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Perceptual Effects of Dynamic Range Compression in Popular Music Recordings - January 2014
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Accurate Calculation of Radiation and Diffraction from Loudspeaker Enclosures at Low Frequency - June 2013
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New Measurement Techniques for Portable Listening Devices: Technical Report - October 2013
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Journal of the AES


2008 July/August - Volume 56 Number 7/8

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Papers

Editor's Note (PDF-50KB)                            John Vanderkooy    531
 
PAPERS
Concert Hall Acoustics—2008 (PDF-1.6MB) (HI-RES PDF-23.6MB)  
Leo L. Beranek    532
A comprehensive review of concert hall acoustics shows a clear relationship between measurements and perceived quality among listeners, conductors, and musicians. While the basic Sabine and Eyring equations are still important for determining reverberation times, there are other measures that are also important. These include rise and decay of sound energy, early decay at mid-frequencies, lateral fraction, binaural quality index, perceived loudness, listener envelopment, and others. These measures must be connected to the subjective ratings of concert halls that have been accumulated over the years. The principles are illustrated with case studies that compare the shoebox shape to the surround design.  
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Noncontact Surface Metrology for Preservation and Sound Recovery from Mechanical Sound Recordings (PDF-2.0MB) (HI-RES PDF-39.8MB)  
P. J. Boltryk, J. W. McBride, M. Hill, A. J. Nascè, Z. Zhao, and C. Maul    545
Decoding historic mechanical recordings using noncontact optical methods avoids further degradation that would be created with a stylus. Moreover, for recordings that have been damaged, contact methods do not work. The proposed method, which is based on surface metrology of engineering surfaces, measures the surface optically, while offline signal processing then recovers the audio information. The surface record, preserved as a high-resolution matrix grid, is retained indefinitely. Preliminary results indicate better noise and distortion performance compared to mechanical playback.  
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Automatic Musical Genre Classification Using a Flexible Approach (PDF-336KB) (HI-RES PDF-4.0MB)  
Jayme Garcia Arnal Barbedo and Amauri Lopes    560
An automated method for classifying music signals into genres is proposed. Up to three genres are assigned to each example along with a measure of the degree of influence. The method is based on a structure formed by taxonomy of four hierarchical layers, with 29 genres in the lowest layer and 10 target genres in the higher layers. In more than 77% of the cases there was successful classification. The computational effort is sufficiently low that this method could be used in real time.  
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Modeling Frequency-Dependent Boundaries as Digital Impedance Filters in FDTD and K-DWM Room Acoustics Simulations (PDF-605KB) (HI-RES PDF-4.1MB)  
Konrad Kowalczyk and Maarten van Walstijn    569
A novel method for modeling frequency-dependent boundaries in finite-difference time-domain (FDTD) room acoustic simulations offers a significant improvement over the conventional one-dimensional approach. The method incorporates a digital impedance filter resulting in multidimensional formulation. Reflecting sound waves approximate the theoretical reflectance for any value of wall impedance and angle of incidence, especially at low frequencies. Both phase and amplitude are preserved. Results obtained from numerical experiments confirm the validity of the approach.  
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STANDARDS AND INFORMATION DOCUMENTS
AES Standards Committee News (PDF-2.6MB)    585
Digital audio measurements; digital input/output interfacing; audio-file transfer and exchange; audio applications of networks  
 
FEATURES
124th Convention Report, Amsterdam (PDF-5.8MB)    590
     Exhibitors (PDF-768KB)    607
     124th Program (PDF-332KB)    
125th Convention Preview, San Francisco (PDF-398KB)    610
     Exhibit Previews (PDF-1.5MB)    612
Signal Processing for 3-D Audio (PDF-789KB)    Francis Rumsey    640
Education News (PDF-115KB)    646
35th Conference, London, Call for Papers (PDF-45KB)    654
36th Conference, Dearborn, Call for Papers (PDF-44KB)    655
 
DEPARTMENTS
News of the Sections (PDF-122KB)    648
Sound Track (PDF-286KB)    650
Membership Information (PDF-79KB)    652
Upcoming Meetings (PDF-58KB)    653
Advertiser Internet Directory (PDF-58KB)    653
Sections Contacts Directory (PDF-180KB)    656
AES Conventions and Conferences (PDF-130KB)    664
 
EXTRAS
Cover & Sustaining Members List (PDF-75KB)    
AES Officers, Committees, Offices & Journal Staff (PDF-78KB)    
Advertisements (PDF-1.4MB)    
Convention Papers Insert (PDF-90KB)    
 
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