Improved instrumentation suitable for measuring aircraft noise and sonic booms is described. An electric current proportional to the sound pressure level at a condenser microphone is produced and transmitted over a cable and amplified by a zero drive amplifier. The converter consists of a local oscillator, a dual-gate field-effect transistor mixer, and a voltage regulator/impedance translator. The improvements include automatic tuning compensation against changes in static microphone capacitance and means for providing a remote electrical calibration capability.

  • Supplemental Notes:
    • Misc-Filed 1 Jul. 1975 Supersedes N75-27334 (13 - 18, p 2249). Subm-Sponsored by NASA. This Government-owned invention available for U.S. licensing and, possibly, for foreign licensing. Copy of Patent available Commissioner of Patents, Washington, D.C.
  • Corporate Authors:

    Langley Research Center

    National Aeronautics and Space Administration
    Hampton, VA  United States  23665
  • Authors:
    • Zuckerwar, A J
  • Publication Date: 1976-6-22

Media Info

  • Pagination: 8 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00145823
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: PATENT-3 964 319, PAT-APPL-592 159
  • Files: TRIS
  • Created Date: Jan 16 1977 12:00AM