted from a data compression circuit 67. If the actual difference is equal to or greater than a preset difference .alpha. and the actual compression ratio is equal to and greater than a preset compression ratio .beta., then the compressed data is transmitted to a data destination 3 through a transfer request data output means 79. Otherwise, the pre-compression data is transmitted to the data destination 3. With this arrangement, it is possible to prevent a phenomenon in which the size of compressed data which occupies a storage area in the data destination 3 is substantially the same as the size of uncompressed data which occupies the storage area, and also to avoid wasteful data expansion in the data destination 3.
    • 根据本发明的数据发送装置的数据处理装置71中的差分/压缩比计算装置76基于从数据源2接收的预压缩数据的数据长度来计算实际差和实际压缩比, 预压缩数据接收装置74以及从数据压缩电路67输出的压缩数据的数据长度。如果实际差异等于或大于预设差值α,并且实际压缩比等于或大于预设压缩 比率β,则通过传送请求数据输出装置79将压缩数据发送到数据目的地3.否则,将预压缩数据发送到数据目的地3.通过这种布置,可以防止 占据数据目的地3中的存储区域的压缩数据的大小与未压缩的大小基本相同 占用存储区域的数据,并避免数据目的地的浪费数据扩展3。
    • 18. 发明授权
    • System for transmitting compressed data if compression ratio is at least
preset ratio and pre-compressed data if compression ratio is less than
preset ratio
    • 如果压缩比至少为预设比例,则传送压缩数据的系统和压缩比小于预设比率的预压缩数据
    • US5805932A
    • 1998-09-08
    • US564144
    • 1996-02-13
    • Tetsuji KawashimaTatsuya Inokuchi
    • Tetsuji KawashimaTatsuya Inokuchi
    • H03M7/30H03M7/48G06F3/00
    • H03M7/3088H03M7/48
    • A difference/compression ratio calculating means 76 in a data processing means 71 of a data transmitting apparatus according to the present invention calculates an actual difference and an actual compression ratio based on the data length of pre-compression data received from a data source 2 through pre-compression data receiving means 74 and the data length of compressed data outputted from a data compression circuit 67. If the actual difference is equal to or greater than a preset difference .alpha. and the actual compression ratio is equal to and greater than a preset compression ratio .beta., then the compressed data is transmitted to a data destination 3 through a transfer request data output means 79. Otherwise, the pre-compression data is transmitted to the data destination 3. With this arrangement, it is possible to prevent a phenomenon in which the size of compressed data which occupies a storage area in the data destination 3 is substantially the same as the size of uncompressed data which occupies the storage area, and also to avoid wasteful data expansion in the data destination 3.
    • PCT No.PCT / JP95 / 00795 Sec。 371日期1996年2月13日 102(e)日期1996年2月13日PCT 1995年4月21日PCT PCT。 公开号WO95 / 29437 日期:1995年11月2日根据本发明的数据发送装置的数据处理装置71中的差分/压缩比计算装置76基于从...接收的预压缩数据的数据长度来计算实际差和实际压缩比 通过预压缩数据接收装置74的数据源2和从数据压缩电路67输出的压缩数据的数据长度。如果实际差异等于或大于预设差值α,实际压缩比等于和 大于预设压缩比β,则通过传送请求数据输出装置79将压缩数据发送到数据目的地3.否则,预压缩数据被发送到数据目的地3.通过这种安排, 为了防止占用数据目的地3中的存储区域的压缩数据的大小与siz大致相同的现象 e的占用存储区域的未压缩数据,以及避免在数据目的地3浪费数据扩展。