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Cocke John, Mommens Jacques H, Raviv Josef: Processing of compacted data. February 20, 1973: US3717851 (79 worldwide citation)

This data processing technique utilizes compacted data in the form of variable-length codes having length-representing prefix portions which themselves are variable-length encoded. The relatively small amount of storage needed when such a code format is used enables data to be conveniently encoded a ...


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Raviv Josef: Data compaction using modified variable-length coding. International Business Machines Corporation, July 4, 1972: US3675211 (59 worldwide citation)

A three-state associative memory is employed as an encoding-decoding instrumentality for making conversions between fixed-length codes and variable-length codes. The available variable-length codes are stored in a field of the associative memory that has uniform word lengths. Memory cells which are ...


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Loh Louis S, Mommens Jacques H, Raviv Josef: Method of achieving data compaction utilizing variable-length dependent coding techniques. International Business Machines Corporation, September 26, 1972: US3694813 (52 worldwide citation)

The present invention relates to a method practiceable on a general purpose electronic computer for statistically analyzing a data set and for producing a set of encoding and decoding (E/D) tables for achieving compaction of the original data set utilizing a variable length code. The method disclose ...


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Raviv Josef, Wesley Michael A: Data compaction using variable-length coding. International Business Machines Corporation, July 4, 1972: US3675212 (40 worldwide citation)

A three-state associative memory is employed as an encoding-decoding instrumentality for making conversions between fixed-length codes and variable-length codes. During the encoding process, associations are performed upon fixed-length codes to find the corresponding variable-length codes. The short ...


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Cocke John, Mommens Jacques H, Raviv Josef: Method of and apparatus for decoding variable-length codes having length-indicating prefixes. International Business Machines Corporation, October 24, 1972: US3701111 (37 worldwide citation)

This code conversion method enables data which has been coded in the form of variable-length bit strings for data compaction purposes to be processed by hardware units of conventional design that handle data in the form of fixed-length bit strings. The coding scheme is such that in the bit string of ...


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Loh Louis S, Mommens Jacques H, Raviv Josef: Code processor for variable-length dependent codes. International Business Machines Corporation, October 24, 1972: US3701108 (27 worldwide citation)

A processor for encoding fixed-length code words into variable-length code words and for decoding variable-length code words into fixed-length code words. The fixed-length code words are assigned to a number of groups and one of several possible coding sets determined by the probability of each word ...


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McLaughlin John A, Raviv Josef: Pattern recognition apparatus and methods invariant to translation, scale change and rotation. International Business Machines Corporation, October 19, 1971: US3614736 (23 worldwide citation)

A pattern recognition system is disclosed which will recognize patterns irrespective of their translation rotation or scale change. Input data may be provided by a scanner or other suitable data source. Means for calculating the center of gravity, or alternatively the autocorrelation function are pr ...


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Raviv Josef, Wesley Michael Andrew: Code conversion apparatus. Ibm, October 11, 1972: GB1292772-A

1292772 Code conversion INTERNATIONAL BUSINESS MACHINES.CORP 28 May 1971 [10 Aug 1970 8 Sept 1970] 17819/71 Heading G4C Variable-length codes and corresponding fixed-length codes are held in a store which may be accessed in response to a given variablelength code and fixed length code to obtain the ...


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