Electronic instrument for locating and diagnosing engine sounds

  • US 5,445,026 A
  • Filed: 06/14/1993
  • Issued: 08/29/1995
  • Est. Priority Date: 06/14/1993
  • Status: Expired due to Term
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First Claim
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1. An acoustic signal and sound diagnostic instrument for discriminating audible automotive engine and industrial machinery abnormalities for use by a professional maintenance operator comprising:

  • a) an elongated deformable, semi-rigid probe arm bearing an acoustic transducer microphone at the forward end thereof for detecting and converting audible acoustic signals and sounds having a frequency in the range of from about 500 to about 10,000 Hz into electromagnetic signals;

    b) an electronics housing conformed to be held in the hand of said maintenance operator, said housing mechanically connected to and supporting said probe arm at the rearward end thereof;

    c) pre-amplifier circuitry within said housing electrically coupled to said transducer microphone for receiving said electromagnetic signals from said microphone;

    d) range selector circuitry within said housing for selecting sound level ranges respecting said electromagnetic signals;

    e) a decibel meter mounted to the exterior of said housing and electrically interconnected to said pre-amplifier circuitry for visually indicating changes and peaks in the sound levels detected by said transducer microphone;

    f) operational audio amplifier circuitry within said housing electrically interconnected to said pre-amplifier circuitry for converting said electromagnetic signals into secondary audible acoustic signals;

    g) a battery power supply electrically interconnected to said range selector circuitry and said pre-amplifier circuitry for energizing said instrument; and

    h) an earphone headset electrically interconnected to said audio amplifier circuitry for use by said operator whereby said secondary audible acoustic signals are available to said operator for audible discrimination of engine and machinery abnormalities.

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