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System and method for heterodyning an ultrasonic signal

  • US 6,707,762 B1
  • Filed: 11/12/2002
  • Issued: 03/16/2004
  • Est. Priority Date: 11/12/2002
  • Status: Active Grant
First Claim
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1. An apparatus for processing an ultrasonic signal, comprising:

  • a pre-amplifier stage for amplifying a signal from an ultrasonic detector to produce an output;

    a first heterodyning stage operatively coupled to receive the amplified output signal of the pre-amplifier stage, said first heterodyning stage converting the amplified output signal of the pre-amplifier stage into a first lower frequency signal suitable for driving a meter, said first lower frequency signal having a certain dynamic range and bandwidth;

    a second heterodyning stage operatively coupled to receive the output of the pre-amplifier stage, said second heterodyning stage converting the amplified output signal of the pre-amplifier stage into a second lower frequency signal which is in the audible range; and

    a feedback loop from the output to the input of the second heterodyning stage, said feedback loop acting to lower the dynamic range and broaden the bandwidth of the output of the second heterodyning stage with respect to the first heterodyning stage.

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