Electrical Engineering

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  • Inventor(s):
    James L. Massey
    Patent Number:
    US 3402393
    Description:

    Digital error correcting coding techniques involving the sensing of conditions under which the decoder is operating. In one aspect a monitoring device counts the ones in the decoding decision and in certain parity checks corrected by those decisions. In another aspect the code is supplemented such that one actual decoding error can create a number of apparent errors or ones, which enables early detection of conditions beyond the capability of the decoder. In another aspect fades are detected …

    Date Issued:
    1968-09-17
    Resource Type
    Patent
  • Inventor(s):
    James L. Massey
    Patent Number:
    US 3429334
    Description:

    Device for correcting or detecting errors in transmission of signal information, having an information signal memory, an adder for forming redundancy signals from connections between the adder and the memory in accordance with a convolutional code, the device constructed to enable backward or forward decoding of the message.

    Date Issued:
    1969-04-15
    Resource Type
    Patent
  • Inventor(s):
    James L. Massey
    Patent Number:
    US 3303333
    Description:

    This invention relates to methods of and aparatus for processing signal information and, more particularly, to the correcting and/or detecting of signal errors or other changes, as produced in transmission.

    Date Issued:
    1967-02-07
    Resource Type
    Patent
  • Inventor(s):
    James L. Massey
    Patent Number:
    US 3566352
    Description:

    Error correction in convolutionally coded messages, using a plurality of information digit streams and a single parity digital stream with each information digit being included as a component in the defining summation for exactly two parity digits spaced apart by a certain number of time intervals (a time interval being defined to include a digit from each stream), the time interval spacing between the two parity digits being the same for each information digit in a given stream but different…

    Date Issued:
    1971-02-23
    Resource Type
    Patent
  • Inventor(s):
    James L. Massey
    Patent Number:
    US 3500320
    Description:

    Bursts of errors in convolutionally coded messages are corrected by a decoder in which a parity checking circuit determines whether selected syndrome digits which lie within the constraint length of the code form a codeword in a linear block code having as its codewords the set of all patterns of said selected syndrome digits that are consistent with any error burst pattern confined to the beginning of said constraint length and upon the presence of such a codeword, error detecting and correc…

    Date Issued:
    1970-03-10
    Resource Type
    Patent