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Multiple correlations in a touch sensor

  • US 9,927,922 B2
  • Filed: 03/02/2017
  • Issued: 03/27/2018
  • Est. Priority Date: 06/23/2015
  • Status: Active Grant
First Claim
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1. A computing device, comprising:

  • a logic machine; and

    a storage machine holding instructions executable by the logic machine to;

    establish a first reference sequence with which to correlate signals received at one or more receive columns to touch detection conditions;

    starting with a first set of candidate reference sequences each differing from the first reference sequence, reduce the first set of candidate reference sequences by applying a rule set to the first set to derive a relatively smaller second set of candidate reference sequences;

    for each candidate reference sequence in the second set of candidate reference sequences, calculate a touch detection performance score of a combined reference sequence, the combined reference sequence being a sum of the first reference sequence and at least the candidate reference sequence for which the calculating is performed; and

    configure at least a portion of a receive circuit to correlate signals received at one or more of the receive columns to at least one of the touch detection conditions by using the first reference sequence in a combined correlation operation with at least a selected candidate reference sequence from the second set of candidate reference sequences, the selected candidate reference sequence being selected based on a corresponding touch detection performance score.

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