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PRESIDENT'S MESSAGE |
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Garry Margolis
(PDF-24K) |
3 |
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PAPERS |
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Fourth-Order Symmetrical Band-Pass Loudspeaker Systems
(PDF-192K) |
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Grzegorz P. Matusiak and Andrzej B. Dobrucki |
4 |
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The analysis of fourth-order band-pass loudspeaker systems based on the
well-known Thiele, Small, and Benson theory is presented using a
reactance transformation method. By comparing the acoustic analog
circuit with the transfer function obtained from the reactance
transformation, the results allow the symmetry condition to be
determined. The resulting system has advantages over closed-box and
vented-box high-pass systems in terms of power and efficiency. |
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Maximizing Performance from Loudspeaker Ports
(PDF-864K) |
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Alex Salvatti, Allan Devantier, and Doug J. Button |
19 |
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The low-frequency performance of a loudspeaker is significantly enhanced
by the use of tapered ports, but there are numerous trade-offs involving
the size of the port and the input and output tapers. Design issues
include the effectiveness of heat transfer, amount of turbulence
created, air velocity, smoothness of the taper, symmetry of the two
tapers, effective mass in the port, and the contribution to the
frequency response. Suggested design rules are based on extensive
empirical studies. |
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ENGINEERING REPORTS |
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Wavetable Matching of Inharmonic String Tones
(PDF-192K) |
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Clifford So and Andrew B. Horner |
46 |
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A new wavetable matching technique for inharmonic music tones, such as a
violin with vibrato, shows good spectral matching and adequate frequency
resolution. Confirmation with listening tests significantly improves the
perceived matching but degrades performance on harmonic trumpet tones
compared to simple wavetable matching. The new method offers more than a
three-fold improvement over additive synthesis for these cases, but for
harmonic tones the original matching technique should be used. |
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Localization of Virtual Sound as a Function of Head-Related Impulse Response Duration
(PDF-104K) |
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Melis A. Senova, Ken I. McAnally, and Russell L. Martin |
57 |
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The localization accuracy of subjects using headphones was determined as
a function of the duration of the head-related impulse response. Unlike
previous studies, there was a gradual decrease in accuracy starting at
10 ms and becoming drastically worse at about 0.5 ms. Durations of more
than 10 ms result in performance indistinguishable from free-field
localization. Shorter durations are equivalent to smoothing the
frequency response and thereby removing the fine detail unique to each
subject's own ears. |
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CORRECTIONS |
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Correction to "Multitone Testing of Sound System Components-Some Results and
Conclusions, Part 1: History and Theory"
(PDF-104K) |
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Eugene Czerwinski, Alexander Voishvillo, Sergei Alexandrov, and Alexander Terekhov |
66 |
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STANDARDS AND INFORMATION DOCUMENTS |
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AES Standards Committee News
(PDF-104K) |
67 |
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ATM networking; acoustics measurement; EMC; IEEE1394 networks;
network and file transfer |
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Call for Comment on DRAFT AES47-xxxx, DRAFT AES standard on digital
audio digital input-output interfacing transmission of digital audio
over asynchronous transfer mode (ATM) networks |
67 |
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Call for Comment on REAFFIRMATION of AES18-1996, AES recommended
practice for digital audio engineering - Format for the user data
channel of the AES digital audio interface |
67 |
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Call for Comment on REAFFIRMATION of AES20-1996, AES recommended
practice for professional audio - Subjective evaluation of
loudspeakers |
68 |
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Call for Comment on REAFFIRMATION of AES27-1996, AES recommended
practice for forensic purposes - Managing recorded audio materials
intended for examination |
68 |
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Call for Comment on WITHDRAWAL of AES15-1991, AES recommended practice
for sound-reinforcement systems - Communications interface
(PA-422) |
68 |
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FEATURES |
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Audible Alarms for the Hearing Impaired John Vanderkooy
(PDF-272K) |
73 |
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Education News
(PDF-46K) |
81 |
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113th Convention, Los Angeles, Call for Papers
(PDF-16K) |
100 |
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DEPARTMENTS |
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News of the Sections
(PDF-129K) |
82 |
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Upcoming Meetings
(PDF-129K) |
87 |
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Sound Track
(PDF-30K) |
88 |
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New Products and Developments
(PDF-48K) |
90 |
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Available Literature
(PDF-13K) |
92 |
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Membership Information
(PDF-80K) |
93 |
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Advertiser Internet Directory
(PDF-80K) |
97 |
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In Memoriam
(PDF-81K) |
98 |
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AES Special Publications
(PDF-88K) |
101 |
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Sections Contacts Directory
(PDF-38K) |
106 |
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AES Conventions and Conferences
(PDF-44K) |
112 |
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EXTRAS |
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Cover and Sustaining Members List
(PDF-20K) |
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VIP List
(PDF-36K) |
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Editorial Staff
(PDF-20K) |
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Ads In This Issue
(PDF-36K,
PDF-2.7MB) |
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Download Entire Journal As One PDF
(PDF-2.7MB) |
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