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Multiple sheet detector apparatus and method

  • US 7,810,716 B2
  • Filed: 04/14/2008
  • Issued: 10/12/2010
  • Est. Priority Date: 07/01/2004
  • Status: Active Grant
First Claim
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1. An article bearing processor readable instructions operative to cause at least one processor to cause at least one apparatus to carry out a method comprising:

  • a) directing a sound signal through a pathway through which sheet media moves;

    b) acquiring at least one receiver signal responsive to the sound signal, wherein at least a portion of the at least one receiver signal is produced responsive to the sound signal after having passed through the sheet media moving in the pathway;

    c) producing a first output representative of changes in phase of the at least one receiver signal relative to a first reference signal;

    d) producing a second output representative of changes in phase of the at least one receiver signal relative to a second reference signal, wherein the first and second reference signals differ in phase;

    e) acquiring a plurality of samples of the first and second outputs;

    f) comparing the samples of the first and second outputs to determine information corresponding to changes in phase of the sound signal after having passed through the sheet media;

    g) responsive to (f), moving the sheet media with at least one transport.

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