×

Interactive data retrieval apparatus

  • US 4,433,392 A
  • Filed: 12/11/1981
  • Issued: 02/21/1984
  • Est. Priority Date: 12/19/1980
  • Status: Expired due to Term
First Claim
Patent Images

1. An interactive data retrieval apparatus comprisinga data store to store data records,a keyboard to enable an operator to enter search key data and control data,a data processor to control the storage and retrieval of data records in said data store, andsearch means to compare search key data entered by the operator with data read from said store thereby to locate a data record within said data store, the search means including,a search store for storing said entered search key data,a data stream buffer and means for clocking successive bytes of data records forming a data stream which is read from said data store through said data stream buffer, andcomparison logic means to compare the contents of said data stream buffer within the contents of said search store and to indicate that a match has occurredwherein the improvement comprises,a plurality of comparison cells in said comparison logic means and means connecting the comparison cells to compare the contents of corresponding positions of said data stream buffer and said search store and to compare the contents of positions of said data stream buffer adjacent said corresponding positions with said corresponding positions of said search store, andlogic combination means to combine logically the outputs of predetermined groups of said comparison cells to give indictions of an exact match and matching within a predetermined distancewhen said search key data is the same as said data stream or differs from said data stream but only by a predetermined amount.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×