Download Entire Journal (11.0MB)
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| Volume 57 Number 4 | 2009 April |
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CONTENTS Download Entire Journal (11.0MB) |
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| PAPERS | |
| A Study on the Temporal Evolution and Sound-Field Homogeneity in Small Rooms (PDF-652KB) (HI-RES PDF-779KB) | |
| S. J. Loutridis | 195 |
| In order to study the homogeneity of the sound field in relatively small rooms, four different configurations varying in acoustic treatment were tested. Two of the configurations used specially constructed sidewall panels for scattering sound, while the other two used mostly sound-absorbing materials. A homogeneous sound field is best achieved with extensive use of diffusive elements. Room treatment had a stronger influence on the sound field than the position of measurement. | |
| Binaural Sound Source Localization in Real and Virtual Rooms (PDF-1.1MB) (HI-RES PDF-2.1MB) | |
| Monika Rychtáriková, Tim Van den Bogaert, Gerrit Vermeir, and Jan Wouters | 205 |
| A simulated binaural room impulse response was created by convolving a measured head-related transfer function with a hybrid image-source model having stochastic scattering from secondary sources. Listeners using headphones in subjective tests found that measured and simulated room impulse responses had equivalent localization accuracy. This study confirms that the ability to localize sound sources is closely linked to the ratio of direct-to-reverberant energy rather than the reverberation time. | |
| Tonality Estimation and Frequency Tracking of Modulated Tonal Components (PDF-2.0MB) (HI-RES PDF-6.3MB) | |
| Maciej Kulesza and Andrzej Czyzewski | 221 |
| The separation of tonelike and noiselike components within an audio signal is important for many signal processing applications, such as codecs employing a psychoacoustic criterion. Detection of tonal components allows for the creation of tonal tracks, which have specific masking properties. Conventional tonality estimation procedures are not well suited for modulated components that are typically found in music with vibrato and tremolo. In the proposed method, the analysis simultaneously uses a tonality metric based on both historic frames and spectral bins. The results for various metrics are compared. | |
| ENGINEERING REPORTS | |
| Virtualized Listening Tests for Loudspeakers (PDF-1.7MB) (HI-RES PDF-3.0MB) | |
| Timo Hiekkanen, Aki Mäkivirtä, and Matti Karjalainen | 237 |
| When comparing loudspeakers and trying to eliminate the influence of their location, problems arise due to listeners’ short auditory memory. But if a virtual loudspeaker in a virtual room using headphones was equivalent to the real environment, comparison testing would avoid the problem of memory. Switching could be done instantaneously. Subjective tests showed that the quality of virtual loudspeakers depended highly on the test signal and upon the difficulty of creating accurate room- and head-related transfer functions at high frequencies. Nevertheless, virtualized loudspeakers can be imperceptible from reality in many cases. | |
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| STANDARDS AND INFORMATION DOCUMENTS | |
| AES Standards Committee News (PDF-18KB) | 252 |
| Peak flutter; serial Multichannel Audio Digital Interface (MADI); digital audio over ATM networks; loudspeaker polar measurements | |
| FEATURES | |
| 35th Conference Report, London (PDF-3.5MB) | 254 |
| 36th Conference Preview, Dearborn (PDF-636KB) | 262 |
| Calendar (PDF-99KB) | 264 |
| Program (PDF-435KB) | 265 |
| Audio Networking for the Pros (PDF-418KB) Francis Rumsey | 271 |
| DEPARTMENTS | |
| News of the Sections (PDF-296KB) | 276 |
| Upcoming Meetings (PDF-33KB) | 281 |
| Advertiser Internet Directory (PDF-31KB) | 282 |
| Sound Track (PDF-31KB) | 282 |
| New Products and Developments (PDF-22KB) | 283 |
| Membership Information (PDF-57KB) | 284 |
| Sections Contacts Directory (PDF-89KB) | 288 |
| AES Conventions and Conferences (PDF-90KB) | 296 |
| EXTRAS | |
| Cover & Sustaining Members List (PDF-54KB) | |
| AES Officers, Committees, Offices & Journal Staff (PDF-47KB) | |
| Advertisements (PDF-456KB) | |