|1998 September, VOLUME 46 NUMBER 9|
Theoretical and Experimental Comparison of Three Methods for Compensation of Electrodynamic Transducer Nonlinearity
Hans Schurer, Cornelis H. Slump, and Otto E. Herrmann 723
Nonlinear compensators for electrodynamic loudspeakers are derived based on a simplified nonlinear model, and are simulated and implemented on a digital signal processor. The model comprises three nonlinearities: suspension-dependent excursion force factors, stiffness, and self-inductance. Three compensation methods are employed to estimate nonlinear parameters from distortion measurements. The results of these approximations are finally compared and evaluated for their overall utility.
Optimization of the Impulse Response Length: Application to Noisy and Highly Reverberant Rooms
Laurent Faiget, Claude Legros, and Robert Ruiz 741
The prediction of speech intelligibility uses early-to-late energy arrival ratios. If the measurement is corrupted by external noise the acquisition time's upper limit of integration cannot be fully realized and a new time limit value is then defined as the useful length of the impulse response. Practical results are shown for three highly reverberant rooms.
The Air and Wood Modes of the Violin
Carleen Maley Hutchins 751
Various violin tone and playing qualities which are based on particular combinations presented by the cavity and body modes are described. The mechanisms underlying the tonal effects of frequency relationships between two strong cavity modes and three important body modes of the violin below 1 kHz are discussed. Differing qualities of practical violin designs are demonstrated for various members of the violin family.
Development and Calibration of a Guitar Synthesizer
Vesa Vlimki and Tero Tolonen 766
Recent digital waveguide techniques are the basis for synthesizing acoustic guitar tones in an efficient implementation. Enhanced analysis methods are used to calibrate the synthesized model, which is based on digitized tones. Separate parametric second-order resonators that run at a lower sampling rate are used to synthesize the guitar body's lowest resonances.
LETTERS TO THE EDITOR
Comments on "Discrete-Element Line Arrays & Their Modeling and Optimization"
Earl R. Geddes 779
STANDARDS AND INFORMATION DOCUMENTS
AES Standards Committee News 780
Call for reaffirmations; digital interfaces, synchronization; audio file formats
15th Conference Preview, Snekkersten, Copenhagen, Denmark 786
Registration Form 794
106th Convention, Munich, Germany, Call for Papers 816
Information for Authors of Convention Papers 816
Review of Acoustical Patents 784
News of the Sections 796
Sound Track 803
Upcoming Meetings 804
New Products and Developments 805
Available Literature 807
In Memoriam 810
Membership Information 811
Audio Engineering Society Membership Application Instructions 819
AES Special Publications 822
Sections Contacts Directory 827
AES Conventions and Conferences 832