Journal ArticleDOI
Input impedance curves for the reed woodwind instruments
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TLDR
In this article, the authors developed an automatic method to plot the input impedance curves of reed-excited musical instruments as a function of frequency using a chart-recording system.Abstract:
Equipment has been developed which will automatically plot the input impedance curves of the reed‐excited musical instruments as a function of frequency. Sound from a regulated driver unit is passed through a high acoustical impedance into an adapter unit attached to the mouthpiece of the instrument. This impedance is in the form of a capillary of annular cross section, and is designed to have an approximately constant impedance magnitude over the frequency range used. The sound‐pressure amplitude generated in the instrument is measured by means of a microphone whose output is applied to a chart recorder, so that a graph of input impedance versus frequency is obtained. Representative impedance curves were run for selected notes on the clarinet, oboe, bassoon, and saxophone. Input impedance values range from 400 to 1600 cgs acoustic ohms for the various instruments. For the low notes on the clarinet, the resonance frequencies are compressed in relation to the harmonics of the fundamental mode, the higher r...read more
Citations
More filters
Journal ArticleDOI
Acoustic impedance measurement, part i: a review
TL;DR: In this article, the authors presented linear sensors with two entries whose signals are influenced by both pressure and volume velocity, and classified them according to the way the volume velocity is determined or controlled.
Journal ArticleDOI
The nonlinear physics of musical instruments
TL;DR: In this article, the basic physics of a wide variety of musical instruments and the role of nonlinearity in their operation is investigated, and it is shown that most of these instruments are essentially nonlinear.
Journal ArticleDOI
Improved precision in measurements of acoustic impedance spectra using resonance-free calibration loads and controlled error distribution.
TL;DR: This paper reviews and compares several established techniques, and describes a technique that incorporates three features that considerably improve precision to minimize problems due to resonances by calibrating the instrument using up to three different acoustic reference impedances that do not themselves exhibit resonances.
Dissertation
Acoustic pulse reflectometry for the measurement of musical wind instruments
TL;DR: In this paper, the authors used the time domain technique of acoustic pulse reflectometry to measure the input impulse response of a tubular object, such as a wind instrument, from which both its bore profile and input impedance can be calculated.
Journal ArticleDOI
Acoustics of the avian vocal tract
TL;DR: In this article, the authors presented a theoretical analysis of the avian vocal tract on a source-filter basis, with the pressure-controlled syrinx valve providing the wideband harmonic source and the vocal tract the linear passive filter.