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Digital m of n correlation device having increased bit rate

  • US 4,414,641 A
  • Filed: 06/01/1981
  • Issued: 11/08/1983
  • Est. Priority Date: 06/01/1981
  • Status: Expired due to Fees
First Claim
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1. A digital correlation device for producing a voltage sum corresponding to n individual analog currents in accordance with the bits in corresponding bit positions, the n individual analog currents being indicative of the number of agreements/disagreements in the corresponding bit positions, which comprises:

  • a signal shift register including a plurality of signal multivibrators S1 -Sn arranged in a predetermined manner so as to store a binary sequence of signal data inputted at a signal input line of said signal shift register;

    a reference shift register including a plurality of reference multivibrators R1 -Rn arranged in a predetermined manner so as to store a binary sequence of reference data inputted thereto;

    a clock having one output operatively connected to said signal shift register and another output operatively connected to said reference shift register for shifting the states of the signal multivibrators S1 -Sn and the reference multivibrators R1 -Rn according to the modulation frequency of the signal data;

    a plurality of modulo 2 adders A1 -An operatively connected at each of their two inputs to the outputs of corresponding signal multivibrators S1 -Sn of said signal shift register and reference multivibrators R1 -Rn of said reference shift register for modulo 2 summing of the two bits in corresponding bit positions of said signal and said reference shift registers to provide a single bit representation of the agreements/disagreements in the corresponding bit positions; and

    a plurality of 1-bit digital-to-analog converters C1 -Cn operatively connected at one input to the corresponding output of each of said plurality of modulo 2 adders and at their outputs collectively to one end of a single analog summing resistor, the other end of said single analog summing resistor being connected to a voltage supply, said single summing resistor being an integral part of each one of said plurality of 1-bit digital-to-analog converters C1 -Cn so that they operate to convert the single bit representative of the agreements/disagreements of the n individual analog currents into the voltage sum.

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