2001 September, Vol 49 Number 9

CONTENT

PAPERS

Localization of Amplitude-Panned Virtual Sources, Part 1: Stereophonic Panning
Ville Pulkki and Matti Karjalainen   739
Localization of an audio source in the horizontal plane is determined by the interaural level and time differences for the signals arriving at both ears. Experimental results, using an amplitude-panned source rather than a real source, show that the suggested direction depends on the frequency and temporal structure of the signal. Panning at some frequencies produces source spreading because of the inconsistency between cues. Models of directional hearing are used to explain the results.

Localization of Amplitude-Panned Virtual Sources, Part 2: Two- and Three-Dimensional Panning
Ville Pulkki   753
The introduction of nonconventional loudspeaker configurations makes it difficult to extrapolate panning laws from the standard stereo arrangement. Subjects attempted to match the localization of an amplitude- panned virtual source to a real source using loudspeaker triplets. The matching ability was sometimes difficult and inconsistent in the vertical direction. Because this is a relatively new topic with inadequate theoretical models, results are reported qualitatively.

Representing Musical Instrument Sounds for Their Automatic Classification
Bozena Kostek and Andrzej Czyzewski   768
The automatic classification of musical sounds, which is a pattern recognition task, is similar to the problem of audio data compression. Both tasks involve the determination of a signal's nonredundant features. This study explores the spectral and temporal parameters for sounds with the same pitch but with different timbre. Neural networks were then used for training because there are no formal methods to define the relevant parameter vectors or the feature space.

A Reverberation Model Based on Objective Parameters of Subjective Perception
Yang-Hann Kim and Sang-Tae Ahn   786
Models that describe the parametric representation of reverberation have been a controversial subject of discussion for a long time. The authors review the basic relationship between the physical and perceptual basis of the five most common parameters using an energy decay curve rather than an impulse response. The discussions speculate that this is a more useful measure when designing artificial reverberation systems.

STANDARDS AND INFORMATION DOCUMENTS

AES42-2001 AES standard for acoustics - Digital interface for microphones   795
AES Standards Committee News   823
Free downloading; management change; digital libraries; storage and handling; loudspeakers; Internet audio; archival transfers

FEATURES

19th Conference Report, Bavaria, Germany   830
AES 21st International Conference, St. Petersburg, Russia, Call for Papers   851
AES 22nd International Conference, Espoo, Finland, Call for Papers   852

DEPARTMENTS

News of the Sections   838

Sound Track   842

Upcoming Meetings   843

New Products and Developments   843

Available Literature   845

Membership Information   846

Advertiser Internet Directory   847

In Memoriam   850

AES Special Publications   853

Sections Contacts Directory   858

AES Conventions and Conferences   864

FPO For the cover:

2001 September, Vol 49 Number 9

spine: 2001 September, Vol 49 Number 9