| PAPERS | |
| Implementing Asymmetrical Crossovers (PDF-933KB) (HI-RES PDF-11.3MB) | |
| Neville Thiele | 819 |
| Crossover networks for loudspeakers are often designed with symmetrical pairs of transfer functions, but there are applications where the low-pass channel can use filtering of lower order than the high-pass channel, remembering especially that the tweeter's transfer function should be incorporated into the criteria for the crossover design. Two kinds of networks are described, and the advantages and disadvantages of asymmetrical crossovers are discussed. | |
| Ultrahigh-Resolution Audio Formats for Mastering and Archival Applications (PDF-1.8MB) (HI-RES PDF-28.5MB) | |
| M. O. J. Hawksford | 833 |
| With the increasing number of audio data formats available for final release, efficient archival storage of the mastering source material becomes a problem. Ideally, regardless of the initial format, archival storage should not degrade the dynamic range or spectral bandwidth. Several high-resolution strategies are presented as candidates for high-quality archival storage. One candidate, multilevel SDM, achieves the desired goal. An intermediate representation, which can be converted back into any of the standard formats, takes advantage of the lack of energy at very high frequencies. | |
| The Effect of Stereo Crosstalk on Intelligibility: Comparison of a Phantom Stereo Image and a Central Loudspeaker Source (PDF-950KB) (HI-RES PDF-14.0MB) | |
| Ben Shirley, Paul Kendrick, and Claire Churchill | 852 |
| Intelligibility of speech is improved when presented through a real center loudspeaker rather than with a phantom center image from a stereo pair. A two-channel format is less intelligible because the acoustic crosstalk effect produces a dip in the frequency response for mixes that pan the speech to the center. Subjective tests showed a statistically significant increase in word recognition accuracy when presented through a real center loudspeaker. Not only does a center loudspeaker produce better clarity, but it also improves intelligibility. | |
| Ambisonic Synthesis of Complex Sources (PDF-1.0MB) (HI-RES PDF-14.8MB) | |
| Dylan Menzies and Marwan Al-Akaidi | 864 |
| A method for encoding a general acoustic source and transcoding it for a high-order Ambisonic format is presented. Although the approach is more elaborate and costly than plane wave or monopole synthesis, the effort is worthwhile for complex sources in quality rendering systems. For example, localizable sources differ from simple monopoles because of nonzero width and nonuniform directivity patterns. The proposed approach can also represent reverberation. | |
| STANDARDS AND INFORMATION DOCUMENTS | |
| AES Standards Committee News (PDF-227KB) | 877 |
| Audio metadata; loudspeaker modeling and measurement | |
| FEATURES | |
| 31st Conference Report, London (PDF-7.5MB) | 882 |
| Intelligent Audio Environments (PDF-1.7MB) | 889 |
| New Officers 2007/2008 (PDF-127KB) | 896 |
| Review of Society's Sustaining Members (PDF-377KB) | 900 |
| 124th Convention, Amsterdam, Call for Papers (PDF-64KB) | 927 |
| DEPARTMENTS | |
| Reviews of Acoustical Patents (PDF-629KB) | 879 |
| Upcoming Meetings (PDF-60KB) | 899 |
| News of the Sections (PDF-122KB) | 916 |
| New Products and Developments (PDF-221KB) | 919 |
| Membership Information (PDF-112KB) | 920 |
| Advertiser Internet Directory (PDF-73KB) | 921 |
| In Memoriam (PDF-57KB) | 926 |
| Sections Contacts Directory (PDF-167KB) | 928 |
| AES Conventions and Conferences (PDF-139KB) | 936 |
| EXTRAS | |
| Cover & Sustaining Members List (PDF-56KB) | |
| AES Officers, Committees, Offices & Journal Staff (PDF-73KB) | |
