Techniques for generating modulation codes using running substitutions

    公开(公告)号:US07142134B2

    公开(公告)日:2006-11-28

    申请号:US11049554

    申请日:2005-02-01

    IPC分类号: H03M7/00 H03M13/21

    CPC分类号: H03M5/145

    摘要: Techniques are provided for performing substitutions of bit sequences that are known to cause errors. Input data is initially modulation encoded. The modulated data is then analyzed in a sliding window to determine if it contains any additional bit sequences that are known to cause errors. If an error prone bit sequence is identified in the data, a substitution engine replaces the error prone bit sequence with a predetermined pattern of bits that is less likely to cause errors. The bit stream output of the substitution engine is then recorded on a storage medium. The recorded bit stream is decoded when it read from the medium. The decoding process identifies the substituted bit pattern and replaces the substituted pattern with the original sequence of bits.