Discrete-time modelling of woodwind instrument bores using wave variables

A method for simulation of acoustical bores, useful in the context of sound synthesis by physical modeling of woodwind instruments, is presented. As with previously developed methods, such as digital waveguide modeling (DWM) [Smith, Comput. Music J. 16, pp 74-91 (1992)] and the multi convolution algorithm (MCA) [Martinez et al., J. Acoust. Soc. Am. 84, pp 1620-1627 (1988)], the approach is based on a one-dimensional model of wave propagation in the bore. Both the DWM method and the MCA explicitly compute the transmission and reflection of wave variables that represent actual traveling pressure waves. The method presented in this report, the wave digital modeling (WDM) method, avoids the typical limitations associated with these methods by using a more general definition of the wave variables. An efficient and spatially modular discrete-time model is constructed from the digital representations of elemental bore units such as cylindrical sections, conical sections, and toneholes. Frequency-dependent phenomena, such as boundary losses, are approximated with digital filters. The stability of a simulation of a complete acoustic bore is investigated empirically. Results of the simulation of a full clarinet show that a very good concordance with classic transmission-line theory is obtained.

The Voice as Transcursive Inscriber: The Relation of Body and Instrument Understood through the Workings of a Machine

This article examines the relationship of the body with a musical instrument; specifically it looks at the vital threshold conditions that occur during the interplay of voice and instrument. By examining the work ‘IKAS’ (1982) for solo saxophone by German composer Hans-Joachim Hespos, the unusual timbral relationships created between vocal and instrumental sounds are exposed. I argue that this particular work highlights the performer/instrument relation as one marked by Gilles Deleuze’s notion of the workings of a machine and a machine’s relation to a ‘flow’, in particular a machine’s function with view to the break in the flow. By turning towards Deleuze’s concept of the machine, this article offers a slightly different vocabulary for music analysis, one that more easily encompasses certain works of the twentieth century, specifically those that are more timbre- than pitch-based.

"The pride of noise": drums and their repercussions in early modern England

This article draws on a wide range of literary and archival sources in order to explore the cultural resonances of drumming in England during the 16th and 17th centuries. It concentrates not on instrument design and playing techniques but on the varied meanings that contemporaries attached to the ubiquitous sound of the drum. The discussion begins and ends with the unmistakable military associations of drumming. In between, consideration is also given to a range of interconnected but sometimes contradictory resonances that appear to have endowed drums with considerable cultural significance. Drums spoke, for example, of authority and they worked hard to impose order in urban streets. They also played their part in the contemporary culture of punishment, and many miscreants were subjected to the humiliation of public percussion. Beyond this, drums were particularly potent in their ability to express masculinity, and female drummers were rare and remarkable. The primal potency of the instrument also rendered it valuable to the insubordinate, and rioters—like soldiers— were regularly called together 'by the drum'. Lastly, the sound of the drum was sometimes intensely festive and could also be used to publicize special events such as dramatic performances and the display of curiosities. The repercussions of drumming were thus varied, and confusion sometimes resulted when the different possibilities became entangled.

Playing with Constraints: Stylistic Variation with a Simple Electronic Instrument

A study was conducted by researchers to address the individuation of performance with electronic instruments. The researchers derived a working concept of style as distinct from structure in an activity, which was proposed as a useful framework for considering virtuosity and individuality in interactions with technology, including musical ones. The researchers proposed an alliance between constraint and the development of style. Another study was described, which explored the emergence of personal performance styles in experienced performers with a novel, constrained electronic musical instrument. The study aimed to represent aspects of a realistic situation within the new interfaces for musical expression (NIME) community where a performer needed to determine how to perform with a new instrument for which there was no established performance practice and instruction manual.

High-precision transit observations of the exoplanet WASP-13b with the RISE instrument

WASP-13b is a sub-Jupiter mass exoplanet orbiting a G1V type star with a period of 4.35 d.The current uncertainty in its impact parameter (0 < b < 0.46) results in poorly definedstellar and planetary radii. To better constrain the impact parameter, we have obtained highprecisiontransit observations with the rapid imager to search for exoplanets (RISE) instrumentmounted on 2.0-m Liverpool Telescope. We present four new transits which are fitted witha Markov chain Monte Carlo routine to derive accurate system parameters. We found anorbital inclination of 85. ◦ 2 ± 0. ◦ 3 resulting in stellar and planetary radii of 1.56 ± 0.04 Rand 1.39 ± 0.05RJup, respectively. This suggests that the host star has evolved off the mainsequence and is in the hydrogen-shell-burning phase.We also discuss how the limb darkeningaffects the derived system parameters.With a density of 0.17ρJ,WASP-13b joins the group oflow-density planets whose radii are too large to be explained by standard irradiation models.We derive a new ephemeris for the system, T0 = 245 5575.5136 ± 0.0016 (HJD) and P =4.353 011 ± 0.000 013 d. The planet equilibrium temperature (Tequ = 1500 K) and the brighthost star (V = 10.4mag) make it a good candidate for follow-up atmospheric studies.