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Feedback microphones encoder modulators, signal generators, mixers, amplifiers, summing nodes

  • US 9,384,726 B2
  • Filed: 01/11/2012
  • Issued: 07/05/2016
  • Est. Priority Date: 01/06/2012
  • Status: Active Grant
First Claim
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1. Encoder circuitry comprising:

  • A. first modulator circuitry having an analog, feedback microphone input and an analog output;

    B. first signal generator circuitry providing a first ultrasonic carrier frequency signal and having an analog output;

    C. first mixer circuitry having an analog input connected to the analog output of the first modulator circuitry, an analog input connected to the analog output of the first signal generator circuitry, and an analog output;

    D. first amplifier circuitry having an analog input connected to the analog output of the first mixer circuitry and an analog output;

    E. second modulator circuitry having an analog, feedback microphone input and an analog output;

    F. second signal generator circuitry providing a second ultrasonic carrier frequency signal having a frequency different from the frequency of the first ultrasonic carrier frequency signal and having an analog output;

    G. second mixer circuitry having an analog input connected to the analog output of the second modulator circuitry, an analog input connected to the analog output of the second signal generator circuitry, and an analog output;

    H. second amplifier circuitry having an analog input connected to the analog output of the second mixer circuitry and an analog output;

    I. a first summing node having a first input coupled to the analog output of the first amplifier circuitry, a second input coupled to the analog output of the second amplifier circuitry, and an output; and

    J. a second summing node having a third microphone input, a second input coupled to the output of the first summing node, and an output.

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