Timo Grothe's research works | Hochschule für Musik Detmold, Neustadt and other places

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Figure 1: Deviation of impedance peak frequency fR1 of weakly conical...

A Transfer Matrix for the Input Impedance of weakly tapered Cones as of Wind Instruments

Preprint

Full-text available

Mar 2023

A formula for the local acoustical admittance in a conical waveguide with viscous and thermal losses given by Nederveen in \emph{Acoustical Aspects of Woodwind Instruments} (1969) is rewritten as an impedance transmission matrix. Based on a self-consistent approximation for the cone, it differs from other one-dimensional transmission matrices used...

Experimental study of the effects of the long chimney of a closed tonehole on the sound of a bassoon

Article

Feb 2023

The bassoon has side holes a few tens of millimeters long, much longer than in other woodwinds. When they are closed, the “quarter-wave” resonances of these “chimneys” create short circuits in parallel with the bore. At these resonance frequencies, near 2 kHz—within the sensitive range of hearing—it is expected that the waves will not propagate bey...

Measurement of "Reed to Room" Transfer Functions

Article

Full-text available

Dec 2019

A method is proposed here to synthesize the acoustic response of a room to a musical reed wind instrument with tone holes played by a musician. The procedure uses convolution of a) two measured pulse responses and b) the mouthpiece pressure during playing. The novelty of the approach is to include the sound radiation directivity of the source in th...

Assessment of Bassoon Tuning Quality from Measurements under Playing Conditions

Article

Apr 2015

In reed woodwinds, the pitch of a sound is the result of an interaction between the air column, the reed, and the player. The air column is well described by its resonance frequencies and their damping. The reed is a pressure-controlled valve, which drives a coupled oscillation that settles with a fundamental frequency near a resonance frequency of...

Investigation of bassoon embouchures with an artificial mouth

Article

Apr 2012

Timo GROTHE

Influence of the bocal on the sound of the bassoon

Article

Jun 2008

The bocal of a bassoon is characterized by geometrical parameters such as the bore, the outer contour and the wall-thickness as well as material parameters and the coating. Professional bassoonists select bocals extremely carefully and report influences on the playability and sound colour. In order to understand the underlying effects, several expe...