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Journal of the AES


2003 October - Volume 51 Number 10

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Papers

PAPERS
Two-Port Representation of the Connection between Horn Driver and Horn (PDF-1.4MB)  
Gottfried K. Behler and Michael Makarski    883
Analyzing a loudspeaker system comprised of a horn and a horn driver is more productive if each element is modeled with an approach that is appropriate to the underlying physics. The driver element approximates a classical two port, with electrical voltage and current at the input port and acoustic pressure and velocity at the output port. In contrast, the horn element incorporates a three-dimensional sound radiation pattern with a one-dimensional acoustic input. The model of each element was merged at the connection point to predict the performance of the system's combination.  
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ENGINEERING REPORTS
Sensitivity of High-Order Loudspeaker Crossover Networks with All-Pass Response (PDF-260K)  
Brandon Cochenour, Carlos Chai, and David A. Rich    898
While component tolerances influence the properties of loudspeaker crossover networks and these influences are greatest in high-order filters, the advantages of high-order networks dwarf other issues. Specifically as a listener changes his elevation, the shift in delay among noncoincident drivers dominates the frequency response. High-order filters limit this influence to a narrow-frequency region. Monte Carlo simulations confirmed that the component tolerances, in comparison to delay changes, are a minor aspect of the response.  
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Wavefront Sculpture Technology (PDF-440K)  
Marcel Urban, Christian Heil, and Paul Bauman    912
Arrays of discrete loudspeakers are useful for creating a controlled sound field over a wide area, but mathematical and numeric methods often do not provide intuitive insight into the physical process. Using the visual analog of a Fresnel analysis, the authors considered a qualitative approach to the design of loudspeaker arrays to show how interference can be controlled. When this approach was applied to a curved array, the added degree of freedom enabled a wave field to be created that is free of destructive interference over a larger predefined area.  
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Acoustical Renovation of Tainan Municipal Cultural Center Auditorium (PDF-952K)  
Weihwa Chiang, Chingtsung Hwang, and Yenkun Hsu    933
The Tainan auditorium had a reputation for good acoustics, but its reverberation time and spatial acoustics were inadequate for orchestra performances. Because the ceiling had been damaged, the renovation project also offered an opportunity to modify the acoustics. Scale models of the proposed changes were used to compare the conditions before and after the renovation. Simple modifications of the space produced dramatic improvements.  
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FEATURES
24th Conference Report, Banff (PDF-2.0MB)    946
Advances in Low Bit-Rate Audio Coding (PDF-1.4MB)    956
Review of Society's Sustaining Members (PDF-742K)    965
Updates and Corrections to the 2002/2003 International Sections Directory (PDF-18K)    983
 
DEPARTMENTS
Review of Acoustical Patents (PDF-128K)    943
News of the Sections (PDF-40K)    985
Sound Track (PDF-13K)    988
Upcoming Meetings (PDF-13K)    988
New Products and Developments (PDF-240K)    989
Advertiser Internet Directory (PDF-118K)    991
Available Literature (PDF-20K)    992
Membership Information (PDF-25K)    993
AES Special Publications (PDF-80K)    997
Sections Contacts Directory (PDF-33K)    1002
AES Conventions and Conferences (PDF-42K)    1008
 
EXTRAS
Cover & Sustaining Members List (PDF-33K)    
VIP List & Editorial Staff (PDF-37K)    
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