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Wall compliance and violin cavity modes.

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Ingia / Ingia

Violin corpus wall compliance, which has a substantial effect on cavity mode frequencies, was added to Shaw's two-degree-of-freedom (2DOF) network model for A0 ("main air") and A1 (lowest length mode included in "main wood") cavity modes. The 2DOF model predicts a V(-0.25) volume dependence for A0

Structural acoustics model of the violin radiativity profile.

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Ingia / Ingia

Violin radiativity profiles are dominated by the Helmholtz-like A0 cavity mode ( approximately 280 Hz), first corpus bending modes B1(-) and B1(+) ( approximately 500 Hz), and BH and bridge-filter peaks ( approximately 2.4 kHz and approximately 3.5 kHz, respectively), with falloff above

Violin f-hole contribution to far-field radiation via patch near-field acoustical holography.

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Ingia / Ingia

The violin radiates either from dual ports (f-holes) or via surface motion of the corpus (top+ribs+back), with no clear delineation between these sources. Combining "patch" near-field acoustical holography over just the f-hole region of a violin with far-field radiativity measurements over a sphere,

Parametric plate-bridge dynamic filter model of violin radiativity.

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Ingia / Ingia

A hybrid, deterministic-statistical, parametric "dynamic filter" model of the violin's radiativity profile [characterized by an averaged-over-sphere, mean-square radiativity (R(ω)(2))] is developed based on the premise that acoustic radiation depends on (1) how strongly it vibrates [characterized by

Modal analysis of a violin octet.

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Ingia / Ingia

Experimental modal analysis of a complete Hutchins-Schelleng violin octet, combined with cavity mode analysis and room-averaged acoustic analysis, gives a highly detailed characterization of the dynamics for this historic group of instruments. All the "signature" modes in the open string pitch

Musical instrument recordings made with a fiber Fabry-Perot cavity: photonic guitar pickup.

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Ingia / Ingia

A 1 cm long, low-finesse fiber-optic cavity was used as a transducer for the vibrations of the soundboard of an acoustic guitar and of a violin. The reflected light is detected and then amplified and recorded using conventional audio instrumentation. The fiber-optic pickup is found to have a high

Structural acoustics of good and bad violins.

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Ingia / Ingia

Modal-acoustic radiation measurements on 17 "bad-to-excellent" quality-rated violins--including three-dimensional modal analyses of Titian and Willemotte Stradivari and Plowden Guarneri del Gesu violins to investigate extensional as well as flexural motions-were examined for quality-related trends,

The evolution of air resonance power efficiency in the violin and its ancestors.

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Ingia / Ingia

The fact that acoustic radiation from a violin at air-cavity resonance is monopolar and can be determined by pure volume change is used to help explain related aspects of violin design evolution. By determining the acoustic conductance of arbitrarily shaped sound holes, it is found that air flow at

The violin heart.

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Ingia / Ingia

Left ventricular false tendons are thin, fibromuscular structures which traverse the left ventricular cavity. They are thought to be intracavitary radiations of the bundle of His. Usually these tendons span between the interventricular septum and the lateral wall or a papillary muscle. They have

[Fitz-Hugh-Curtis syndrome: 2 patients with perihepatitis and sepsis].

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Ingia / Ingia

Two women aged 53 and 22 years presented with abdominal pain and signs of sepsis with metabolic acidosis. The first patient had ecchymoses all over her body, the second patient had an enlarged left kidney with wedge-shaped hypo-intense areas on the CT scan. The clinical condition of both women

Experimental study of AO and T1 modes of the concert harp.

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Ingia / Ingia

String instruments are usually composed of a set of strings, a soundboard, and a soundbox with sound holes, which is generally designed to increase the sound level by using the acoustic resonances of the cavity. In the case of the harp, the soundbox and especially the sound holes are primarily

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