Accession Number : ADD013547

Title :   Nonwavelength-Limited Holographic Sound Field Reconstruction.

Descriptive Note : Patent, Filed 9 Jun 81, patented 15 Nov 83,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Maynard, Julian D ; Williams, Earl G

Report Date : 15 Nov 1983

Pagination or Media Count : 11

Abstract : A method and apparatus are described for holographically generating visual representations of acoustical characteristics of sound sources. A planar array has a lattice of microphone receiving points are disposed such that evanescent wave energy from the sources is detected along with propagating wave energy. The microphone outputs are sampled, resolved into phase and amplitude components, digitized and subjected to fast Fourier transform operations to provide computer graphic display means with holographic reconstruction parameters corresponding to the sources under analysis.

Descriptors :   *ACOUSTICS, *COMPUTER GRAPHICS, *EVANESCENT WAVES, *FAST FOURIER TRANSFORMS, *SOUND GENERATORS, *WAVE PROPAGATION, AMPLITUDE, ARRAYS, ENERGY, GRAPHICS, MICROPHONES, OUTPUT, PATENTS, PLANAR STRUCTURES, VISION, PATENTS

Subject Categories : Holography
      Acoustics
      Computer Hardware
      Numerical Mathematics

Distribution Statement : APPROVED FOR PUBLIC RELEASE