by [Dept. of Defense, Navy Dept., Office of Naval Research], Naval Research Laboratry in Washington .
Written in English
|Statement||Anthony J. Rudgers, Standards Branch, Underwater Sound Reference Division|
|Series||NRL report ; 8191, NRL report -- 8191|
|Contributions||Naval Research Laboratory (U.S.), Naval Research Laboratory (U.S.). Underwater Sound Reference Division. Standards Branch|
|The Physical Object|
|Pagination||iii, 208 p. :|
|Number of Pages||208|
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 unknown coefficient to be determined from the boundary conditions. Let us now 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)–,  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. 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 corresponds 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 , 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 [α] 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. Ma by Paul McGowan. We judge our stereo system’s performance by a long list of criteria. There’s tonal balance, imaging, dynamics (both micro and macro), soundstaging, top end, bottom end, midrange bloom, noise levels, and of course pacing and rhythm.