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2 edition of Spatial impulse response of an acoustic line radiator found in the catalog.

Spatial impulse response of an acoustic line radiator

Anthony J Rudgers

Spatial impulse response of an acoustic line radiator

a study of boundary-diffraction-wave phenomena and their experimental detection

by Anthony J Rudgers

  • 143 Want to read
  • 18 Currently reading

Published by [Dept. of Defense, Navy Dept., Office of Naval Research], Naval Research Laboratry in Washington .
Written in English

    Subjects:
  • Sound-waves,
  • Sound-waves -- Scattering

  • Edition Notes

    StatementAnthony J. Rudgers, Standards Branch, Underwater Sound Reference Division
    SeriesNRL report ; 8191, NRL report -- 8191
    ContributionsNaval Research Laboratory (U.S.), Naval Research Laboratory (U.S.). Underwater Sound Reference Division. Standards Branch
    The Physical Object
    Paginationiii, 208 p. :
    Number of Pages208
    ID Numbers
    Open LibraryOL14859389M

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    The result is outstanding sound resolution and fine acoustic detail, combined with impressive impulse reproduction. This provides a rounded, warm and substantial sound experience founded on an.


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Spatial impulse response of an acoustic line radiator by Anthony J Rudgers Download PDF EPUB FB2

Get this from a library. Spatial impulse response of an acoustic line radiator: a study of boundary-diffraction-wave phenomena and their experimental detection. [Anthony J Rudgers; Naval Research Laboratory (U.S.); Naval Research Laboratory (U.S.). Underwater Sound.

A method is developed to accurately determine the spatial impulse response at the specifically discretized observation points in the radiated field of 1-D linear ultrasonic phased array.

For the purpose of a pure 2-D setup, the spatial impulse response of a curved-line transducer is derived and compared to the response function of a cylindrically focused aperture of negligible.

Since the sphere is radiating into free space, where there are no reflections, we take the outward going part of the solution to the spherical wave equation () given by Eq.

(), where p ˜ + is an Spatial impulse response of an acoustic line radiator book coefficient to be determined from the boundary conditions. Let us Spatial impulse response of an acoustic line radiator book impose a boundary condition at the surface of the sphere whereby the particle velocity normal to the surface.

the impulse response method: A line impulse response approach. The Journal of the Acoustical Society of America, 76(1)–, [15] G Scarano, N Denisenko, M Matteucci, and M Pappalardo.

A new approach to the derivation of the impulse response of a rectangular piston. The Journal of the Acoustical Society of America, 78(3)– Author: Jason Zalev, Michael C. Kolios. Response widening with increasing D/l is marginal and on-axis nulls are not observed. But the increase in 6 dB/oct on-axis slope and a dominant peak agree with observations and required equalization.

See Chapter 13 in the recent book by Beranek & Mellow, "Acoustics - Sound Fields and Transducers", Elsevier-Academic Press ().

H The symbol for henry, a measure of inductance. h Plank's constant, × joules-sec. Haas Effect Also called the precedence effect, describes the human psychoacoustic phenomena of correctly identifying the direction of a sound source heard in both ears but arriving at different to the head's geometry (two ears spaced apart, separated by a barrier) the direct sound.

The free field response is equalized in each configuration to be flat over the frequency range of interest. Steady-state transfer function. The steady-state response at the listening position for a radiator in a room may be measured with a sine wave sweep or calculated from the measured impulse response.

Specifically, the name for the destructive interference pattern that develops when a radiator is located one-quarter wavelength away from a reflective surface; after Roy F. Allison, American acoustic engineer of AR (Acoustic Research) and Allison Acoustics fame, who first wrote of this effect in his paper, "The Influence of Room Boundaries on.

In interpreting this result, it should be noted that the ideal impulse response is a delta function at the focal point in the spatial domain. In the spatial frequency domain, this Spatial impulse response of an acoustic line radiator book to a constant phase on the focal plane.

As noted above, this is approximately achieved at the focus of an infinite radius, unapodized, focused : Renée K. Warriner, Richard S.C. Cobbold. INDEX A acceleration 15 Acoustic Lever–, –, Acoustical Ohms 90 alignments armature (see motor, variable relut-ance) array line, – microphone – spherical Spatial impulse response of an acoustic line radiator book, auditory system – inner ear middle ear organ of Corti outer ear autocorrelation 22 B.

where p r, (z MI) is the attenuated (ie, derated) peak-rarefactional acoustic pressure at the depth z MI (assuming an attenuation coefficient Spatial impulse response of an acoustic line radiator book of dB cm −1 MHz −1); z MI is depth on the beam axis from the transducer to the plane of maximum attenuated pulse-intensity integral (pii ); and f awf is the acoustic-working frequency.

In a survey conducted by the FDA and others of Cited by: The hardware and software realization methods have been discussed. At the same time, the acoustic signal acquisition performance and impulse response of acoustic signal output module have been measured.

The results show that the acquisition sensitivity is 86 mV/Pa, the output response is changed by different loudspeakers. If you ain’t got that rhythm Join Our Community Subscribe to Paul's Posts.

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Now, if a sound source is off to one side of the spaced pair, then the direct sound will arrive at one microphone before the other and therefore cause an interchannel time difference using distance as our delay line. In this case, the closer the sound source is to 90 ∘ to one side of the pair, the greater the time difference, with a maximum.

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The converged impulse responses of the adaptive filters provide information about the amplitude of the reflected waves and their arrival times at the surface, thus allowing detection of the reflecting horizons and their location and physical characteristics.

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