Volume 57 Number 3 2009 March
CONTENTS

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PAPERS
Resynthesis of Sound Scenes on Wave-Field Synthesis from Stereo Mixtures Using Sound Source Separation Algorithms (PDF-1.8MB) (HI-RES PDF-3.6MB)  
Maximo Cobos and Jose J. Lopez    91
Because the vast majority of musical recordings are preserved in two-channel stereo format, special upconverters are required in order to use advanced spatial reproduction formats, such as wave-field synthesis. This paper evaluates the subjective quality of synthesized acoustic scenes when using virtual sources that were extracted as separate tracks from stereo mixes. Although wave-field synthesis has its own artifacts, the degradation produced by using separated sources includes timbre modification, burbling sounds, musical noise, and intersource residuals. However, masking effects make these artifacts less perceptible when the entire scene is being reproduced.  

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Auditory Landmarks Enhance Circular Vection in Multimodal Virtual Reality (PDF-1.1MB) (HI-RES PDF-3.0MB)  
Aleksander Väljamäe, Pontus Larsson, Daniel Västfjäll, and Mendel Kleiner    111
The means by which an individual distinguishes between (a) self-movement relative to a fixed external object and (b) a fixed sense of self relative to a moving object involves both sensory input and cognitive processes. The current study examines the cognitive influences of an auditory presentation on the illusion of motion. The illusion of self-motion was strongest when simulating multiple auditory objects of the type that are expected to be immobile: acoustic landmarks. The effect is strongest without visual cues, which can dominate if present. The addition of vibrotactile stimulation of the whole body was only selectively contributing to the experience of being in motion depending on the simulated auditory objects.  

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Design of a Digital Artificial Reverberation System Using a Dual All-Pass Filter (PDF-1.1MB) (HI-RES PDF-2.0MB)  
Dong Hoon Lee, Tae Hoon Kim, and Ju Sung Park    121
All-pass filters have been a central building block in artificial reverberation systems. The authors propose nested and interleaved combinations of such filters as an efficient way to produce reverberation architecture without a correspondingly high compute cost. The resulting dual all-pass filter approach compares favorably to that of embedded all-pass filters.  

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ENGINEERING REPORTS
Designing Low-Frequency Enhanced Loudspeaker Systems Using a Vibration-Absorber Theory (PDF-2.2MB) (HI-RES PDF-18.9MB)  
Mingsain R. Bai, Rong-Liang Chen, and Huan-Sheng Zhang    131
A universal design procedure has been developed for enhancing the low-frequency response of loudspeakers ranging from handset loudspeakers to large subwoofers. The procedure attempts to find the optimal parameters of a vented-box system on the basis of the vibration-absorber theory. Simulations and experiments were used to validate the optimal design. Design charts and constrained optimization facilitate the design of the acoustic enclosure. Although limitations do not allow for accurate prediction of responses below 100 Hz, the comparison between closed- and vented-box performance correlates well with the desired bass extension.  

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STANDARDS AND INFORMATION DOCUMENTS
AES Standards Committee News (PDF-23KB)    149
Audio file interchange; storage of polyester tape; life expectancy of CD-ROM; synchronization of digital audio equipment in studio operations  
 
FEATURES
126th Convention Preview, Munich (PDF-842KB)    150
     Exhibit Previews (PDF-2.5MB)    152
Searching, Analyzing, and Recommending Audio Content (PDF-308KB)    Francis Rumsey    166

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14th Regional Convention, Tokyo, Call for Papers (PDF-33KB)    183
 
DEPARTMENTS
News of the Sections (PDF-184KB)    171
Upcoming Meetings (PDF-24KB)    175
Sound Track (PDF-185KB)    176
Membership Information (PDF-185KB)    176
Advertiser Internet Directory (PDF-131KB)    179
Sections Contacts Directory (PDF-131KB)    184
AES Conventions and Conferences (PDF-98KB)    192
 
EXTRAS
Cover & Sustaining Members List (PDF-81KB)    
AES Officers, Committees, Offices & Journal Staff (PDF-62KB)    
Advertisements (PDF-1.2MB)