AES Journal

Journal of the AES

2002 March - Volume 50 Number 3


Effect Design, Part 3 Oscillators: Sinusoidal and Pseudonoise (PDF-600K)  
Jon Dattorro    115
This is the third of a three-part series that provides a tutorial reference for those signal processing algorithms that are of particular interest to music. In this part, the issues of low-frequency sinusoidal oscillators and sonically pleasant pseudorandom noise generators are reviewed, compared, and analyzed. Both topics actually have deep issues even though the signal definitions are simple. The historical background, pertinent references, and appendices provide the reader with a comprehensive foundation in these subjects.  

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Reproducing Low-Pitched Signals through Small Loudspeakers (PDF-208K)  
Erik Larsen and Ronald M. Aarts    147
Because small-volume loudspeakers are unable to reproduce low-frequencies, alternative methods can be used to create the illusion of those frequencies by taking advantage of a phantom-pitch phenomenon—the perception of a fundamental when only its harmonics are present. The low frequencies below the loudspeaker cutoff point are extracted from the wide-band signal, nonlinearly processed, filtered again, and finally injected into the path of the main signals. Listeners prefer this artificial bass in comparison to flat reproduction through a small loudspeaker. A particular implementation of phantom pitch is illustrated.  

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Generating Source Streams for Extralinguistic Utterances (PDF-240K)  
Eduardo Reck Miranda    165
Most speech-synthesis systems do not provide a mechanism for creating nonspeechlike signals, such as sounds like boom, meow, gurgles, and genetic vocal noises. To avoid the mechanical-sounding attributes of other approaches, the author adapts a cellular automata control of the spectral parameters. The array of parameters is updated according to a set of rules to create transitions between states using the values of the neighboring cells as input parameters. While this approach works well to create natural sounds, there is insufficient knowledge about how to create an imagined sound.  

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Estimating the Loudspeaker Response when the Vent Output is Delayed (PDF-72K)  
Neville Thiele    173
A method is proposed for estimating the loss in amplitude response for a loudspeaker when the acoustic output from the vent is delayed with respect to the main output. Although the model is simple, it provides insight into the way low-frequency response is influenced by lumped delay to the vent output. Designers are often forced to move the vent to a more distant location, and delay is thereby added to that acoustic path.  

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AES Standards Committee News (PDF-12K)    176
Audio connectors  
112th Convention Preview, Munich (PDF-332K)    178
    Calendar (PDF-332K)    180
    Exhibitors (PDF-296K)    181
    Exhibitor Previews (PDF-2MB)    184
113th Convention, Los Angeles, Call for Workshops Participants (PDF-16K)    206
News of the Sections (PDF-77K)    201
Upcoming Meetings (PDF-14K)    203
Sound Track (PDF-14K)    205
Membership Information (PDF-56K)    207
Advertiser Internet Directory (PDF-56K)    209
In Memoriam (PDF-16K)    212
AES Special Publications (PDF-309K)    213
Sections Contacts Directory (PDF-38K)    218
AES Conventions and Conferences (PDF-44K)    224
Cover and Sustaining Members List (PDF-20K)    
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Editorial Staff (PDF-20K)    
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