A single microphone capillary-based system for measuring the complex input impedance of musical wind instruments

D.B. Sharp, A. Mamou-Mani, M. Van Walstijn

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)
332 Downloads (Pure)

Abstract

Capillary-based systems for measuring the input impedance of musical wind instruments were first developed in the mid-20th century and remain in widespread use today. In this paper, the basic principles and assumptions underpinning the design of such systems are examined. Inexpensive modifications to a capillary-based impedance measurement set-up made possible due to advances in computing and data acquisition technology are discussed. The modified set-up is able to measure both impedance magnitude and impedance phase even though it only contains one microphone. In addition, a method of calibration is described that results in a significant improvement in accuracy when measuring high impedance objects on the modified capillary-based system. The method involves carrying out calibration measurements on two different objects whose impedances are well-known theoretically. The benefits of performing two calibration measurements (as opposed to the one calibration measurement that has been traditionally used) are demonstrated experimentally through input impedance measurements on two test objects and a Boosey and Hawkes oboe.
Original languageEnglish
Pages (from-to)819-829
Number of pages11
JournalActa Acustica united with Acustica
Volume97
Issue number5
DOIs
Publication statusPublished - 01 Sep 2011

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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