Physical differences, such as variations in geometry, between musical wind instruments of a given type generally lead to differences in their resonance properties and, consequently, in their playing characteristics. Input impedance measurements provide information about both the strengths and frequencies of the instrument’s air column resonances. In most playing situations, it is these air colu...

The purpose of this study was to investigate a numerical method for obtaining input impedances of doublereed instruments--the oboe in particular. To this end, the physical dimensions of an oboe were used to compute its input impedance as a function of frequency for several different fingerings. The numerically computed input impendances of the oboe were compared to experimentally measured curve...

Representation of multiwinding transformers by equivalent circuits has been recently improved, and it is for the identification of components of these circuits. In this paper, the focus is on magnetic coupling with its related losses. A general method, based on external impedance measurements, is followed to determine inductances, coupling ratios, and resistances included in these equivalent ci...

The limited usefulness of the maximum power transfer theorem in practice is argued. Inappropriately, the utility and value of the maximum power transfer theorem are often elevated to be religious icons of electrical engineering. While the theorem appears to be useful, often in real circuits the load impedance is not set equal to the complex conjugate of the equivalent impedance of the connectin...

The multi-port network model is a simpler tool to analyze microstrip antennas on thinner substrates. While analyzing modified shaped microstrip antennas, the multi-port network model consists of larger number of segments which increases the complexity of the model. In this paper, first multi-port network models of multi-band and compact modified rectangular microstrip antennas are discussed. Fu...

We have investigated one and two dimensional (1D and 2D) arrays of tunnel junctions in partial Coulomb blockade regime. The absolute accuracy of the Coulomb blockade thermometer is influenced by the external impedance of the array, which is not the same in the different topologies of 1D and 2D arrays. We demonstrate, both by experiment and by theoretical calculations in simple geometries, that ...

Abstract A new configuration for realizing high input impedance voltagemode biquadratic filters with two inputs and one output is presented. The proposed configuration uses two second generation current conveyors (CCII’s) of different polarity, two resistors, and two capacitors. The present configuration is capable of realizing band pass (BP), all pass (AP), and notch filter functions. The circ...

A time-domain simulation model has been developed for investigating the player-clarinet system. The three components that constitute the simulation model consist of the player's air column, reed, and the clarinet. The player's air column is represented in terms of an analogous circuit model to obtain the mouth pressure. The reed is represented as a damped, driven, nonuniform bar. The clarinet i...

This paper presents a new design for an input impedance antenna automatic matching system. In order to achieve this main objective, it is necessary to accomplish several intermediate tasks. On the one hand, a study about the implementation of a generic electronically tunable impedance synthesizer is carried out. Then, a prototype based on the research is constructed, and its characteristics and...