This paper describes an experimental measurement setup for the characterization of single-reed mouthpiece interaction under quasi-static conditions. Measurement leads to estimation nonlinear characteristics, establishing relation between pressure drop across reed channel and jet cross-section. Measurements with various lip forces show that resultant characteristics can be described by a single characteristic linking generalized is sum pressure, defined as force divided equivalent surface...

One of the main fields application personal sound zones (PSZs) is car industry. PSZ systems are usually designed assuming that acoustic environment not changing. However, due to variability in cabin's conditions, it necessary design a system capable adapting these variations. This paper introduces use filtered-x least-mean-squares algorithm adapt cabin when seat positions change. The article focuses on four aspects. First, effect initial coefficients investigated help with convergence...

Using an artificial mouth with accurate pressure control, the onset of oscillations inside mouthpiece a simplified clarinet is studied experimentally. Two time profiles are used for blowing pressure: in first set experiments increased at constant rates, then decreased same rate. In second rises rate and kept arbitrary period time. both cases repeated different increase rates. Numerical simulations using model blown constantly increasing compared to oscillating obtained mouthpiece. Both show...

An approach for the estimation of single reed parameters during playing, using an instrumented mouthpiece and iterative method, is presented. Different physical models describing tip movement are tested in method. The uncertainties sensors installed on limits method studied. A tenor saxophone mounted this connected to a cylinder, played by musician, characterized at different dynamic levels. Results show that can be used estimate with small error low medium sound levels (piano mezzoforte...

A laser Doppler velocimetry bench adapted for measuring acoustic particle velocities is used to measure sinusoidal structural in order assess the performance of two signal processing techniques, one available commercially and other being developed our laboratory. Considering a excitation vibrating structure, both techniques use frequency demodulation approaches extract instantaneous which scattered by object synchronous analysis estimate amplitude phase estimated means demodulation.

An investigation of structural intensity control associated with flexural vibration in beams using strain sensing is presented this paper. The instantaneous completely taken into account the algorithm, i.e., all terms are considered real-time process and, particular, evanescent waves approach. Previous work has shown validity approach an array accelerometers to measure intensity. It purpose paper present results on use A finite difference discrete PVDF sensors provides scheme. feedforward...

The perceived quality of clarinet reeds can be very different from one reed to another, even if they have the same brand, shape and strength.For this reason, there is a strong need for manufacturers better understand their production.Many researchers tried explain these large disparities thanks physical indicators (e.g.mechanical rigidity, modes, displacement in dynamic condition) but without totally explaining quality.Studies on internal structure revealed that wood fibers are not uniformly...

The perceived quality of cane reeds used on saxophones or clarinets may be very different from one reed to another even though the have same shape and strength.The aim this work is better understand differences in by making use acoustical measurements.A perceptual study, involving a panel 10 musicians, was first conducted set 20 strength.Each musician assessed each according three descriptors: Brightness, Softness, Global quality.Second, signal recordings during saxophone playing (saxophone...

This paper presents a rethinking of the Pressure Matching Method (PM) used in generation Personal Sound Zones when responses some filters are already known. They then imposed calculation, resulting Forced method. new formulation is implemented to control two zones—a reproduction zone and dark zone—in two-seat configuration aimed toward Transportation industry. Due variations transportation acoustic environments, computational time added metrics typically literature (such as contrast, effort,...

The standard two microphones technique does not allow the measurement of absorbing materials characteristics at low frequency. Moreover, to cover a range from 100 6000 Hz experiments have be done with different sample diameters. By using sensor known volume velocity source developed by LAUM together CTTM, it is demonstrated that impedance can obtained 10 performing only one single material sample. Results showing behaviour some frequency are presented. On other hand comparison classical...

The subjective quality of cane reeds used on saxophones or clarinets may be very different from one reed to another even though the have same shape and strength. aim this work is understand differences in explain them with objective measurements. A study, involving a panel 10 musicians, was first conducted set 20 Second, signal recordings during saxophone playing (in vivo measurements) were made pressures player’s mouth, mouthpiece at bell instrument. These measurements enable us deduce...